DataSet.ReadXml 方法

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::Xml::XmlReader ^ reader, System::Data::XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader? reader, System.Data.XmlReadMode mode);

public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader? reader, System.Data.XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader? reader, System.Data.XmlReadMode mode);

public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader reader, System.Data.XmlReadMode mode);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.Xml.XmlReader * System.Data.XmlReadMode -> System.Data.XmlReadMode

member this.ReadXml : System.Xml.XmlReader * System.Data.XmlReadMode -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.Xml.XmlReader * System.Data.XmlReadMode -> System.Data.XmlReadMode

Public Function ReadXml (reader As XmlReader, mode As XmlReadMode) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

請注意，與WriteXml方法分別也是WriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML 架構包含 targetNamespace，資料可能無法讀取，且在 ReadXml 呼叫載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請將您的 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

另請參閱

• 使用 ADO.NET

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::String ^ fileName, System::Data::XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(string fileName, System.Data.XmlReadMode mode);

public System.Data.XmlReadMode ReadXml(string fileName, System.Data.XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(string fileName, System.Data.XmlReadMode mode);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : string * System.Data.XmlReadMode -> System.Data.XmlReadMode

member this.ReadXml : string * System.Data.XmlReadMode -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : string * System.Data.XmlReadMode -> System.Data.XmlReadMode

Public Function ReadXml (fileName As String, mode As XmlReadMode) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

例外狀況

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

請注意，與WriteXml方法分別也是WriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML 架構包含 targetNamespace，資料可能無法讀取，且在 ReadXml 呼叫載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請將您的 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

另請參閱

• 使用 ADO.NET

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::IO::Stream ^ stream, System::Data::XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.Stream? stream, System.Data.XmlReadMode mode);

public System.Data.XmlReadMode ReadXml(System.IO.Stream? stream, System.Data.XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.Stream? stream, System.Data.XmlReadMode mode);

public System.Data.XmlReadMode ReadXml(System.IO.Stream stream, System.Data.XmlReadMode mode);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.Stream * System.Data.XmlReadMode -> System.Data.XmlReadMode

member this.ReadXml : System.IO.Stream * System.Data.XmlReadMode -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.Stream * System.Data.XmlReadMode -> System.Data.XmlReadMode

Public Function ReadXml (stream As Stream, mode As XmlReadMode) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

與方法分別也是WriteXmlWriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML Schema 包含 targetNamespace，資料可能無法讀取，且在呼叫 ReadXml 載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請將您的 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

另請參閱

• 使用 ADO.NET

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::IO::TextReader ^ reader, System::Data::XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.TextReader? reader, System.Data.XmlReadMode mode);

public System.Data.XmlReadMode ReadXml(System.IO.TextReader? reader, System.Data.XmlReadMode mode);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.TextReader? reader, System.Data.XmlReadMode mode);

public System.Data.XmlReadMode ReadXml(System.IO.TextReader reader, System.Data.XmlReadMode mode);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.TextReader * System.Data.XmlReadMode -> System.Data.XmlReadMode

member this.ReadXml : System.IO.TextReader * System.Data.XmlReadMode -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.TextReader * System.Data.XmlReadMode -> System.Data.XmlReadMode

Public Function ReadXml (reader As TextReader, mode As XmlReadMode) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

請注意，與WriteXml方法分別也是WriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML Schema 包含 targetNamespace，資料可能無法讀取，且在呼叫 ReadXml 載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請將您的 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

另請參閱

• 使用 ADO.NET

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::String ^ fileName);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(string fileName);

public System.Data.XmlReadMode ReadXml(string fileName);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(string fileName);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : string -> System.Data.XmlReadMode

member this.ReadXml : string -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : string -> System.Data.XmlReadMode

Public Function ReadXml (fileName As String) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

例外狀況

範例

以下範例首先建立一個包含一DataSet、兩欄和十列的簡單體DataTable。 DataSet結構與資料透過呼叫WriteXml該方法寫入磁碟。 建立第二個 DataSet ，並用該 ReadXml 方法填充結構與資料。

private void DemonstrateReadWriteXMLDocumentWithStreamReader()
{
    // Create a DataSet with one table and two columns.
    DataSet OriginalDataSet = new DataSet("dataSet");
    OriginalDataSet.Namespace= "NetFrameWork";
    DataTable table = new DataTable("table");
    DataColumn idColumn = new DataColumn("id",
        Type.GetType("System.Int32"));
    idColumn.AutoIncrement= true;

    DataColumn itemColumn = new DataColumn("item");
    table.Columns.Add(idColumn);
    table.Columns.Add(itemColumn);
    OriginalDataSet.Tables.Add(table);

    // Add ten rows.
    DataRow newRow;
    for(int i = 0; i < 10; i++)
    {
        newRow = table.NewRow();
        newRow["item"]= "item " + i;
        table.Rows.Add(newRow);
    }
    OriginalDataSet.AcceptChanges();

    // Print out values of each table in the DataSet
    // using the function defined below.
    PrintValues(OriginalDataSet, "Original DataSet");

    // Write the schema and data to an XML file.
    string xmlFilename = "XmlDocument.xml";

    // Use WriteXml to write the document.
    OriginalDataSet.WriteXml(xmlFilename);

    // Dispose of the original DataSet.
    OriginalDataSet.Dispose();

    // Create a new DataSet.
    DataSet newDataSet = new DataSet("New DataSet");

    // Read the XML document into the DataSet.
    newDataSet.ReadXml(xmlFilename);

    // Print out values of each table in the DataSet
    // using the function defined below.
    PrintValues(newDataSet,"New DataSet");
}

private void PrintValues(DataSet dataSet, string label)
{
    Console.WriteLine("\n" + label);
    foreach(DataTable table in dataSet.Tables)
    {
        Console.WriteLine("TableName: " + table.TableName);
        foreach(DataRow row in table.Rows)
        {
            foreach(DataColumn column in table.Columns)
            {
                Console.Write("\table " + row[column] );
            }
            Console.WriteLine();
        }
    }
}

Private Sub DemonstrateReadWriteXMLDocumentWithStreamReader()
    ' Create a DataSet with one table and two columns.
    Dim OriginalDataSet As New DataSet("dataSet")
    OriginalDataSet.Namespace = "NetFrameWork"
    Dim table As New DataTable("table")
    Dim idColumn As New DataColumn("id", _
        Type.GetType("System.Int32"))
    idColumn.AutoIncrement = True

    Dim itemColumn As New DataColumn("item")
    table.Columns.Add(idColumn)
    table.Columns.Add(itemColumn)
    OriginalDataSet.Tables.Add(table)

    ' Add ten rows.
    Dim newRow As DataRow
    Dim i As Integer
    For i = 0 To 9
        newRow = table.NewRow()
        newRow("item") = "item " & i.ToString()
        table.Rows.Add(newRow)
    Next i
    OriginalDataSet.AcceptChanges()

    ' Print out values of each table in the DataSet 
    ' using the function defined below.
    PrintValues(OriginalDataSet, "Original DataSet")

    ' Write the schema and data to an XML file.
    Dim xmlFilename As String = "XmlDocument.xml"

    ' Use WriteXml to write the document.
    OriginalDataSet.WriteXml(xmlFilename)

    ' Dispose of the original DataSet.
    OriginalDataSet.Dispose()

    ' Create a new DataSet.
    Dim newDataSet As New DataSet("New DataSet")

    ' Read the XML document into the DataSet.
    newDataSet.ReadXml(xmlFilename)

    ' Print out values of each table in the DataSet 
    ' using the function defined below.
    PrintValues(newDataSet, "New DataSet")
End Sub
    
Private Sub PrintValues(dataSet As DataSet, label As String)
    Console.WriteLine(ControlChars.Cr & label)
    Dim table As DataTable
    For Each table In  dataSet.Tables
        Console.WriteLine("TableName: " & table.TableName)
        Dim row As DataRow
        For Each row In  table.Rows
            Dim column As DataColumn
            For Each column In  table.Columns
                Console.Write(ControlChars.Tab & " " & _
                    row(column).ToString())
            Next column
            Console.WriteLine()
        Next row
    Next table
End Sub

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

請注意，與WriteXml方法分別也是WriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML 架構包含 targetNamespace，資料可能無法讀取，且在 ReadXml 呼叫載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請將您的 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

另請參閱

• 使用 ADO.NET

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::IO::TextReader ^ reader);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.TextReader? reader);

public System.Data.XmlReadMode ReadXml(System.IO.TextReader? reader);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.TextReader? reader);

public System.Data.XmlReadMode ReadXml(System.IO.TextReader reader);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.TextReader -> System.Data.XmlReadMode

member this.ReadXml : System.IO.TextReader -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.TextReader -> System.Data.XmlReadMode

Public Function ReadXml (reader As TextReader) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

範例

以下範例首先建立一個包含一DataSet、兩欄和十列的簡單體DataTable。 DataSet結構與資料透過呼叫WriteXml該方法寫入磁碟。 建立第二個 DataSet ，並用該 ReadXml 方法填充結構與資料。

private void DemonstrateReadWriteXMLDocumentWithFileStream()
{
    // Create a DataSet with one table and two columns.
    DataSet originalDataSet = new DataSet("dataSet");
    DataTable table = new DataTable("table");
    DataColumn idColumn = new DataColumn("id",
        Type.GetType("System.Int32"));
    idColumn.AutoIncrement= true;

    DataColumn itemColumn = new DataColumn("item");
    table.Columns.Add(idColumn);
    table.Columns.Add(itemColumn);
    originalDataSet.Tables.Add(table);
    // Add ten rows.

    DataRow newRow;
    for(int i = 0; i < 10; i++)
    {
        newRow = table.NewRow();
        newRow["item"]= "item " + i;
        table.Rows.Add(newRow);
    }
    originalDataSet.AcceptChanges();

    // Print out values of each table in the DataSet
    // using the function defined below.
    PrintValues(originalDataSet, "Original DataSet");

    // Write the schema and data to XML file with FileStream.
    string xmlFilename = "XmlDocument.xml";
    System.IO.FileStream streamWrite = new System.IO.FileStream
        (xmlFilename, System.IO.FileMode.Create);

    // Use WriteXml to write the XML document.
    originalDataSet.WriteXml(streamWrite);

    // Close the FileStream.
    streamWrite.Close();

    // Dispose of the original DataSet.
    originalDataSet.Dispose();
    // Create a new DataSet.
    DataSet newDataSet = new DataSet("New DataSet");

    // Read the XML document back in.
    // Create new FileStream to read schema with.
    System.IO.FileStream streamRead = new System.IO.FileStream
        (xmlFilename,System.IO.FileMode.Open);
    newDataSet.ReadXml(streamRead);

    // Print out values of each table in the DataSet
    // using the function defined below.
    PrintValues(newDataSet,"New DataSet");
}

private void PrintValues(DataSet dataSet, string label)
{
    Console.WriteLine("\n" + label);
    foreach(DataTable table in dataSet.Tables)
    {
        Console.WriteLine("TableName: " + table.TableName);
        foreach(DataRow row in table.Rows)
        {
            foreach(DataColumn column in table.Columns)
            {
                Console.Write("\table " + row[column] );
            }
            Console.WriteLine();
        }
    }
}

Private Sub DemonstrateReadWriteXMLDocumentWithFileStream()
    ' Create a DataSet with one table and two columns.
    Dim originalDataSet As New DataSet("dataSet")
    Dim table As New DataTable("table")
    Dim idColumn As New DataColumn("id", _
       Type.GetType("System.Int32"))
    idColumn.AutoIncrement = True

    Dim itemColumn As New DataColumn("item")
    table.Columns.Add(idColumn)
    table.Columns.Add(itemColumn)
    originalDataSet.Tables.Add(table)

    ' Add ten rows.
    Dim newRow As DataRow
    Dim i As Integer
    For i = 0 To 9
        newRow = table.NewRow()
        newRow("item") = "item " & i.ToString()
        table.Rows.Add(newRow)
    Next i
    originalDataSet.AcceptChanges()

    ' Print out values of each table in the DataSet 
    ' using the function defined below.
    PrintValues(originalDataSet, "Original DataSet")

    ' Write the schema and data to XML file with FileStream.
    Dim xmlFilename As String = "XmlDocument.xml"
    Dim streamWrite As New System.IO.FileStream _
       (xmlFilename, System.IO.FileMode.Create)

    ' Use WriteXml to write the XML document.
    originalDataSet.WriteXml(streamWrite)

    ' Close the FileStream.
    streamWrite.Close()
     
    ' Dispose of the original DataSet.
    originalDataSet.Dispose()
    ' Create a new DataSet.
    Dim newDataSet As New DataSet("New DataSet")
       
    ' Read the XML document back in. 
    ' Create new FileStream to read schema with.
    Dim streamRead As New System.IO.FileStream _
       (xmlFilename, System.IO.FileMode.Open)
     
    newDataSet.ReadXml(streamRead)
    ' Print out values of each table in the DataSet  
    ' using the function defined below.
    PrintValues(newDataSet, "New DataSet")
End Sub
   
Private Sub PrintValues(dataSet As DataSet, label As String)
    Console.WriteLine(ControlChars.Cr & label)
    Dim table As DataTable
    Dim row As DataRow
    Dim column As DataColumn
    For Each table In  dataSet.Tables
        Console.WriteLine("TableName: " & table.TableName)         
        For Each row In  table.Rows             
            For Each column In  table.Columns
                Console.Write(ControlChars.Tab & " " & _
                   row(column).ToString())
            Next column
            Console.WriteLine()
        Next row
    Next table
End Sub

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

請注意，與WriteXml方法分別也是WriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML Schema 包含 targetNamespace，資料可能無法讀取，且在呼叫 ReadXml 載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請將您的 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

繼承自該 TextReader 類別的類別包括 和 StreamReaderStringReader 類別。

另請參閱

• 使用 ADO.NET

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::IO::Stream ^ stream);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.Stream? stream);

public System.Data.XmlReadMode ReadXml(System.IO.Stream? stream);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.IO.Stream? stream);

public System.Data.XmlReadMode ReadXml(System.IO.Stream stream);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.Stream -> System.Data.XmlReadMode

member this.ReadXml : System.IO.Stream -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.IO.Stream -> System.Data.XmlReadMode

Public Function ReadXml (stream As Stream) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

範例

以下範例首先建立一個包含一DataSet、兩欄和十列的簡單體DataTable。 DataSet結構與資料透過呼叫WriteXml該方法寫入磁碟。 建立第二個 DataSet ，並用該 ReadXml 方法填充結構與資料。

private void DemonstrateReadWriteXMLDocumentWithFileStream()
{
    // Create a DataSet with one table and two columns.
    DataSet originalDataSet = new DataSet("dataSet");
    DataTable table = new DataTable("table");
    DataColumn idColumn = new DataColumn("id",
        Type.GetType("System.Int32"));
    idColumn.AutoIncrement= true;

    DataColumn itemColumn = new DataColumn("item");
    table.Columns.Add(idColumn);
    table.Columns.Add(itemColumn);
    originalDataSet.Tables.Add(table);
    // Add ten rows.

    DataRow newRow;
    for(int i = 0; i < 10; i++)
    {
        newRow = table.NewRow();
        newRow["item"]= "item " + i;
        table.Rows.Add(newRow);
    }
    originalDataSet.AcceptChanges();

    // Print out values of each table in the DataSet
    // using the function defined below.
    PrintValues(originalDataSet, "Original DataSet");

    // Write the schema and data to XML file with FileStream.
    string xmlFilename = "XmlDocument.xml";
    System.IO.FileStream streamWrite = new System.IO.FileStream
        (xmlFilename, System.IO.FileMode.Create);

    // Use WriteXml to write the XML document.
    originalDataSet.WriteXml(streamWrite);

    // Close the FileStream.
    streamWrite.Close();

    // Dispose of the original DataSet.
    originalDataSet.Dispose();
    // Create a new DataSet.
    DataSet newDataSet = new DataSet("New DataSet");

    // Read the XML document back in.
    // Create new FileStream to read schema with.
    System.IO.FileStream streamRead = new System.IO.FileStream
        (xmlFilename,System.IO.FileMode.Open);
    newDataSet.ReadXml(streamRead);

    // Print out values of each table in the DataSet
    // using the function defined below.
    PrintValues(newDataSet,"New DataSet");
}

private void PrintValues(DataSet dataSet, string label)
{
    Console.WriteLine("\n" + label);
    foreach(DataTable table in dataSet.Tables)
    {
        Console.WriteLine("TableName: " + table.TableName);
        foreach(DataRow row in table.Rows)
        {
            foreach(DataColumn column in table.Columns)
            {
                Console.Write("\table " + row[column] );
            }
            Console.WriteLine();
        }
    }
}

Private Sub DemonstrateReadWriteXMLDocumentWithFileStream()
    ' Create a DataSet with one table and two columns.
    Dim originalDataSet As New DataSet("dataSet")
    Dim table As New DataTable("table")
    Dim idColumn As New DataColumn("id", _
       Type.GetType("System.Int32"))
    idColumn.AutoIncrement = True

    Dim itemColumn As New DataColumn("item")
    table.Columns.Add(idColumn)
    table.Columns.Add(itemColumn)
    originalDataSet.Tables.Add(table)

    ' Add ten rows.
    Dim newRow As DataRow
    Dim i As Integer
    For i = 0 To 9
        newRow = table.NewRow()
        newRow("item") = "item " & i.ToString()
        table.Rows.Add(newRow)
    Next i
    originalDataSet.AcceptChanges()

    ' Print out values of each table in the DataSet 
    ' using the function defined below.
    PrintValues(originalDataSet, "Original DataSet")

    ' Write the schema and data to XML file with FileStream.
    Dim xmlFilename As String = "XmlDocument.xml"
    Dim streamWrite As New System.IO.FileStream _
       (xmlFilename, System.IO.FileMode.Create)

    ' Use WriteXml to write the XML document.
    originalDataSet.WriteXml(streamWrite)

    ' Close the FileStream.
    streamWrite.Close()
     
    ' Dispose of the original DataSet.
    originalDataSet.Dispose()
    ' Create a new DataSet.
    Dim newDataSet As New DataSet("New DataSet")
       
    ' Read the XML document back in. 
    ' Create new FileStream to read schema with.
    Dim streamRead As New System.IO.FileStream _
       (xmlFilename, System.IO.FileMode.Open)
     
    newDataSet.ReadXml(streamRead)
    ' Print out values of each table in the DataSet  
    ' using the function defined below.
    PrintValues(newDataSet, "New DataSet")
End Sub
   
Private Sub PrintValues(dataSet As DataSet, label As String)
    Console.WriteLine(ControlChars.Cr & label)
    Dim table As DataTable
    Dim row As DataRow
    Dim column As DataColumn
    For Each table In  dataSet.Tables
        Console.WriteLine("TableName: " & table.TableName)         
        For Each row In  table.Rows             
            For Each column In  table.Columns
                Console.Write(ControlChars.Tab & " " & _
                   row(column).ToString())
            Next column
            Console.WriteLine()
        Next row
    Next table
End Sub

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

請注意，與WriteXml方法分別也是WriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML Schema 包含 targetNamespace，資料可能無法讀取，且在呼叫 ReadXml 載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請在 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

另請參閱

• ReadXmlSchema(XmlReader)
• WriteXml(Stream)
• WriteXmlSchema(Stream)
• 使用 ADO.NET

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

來源:

DataSet.cs

public:
 System::Data::XmlReadMode ReadXml(System::Xml::XmlReader ^ reader);

[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")]
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader? reader);

public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader? reader);

[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")]
public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader? reader);

public System.Data.XmlReadMode ReadXml(System.Xml.XmlReader reader);

[<System.Diagnostics.CodeAnalysis.RequiresDynamicCode("Members from serialized types may use dynamic code generation.")>]
[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.Xml.XmlReader -> System.Data.XmlReadMode

member this.ReadXml : System.Xml.XmlReader -> System.Data.XmlReadMode

[<System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("Members from serialized types may be trimmed if not referenced directly.")>]
member this.ReadXml : System.Xml.XmlReader -> System.Data.XmlReadMode

Public Function ReadXml (reader As XmlReader) As XmlReadMode

參數

傳回

他們 XmlReadMode 會讀取資料。

屬性

RequiresDynamicCodeAttribute RequiresUnreferencedCodeAttribute

範例

以下範例首先建立一個包含一DataSet、兩欄和十列的簡單體DataTable。 DataSet結構與資料透過呼叫WriteXml該方法寫入磁碟。 建立第二個 DataSet ，並用該 ReadXml 方法填充結構與資料。

private void DemonstrateReadWriteXMLDocumentWithXMLReader()
{
    // Create a DataSet with one table and two columns.
    DataSet OriginalDataSet = new DataSet("dataSet");
    OriginalDataSet.Namespace= "NetFrameWork";
    DataTable table = new DataTable("table");
    DataColumn idColumn = new DataColumn("id",
        Type.GetType("System.Int32"));
    idColumn.AutoIncrement= true;

    DataColumn itemColumn = new DataColumn("item");
    table.Columns.Add(idColumn);
    table.Columns.Add(itemColumn);
    OriginalDataSet.Tables.Add(table);

    // Add ten rows.
    DataRow newRow;
    for(int i = 0; i < 10; i++)
    {
        newRow = table.NewRow();
        newRow["item"]= "item " + i;
        table.Rows.Add(newRow);
    }
    OriginalDataSet.AcceptChanges();

    // Print out values of each table in the DataSet
    // using the function defined below.
    PrintValues(OriginalDataSet, "Original DataSet");

    // Write the XML schema and data to file with FileStream.
    string xmlFilename = "XmlDocument.xml";

    // Create FileStream
    System.IO.FileStream fsWriteXml =
        new System.IO.FileStream
        (xmlFilename, System.IO.FileMode.Create);

    // Create an XmlTextWriter to write the file.
    System.Xml.XmlTextWriter xmlWriter =
        new System.Xml.XmlTextWriter
        (fsWriteXml, System.Text.Encoding.Unicode);

    // Use WriteXml to write the document.
    OriginalDataSet.WriteXml(xmlWriter, XmlWriteMode.WriteSchema);

    // Close the FileStream.
    fsWriteXml.Close();

    // Dispose of the original DataSet.
    OriginalDataSet.Dispose();

    // Create a new DataSet.
    DataSet newDataSet = new DataSet("New DataSet");

    // Read the XML document back in.
    // Create new FileStream to read schema with.
    System.IO.FileStream fsReadXml =
        new System.IO.FileStream
        (xmlFilename, System.IO.FileMode.Open);

    // Create an XmlTextReader to read the file.
    System.Xml.XmlTextReader xmlReader =
        new System.Xml.XmlTextReader(fsReadXml);

    // Read the XML document into the DataSet.
    newDataSet.ReadXml(xmlReader, XmlReadMode.ReadSchema);

    // Close the XmlTextReader
    xmlReader.Close();

    // Print out values of each table in the DataSet
    // fusing the unction defined below.
    PrintValues(newDataSet,"New DataSet");
}

private void PrintValues(DataSet dataSet, string label)
{
    Console.WriteLine("\n" + label);
    foreach(DataTable table in dataSet.Tables)
    {
        Console.WriteLine("TableName: " + table.TableName);
        foreach(DataRow row in table.Rows)
        {
            foreach(DataColumn column in table.Columns)
            {
                Console.Write("\t{0}({1})='{2}'", column.ColumnName, column.DataType.Name, row[column]);
            }
            Console.WriteLine();
        }
    }
}

Private Sub DemonstrateReadWriteXMLDocumentWithXMLReader()
    ' Create a DataSet with one table and two columns.
    Dim OriginalDataSet As New DataSet("dataSet")
    OriginalDataSet.Namespace = "NetFrameWork"
    Dim table As New DataTable("table")
    Dim idColumn As New DataColumn("id", _
        Type.GetType("System.Int32"))
    idColumn.AutoIncrement = True

    Dim itemColumn As New DataColumn("item")
    table.Columns.Add(idColumn)
    table.Columns.Add(itemColumn)
    OriginalDataSet.Tables.Add(table)

    ' Add ten rows.
    Dim newRow As DataRow
    Dim i As Integer
    For i = 0 To 9
        newRow = table.NewRow()
        newRow("item") = "item " & i.ToString()
        table.Rows.Add(newRow)
    Next i
    OriginalDataSet.AcceptChanges()

    ' Print out values of each table in the DataSet 
    ' using the function defined below.
    PrintValues(OriginalDataSet, "Original DataSet")

    ' Write the XML schema and data to file with FileStream.
    Dim xmlFilename As String = "XmlDocument.xml"

    ' Create FileStream    
    Dim fsWriteXml As New System.IO.FileStream _
        (xmlFilename, System.IO.FileMode.Create)

    ' Create an XmlTextWriter to write the file.
    Dim xmlWriter As New System.Xml.XmlTextWriter _
        (fsWriteXml, System.Text.Encoding.Unicode)

    ' Use WriteXml to write the document.
    OriginalDataSet.WriteXml(xmlWriter, XmlWriteMode.WriteSchema)

    ' Close the FileStream.
    fsWriteXml.Close()
        
    ' Dispose of the original DataSet.
    OriginalDataSet.Dispose()

    ' Create a new DataSet.
    Dim newDataSet As New DataSet("New DataSet")
        
    ' Read the XML document back in. 
    ' Create new FileStream to read schema with.
    Dim fsReadXml As New System.IO.FileStream _
        (xmlFilename, System.IO.FileMode.Open)

    ' Create an XmlTextReader to read the file.
    Dim xmlReader As New System.Xml.XmlTextReader(fsReadXml)

    ' Read the XML document into the DataSet.
    newDataSet.ReadXml(xmlReader, XmlReadMode.ReadSchema)

    ' Close the XmlTextReader
    xmlReader.Close()
        
    ' Print out values of each table in the DataSet using the 
    ' function defined below.
    PrintValues(newDataSet, "New DataSet")
End Sub
    
    
 Private Sub PrintValues(dataSet As DataSet, label As String)
     Console.WriteLine(ControlChars.Cr & label)
     Dim table As DataTable
     Dim row As DataRow
     Dim column As DataColumn
     For Each table In  dataSet.Tables
         Console.WriteLine("TableName: " & table.TableName)
         For Each row In  table.Rows
             For Each column In  table.Columns
                 Console.Write(ControlChars.Tab & "{0}({1})='{2}'", column.ColumnName, column.DataType.Name, row(column).ToString())

             Next column
             Console.WriteLine()
         Next row
     Next table
  End Sub

備註

此 ReadXml 方法提供一種僅讀取資料，或同時讀取資料與結構的資料 DataSet ，從 XML 文件中讀取的方法，而該 ReadXmlSchema 方法僅讀取結構。 要同時讀取資料與結構，請使用包含參數的ReadXML超載，mode並將其值設為 ReadSchema。

請注意，與WriteXml方法分別也是WriteXmlSchema同理。 若要撰寫 XML 資料，或同時撰寫結構與資料 DataSet，請使用該 WriteXml 方法。 如果只寫結構，就用這個 WriteXmlSchema 方法。

若指定內聯結構，則在載入資料前，內行結構用於擴充現有關聯結構。 若存在衝突（例如同一資料表中同一欄位以不同資料型態定義），會提出例外。

若未指定內列結構，則根據 XML 文件的結構，透過推理擴展關聯結構。 若無法透過推理擴展結構以暴露所有資料，則會提出例外。

如果 的 DataSet XML 架構包含 targetNamespace，資料可能無法讀取，且在 ReadXml 呼叫載入 DataSet 包含無限定命名空間元素的 XML 時，可能會遇到異常。 若要讀取未限定元素，請將您的 XML 架構中將 等值設 elementFormDefault 為「限定」，如下範例所示。

<xsd:schema id="MyDataSet"
   elementFormDefault="qualified"
   targetNamespace="http://www.tempuri.org/MyDataSet.xsd"
   xmlns="http://www.tempuri.org/MyDataSet.xsd"
   xmlns:xsd="http://www.w3.org/2001/XMLSchema"
   xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
</xsd:schema>

System.Xml.XmlTextReader 繼承自 XmlReader。

另請參閱

• 使用 ADO.NET