SqlDataReader.GetValues(Object[]) 方法

定義

命名空間:
System.Data.SqlClient
組件:
System.Data.SqlClient.dll
組件:
System.Data.dll
來源:
System.Data.SqlClient.notsupported.cs

使用目前數據列的數據行值填入 物件的陣列。

public:
 override int GetValues(cli::array <System::Object ^> ^ values);
public:
 virtual int GetValues(cli::array <System::Object ^> ^ values);
public override int GetValues(object[] values);
public int GetValues(object[] values);
override this.GetValues : obj[] -> int
abstract member GetValues : obj[] -> int
override this.GetValues : obj[] -> int
Public Overrides Function GetValues (values As Object()) As Integer
Public Function GetValues (values As Object()) As Integer

參數

values
Object[]

一個用來複製屬性欄位的陣列 Object 。

傳回

Int32

陣列中 的 Object 實例數。

實作

GetValues(Object[])

範例

以下範例示範使用適當大小的陣列，讀取目前所提供 SqlDataReader列的所有值。 此外，範例展示了使用固定大小的陣列，該陣列可小於或大於可用欄位數。

private static void TestGetValues(SqlDataReader reader)
{
    // Given a SqlDataReader, use the GetValues
    // method to retrieve a full row of data.
    // Test the GetValues method, passing in an array large
    // enough for all the columns.
    Object[] values = new Object[reader.FieldCount];
    int fieldCount = reader.GetValues(values);

    Console.WriteLine("reader.GetValues retrieved {0} columns.",
        fieldCount);
    for (int i = 0; i < fieldCount; i++)
        Console.WriteLine(values[i]);

    Console.WriteLine();

    // Now repeat, using an array that may contain a different
    // number of columns than the original data. This should work correctly,
    // whether the size of the array is larger or smaller than
    // the number of columns.

    // Attempt to retrieve three columns of data.
    values = new Object[3];
    fieldCount = reader.GetValues(values);
    Console.WriteLine("reader.GetValues retrieved {0} columns.",
        fieldCount);
    for (int i = 0; i < fieldCount; i++)
        Console.WriteLine(values[i]);
}

Private Sub TestGetValues(ByVal reader As SqlDataReader)

    ' Given a SqlDataReader, use the GetValues
    ' method to retrieve a full row of data.

    ' Test the GetValues method, passing in an array large
    ' enough for all the columns.
    Dim values(reader.FieldCount - 1) As Object
    Dim fieldCount As Integer = reader.GetValues(values)
    Console.WriteLine("reader.GetValues retrieved {0} columns.", _
         fieldCount)
    For i As Integer = 0 To fieldCount - 1
        Console.WriteLine(values(i))
    Next

    Console.WriteLine()

    ' Now repeat, using an array that may contain a different 
    ' number of columns than the original data. This should work correctly,
    ' whether the size of the array is larger or smaller than 
    ' the number of columns.

    ' Attempt to retrieve three columns of data.
    ReDim values(2)
    fieldCount = reader.GetValues(values)
    Console.WriteLine("reader.GetValues retrieved {0} columns.", _
    fieldCount)
    For i As Integer = 0 To fieldCount - 1
        Console.WriteLine(values(i))
    Next
End Sub

備註

對大多數應用而言，此方法提供了高效取得所有欄位的方法，而非逐欄擷取。

你可以傳遞 Object 一個陣列數少於結果列中欄位數的陣列。 只有陣列所儲存的資料 Object 量會被複製到陣列中。 你也可以傳遞 Object 一個長度超過該列欄位數的陣列。

此方法回傳 DBNull 為空資料庫欄位。

適用於

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