Extensions 類別

定義

public ref class Extensions abstract sealed

public static class Extensions

type Extensions = class

Public Module Extensions

繼承

Object

Extensions

範例

範例 XSD 檔案中的 XSD：客戶與訂單 包含一個可用來驗證範例 XML 檔案：客戶與訂單中 XML 文件的結構。 以下範例載入結構與文件，驗證文件，修改文件使 xs:key and xs:keyref 關係無效，然後嘗試再次驗證。

                XmlSchemaSet schemas = new XmlSchemaSet();
schemas.Add("", "CustomersOrders.xsd");

XDocument custOrd = XDocument.Load("CustomersOrders.xml");

Console.WriteLine("Validating custOrd");
bool errors = false;
custOrd.Validate(schemas, (o, e) =>
                     {
                         Console.WriteLine("{0}", e.Message);
                         errors = true;
                     });
Console.WriteLine("custOrd {0}", errors ? "did not validate" : "validated");

// Modify the custOrd tree so that it is no longer valid.
custOrd.Root.Element("Orders").Element("Order").Element("CustomerID").Value = "AAAAA";

Console.WriteLine();
Console.WriteLine("Validating custOrd");
errors = false;
custOrd.Validate(schemas, (o, e) =>
                     {
                         Console.WriteLine("{0}", e.Message);
                         errors = true;
                     });
Console.WriteLine("custOrd {0}", errors ? "did not validate" : "validated");

                Dim errors As Boolean = False

Private Sub XSDErrors(ByVal o As Object, ByVal e As ValidationEventArgs)
    Console.WriteLine("{0}", e.Message)
    errors = True
End Sub

Sub Main()
    Dim schemas As XmlSchemaSet = New XmlSchemaSet()
    schemas.Add("", "CustomersOrders.xsd")

    Console.WriteLine("Validating custOrd")
    Dim custOrd As XDocument = XDocument.Load("CustomersOrders.xml")
    errors = False
    custOrd.Validate(schemas, AddressOf XSDErrors)
    Console.WriteLine("custOrd {0}", IIf(errors, "did not validate", "validated"))

    Console.WriteLine()
    Console.WriteLine("Validating custOrd")
    ' Modify the source document so that it will not validate.
    custOrd.Root.Element("Orders").Element("Order").Element("CustomerID").Value = "AAAAA"
    errors = False
    custOrd.Validate(schemas, AddressOf XSDErrors)
    Console.WriteLine("custOrd {0}", IIf(errors, "did not validate", "validated"))
End Sub

此範例會產生下列輸出：

Validating custOrd
custOrd validated

Validating custOrd
The key sequence 'AAAAA' in Keyref fails to refer to some key.
custOrd did not validate

備註

此類別亦包含取得驗證後 XML 節點的後結構驗證資訊集（PSVI）的方法。

當你 XDocument驗證 、 XElement或 XAttribute時，也可以選擇性地將 post-schema-validation 資訊集填充 XML 樹。 PSVI 資訊以 類型 System.Xml.Schema.XmlSchemaInfo的註解形式加入。