[代码]使用XSD验证XML示例2(LINQtoXML)

此代码仍然是演示如何使用LINQ to XML的XDocument.Validate()方法根据指定的XSD验证XDocument内容的有效性。

示例代码
程序首先加载XSD和XML文档到内存，然后对其进行验证，第一次的验证成功地通过。紧接着，修改其中一个客户的编号，再对这个修改过的XML内容进行验证，则产生了异常。因为引用此客户编号的订单相关数据并没有被更新。如果使用没修改之前的客户编号来查找客户的话，自然是找不到了。

下面是用来验证XML的XSD架构定义：
<?xml version="1.0" encoding="utf-8" ?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name='Root'> <xs:complexType> <xs:sequence> <xs:element name='Customers'> <xs:complexType> <xs:sequence> <xs:element name='Customer' type='CustomerType' minOccurs='0' maxOccurs='unbounded' /> </xs:sequence> </xs:complexType> </xs:element> <xs:element name='Orders'> <xs:complexType> <xs:sequence> <xs:element name='Order' type='OrderType' minOccurs='0' maxOccurs='unbounded' /> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> <xs:key name='CustomerIDKey'> <xs:selector xpath='Customers/Customer'/> <xs:field xpath='@CustomerID'/> </xs:key> <xs:keyref name='CustomerIDKeyRef' refer='CustomerIDKey'> <xs:selector xpath='Orders/Order'/> <xs:field xpath='CustomerID'/> </xs:keyref> </xs:element> <xs:complexType name='CustomerType'> <xs:sequence> <xs:element name='CompanyName' type='xs:string'/> <xs:element name='ContactName' type='xs:string'/> <xs:element name='ContactTitle' type='xs:string'/> <xs:element name='Phone' type='xs:string'/> <xs:element name='Fax' minOccurs='0' type='xs:string'/> <xs:element name='FullAddress' type='AddressType'/> </xs:sequence> <xs:attribute name='CustomerID' type='xs:token'/> </xs:complexType> <xs:complexType name='AddressType'> <xs:sequence> <xs:element name='Address' type='xs:string'/> <xs:element name='City' type='xs:string'/> <xs:element name='Region' type='xs:string'/> <xs:element name='PostalCode' type='xs:string' /> <xs:element name='Country' type='xs:string'/> </xs:sequence> <xs:attribute name='CustomerID' type='xs:token'/> </xs:complexType> <xs:complexType name='OrderType'> <xs:sequence> <xs:element name='CustomerID' type='xs:token'/> <xs:element name='EmployeeID' type='xs:token'/> <xs:element name='OrderDate' type='xs:dateTime'/> <xs:element name='RequiredDate' type='xs:dateTime'/> <xs:element name='ShipInfo' type='ShipInfoType'/> </xs:sequence> </xs:complexType> <xs:complexType name='ShipInfoType'> <xs:sequence> <xs:element name='ShipVia' type='xs:integer'/> <xs:element name='Freight' type='xs:decimal'/> <xs:element name='ShipName' type='xs:string'/> <xs:element name='ShipAddress' type='xs:string'/> <xs:element name='ShipCity' type='xs:string'/> <xs:element name='ShipRegion' type='xs:string'/> <xs:element name='ShipPostalCode' type='xs:string'/> <xs:element name='ShipCountry' type='xs:string'/> </xs:sequence> <xs:attribute name='ShippedDate' type='xs:dateTime'/> </xs:complexType></xs:schema>
下面这是要进行验证的XML文档内容：
<?xml version="1.0" encoding="utf-8" ?><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name='Root'> <xs:complexType> <xs:sequence> <xs:element name='Customers'> <xs:complexType> <xs:sequence> <xs:element name='Customer' type='CustomerType' minOccurs='0' maxOccurs='unbounded' /> </xs:sequence> </xs:complexType> </xs:element> <xs:element name='Orders'> <xs:complexType> <xs:sequence> <xs:element name='Order' type='OrderType' minOccurs='0' maxOccurs='unbounded' /> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> <xs:key name='CustomerIDKey'> <xs:selector xpath='Customers/Customer'/> <xs:field xpath='@CustomerID'/> </xs:key> <xs:keyref name='CustomerIDKeyRef' refer='CustomerIDKey'> <xs:selector xpath='Orders/Order'/> <xs:field xpath='CustomerID'/> </xs:keyref> </xs:element> <xs:complexType name='CustomerType'> <xs:sequence> <xs:element name='CompanyName' type='xs:string'/> <xs:element name='ContactName' type='xs:string'/> <xs:element name='ContactTitle' type='xs:string'/> <xs:element name='Phone' type='xs:string'/> <xs:element name='Fax' minOccurs='0' type='xs:string'/> <xs:element name='FullAddress' type='AddressType'/> </xs:sequence> <xs:attribute name='CustomerID' type='xs:token'/> </xs:complexType> <xs:complexType name='AddressType'> <xs:sequence> <xs:element name='Address' type='xs:string'/> <xs:element name='City' type='xs:string'/> <xs:element name='Region' type='xs:string'/> <xs:element name='PostalCode' type='xs:string' /> <xs:element name='Country' type='xs:string'/> </xs:sequence> <xs:attribute name='CustomerID' type='xs:token'/> </xs:complexType> <xs:complexType name='OrderType'> <xs:sequence> <xs:element name='CustomerID' type='xs:token'/> <xs:element name='EmployeeID' type='xs:token'/> <xs:element name='OrderDate' type='xs:dateTime'/> <xs:element name='RequiredDate' type='xs:dateTime'/> <xs:element name='ShipInfo' type='ShipInfoType'/> </xs:sequence> </xs:complexType> <xs:complexType name='ShipInfoType'> <xs:sequence> <xs:element name='ShipVia' type='xs:integer'/> <xs:element name='Freight' type='xs:decimal'/> <xs:element name='ShipName' type='xs:string'/> <xs:element name='ShipAddress' type='xs:string'/> <xs:element name='ShipCity' type='xs:string'/> <xs:element name='ShipRegion' type='xs:string'/> <xs:element name='ShipPostalCode' type='xs:string'/> <xs:element name='ShipCountry' type='xs:string'/> </xs:sequence> <xs:attribute name='ShippedDate' type='xs:dateTime'/> </xs:complexType></xs:schema>
示例代码如下：
using System.Collections.Generic;using System.Linq;using System.Text;using System.Xml.Schema;using System.Xml.Linq;namespace Demo06Ex02{ class Program { static void Main(string[] args) { // ************************************************* // 这里对没有修改过的XML文档进行验证，能够通过。 // ************************************************* XmlSchemaSet Schemas = new XmlSchemaSet(); Schemas.Add("", @"C:/LINQ/CustomersOrders.xsd"); Console.WriteLine("Attempting to validate..."); XDocument Document = XDocument.Load(@"C:/LINQ/CustomersOrders.xml"); bool Errors = false; Document.Validate(Schemas, (o, e) => { Console.WriteLine(e.Message); Errors = true; }); Console.WriteLine("CustomersOrders.xml {0}", Errors ? "did not validate" : "validated"); Console.WriteLine(); // ******************************************************** // 修改了客户的编号之后，再次验证就引发了异常。 // ******************************************************** Document.Root.Element("Orders").Element("Order") .Element("CustomerID").Value = "AAAAA"; Console.WriteLine("Attempting to validate after modification..."); Errors = false; Document.Validate(Schemas, (o, e) => { Console.WriteLine(e.Message); Errors = true; }); Console.WriteLine("CustomersOrders.xml {0}", Errors ? "did not validate" : "validated"); } }}