你好 我刚才测试了请看下面的代码 确实存在问题：
//all.Items.Add(groupRef);//如果这样设置 那么则会出现错误 无法将XmlSchemaGroupRef转换为XmlSchemaElement，而且MSDN上也有说明Items可以添加XmlSchemaGroupRef子元素，这特别的奇怪
personInfo.Particle = groupRef;//只有这样设置才可以 但是无法添加其他子元素咯
运行结果：
<?xml version="1.0" encoding="gb2312"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:group name="persongroup">
<xs:choice>
<xs:element name="child" type="xs:string" />
<xs:element name="house" type="xs:string" />
<xs:element name="car" type="xs:date" />
</xs:choice>
</xs:group>
<xs:complexType name="personinfo">
<xs:group ref="persongroup" />
</xs:complexType>
<xs:element name="person" type="personinfo" />
</xs:schema>
如果这真是一个BUG 那么真如楼主所说 Group的功能就大大减少了 与W3C上面标准也不符合
private static void TestXmlSchema()
{
string ns = "http://www.w3.org/2001/XMLSchema";
XmlSchema schema = new XmlSchema();
XmlSchemaGroup personGroup = new XmlSchemaGroup();
schema.Items.Add(personGroup);
personGroup.Name = "persongroup";
XmlSchemaChoice choice = new XmlSchemaChoice();
personGroup.Particle = choice;
XmlSchemaElement child = new XmlSchemaElement();
child.SchemaTypeName = new XmlQualifiedName("string", ns);
child.Name = "child";
choice.Items.Add(child);
XmlSchemaElement house = new XmlSchemaElement();
house.SchemaTypeName = new XmlQualifiedName("string", ns);
house.Name = "house";
choice.Items.Add(house);
XmlSchemaElement car = new XmlSchemaElement();
car.Name = "car";
car.SchemaTypeName = new XmlQualifiedName("date", ns);
choice.Items.Add(car);
XmlSchemaComplexType personInfo = new XmlSchemaComplexType();
personInfo.Name = "personinfo";
schema.Items.Add(personInfo);
XmlSchemaAll all = new XmlSchemaAll();
personInfo.Particle = all;
XmlSchemaElement firstName = new XmlSchemaElement();
firstName.Name = "firstName";
firstName.SchemaTypeName = new XmlQualifiedName("string", ns);
firstName.MinOccurs = 1;
firstName.MaxOccurs = 1;
all.Items.Add(firstName);
XmlSchemaElement lastName = new XmlSchemaElement();
lastName.Name = "lastName";
lastName.SchemaTypeName = new XmlQualifiedName("string", ns);
lastName.MinOccurs = 1;
lastName.MaxOccurs = 1;
all.Items.Add(lastName);
//注意这里
XmlSchemaGroupRef groupRef = new XmlSchemaGroupRef();
groupRef.RefName = new XmlQualifiedName("persongroup");
//all.Items.Add(groupRef);//如果这样设置 那么则会出现错误 无法将XmlSchemaGroupRef转换为XmlSchemaElement，而且MSDN上也有说明Items可以添加XmlSchemaGroupRef子元素
personInfo.Particle = groupRef;//只有这样设置才可以 但是无法添加其他子元素咯
XmlSchemaElement person = new XmlSchemaElement();
person.Name = "person";
person.SchemaTypeName = new XmlQualifiedName("personinfo");
schema.Items.Add(person);
schema.Compile(ValidationCallbackOne);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(new NameTable());
nsmgr.AddNamespace("xs", ns);
schema.Write(Console.Out, nsmgr);
}
public static void ValidationCallbackOne(object sender, ValidationEventArgs args)
{
Console.WriteLine(args.Message);
}
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