刚接触c#，不知道怎么用(System.Xml.Serialization.XmlTypeAttribute)

[春天到了冬天还远吗]

现在想用C#做个简单的测试网页
用vs带的wsdl生成一个cs文件不知道怎么用了

[System.CodeDom.Compiler.GeneratedCodeAttribute("wsdl", "2.0.50727.42")]
[System.SerializableAttribute()]
[System.Diagnostics.DebuggerStepThroughAttribute()]
[System.ComponentModel.DesignerCategoryAttribute("code")]
[System.Xml.Serialization.XmlTypeAttribute(Namespace="http://www.egeyes.cn/CMS/")]
public partial class CReq {
    
    private object itemField;
    
    /// <remarks/>
    [System.Xml.Serialization.XmlElementAttribute("C1", typeof(CC1), Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    [System.Xml.Serialization.XmlElementAttribute("C2", typeof(CC2), Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    [System.Xml.Serialization.XmlElementAttribute("C3", typeof(CC3), Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    [System.Xml.Serialization.XmlElementAttribute("C4", typeof(CC4), Form=System.Xml.Schema.XmlSchemaForm.Unqualified)]
    public object Item {
        get {
            return this.itemField;
        }
        set {
            this.itemField = value;
        }
    }
}

我猜测要从C1-C4中定义一个对象，但不知道怎么把这个对象跟Item 联系起来

比如
CReq req = new CReq();
C1 c = new C1();

我该怎么才能让C1通过Item和req联系起来？代码怎么写？
我没C#基础，只是暂时用下，希望大家能帮下忙
谢谢

[西蒙君霸占阿花]

不懂,帮顶.

[春天到了冬天还远吗]

刚群里大牛指点了下
CReq req = new CReq();
C1 c = new C1();
req.Item = c;
报“System.NullReferenceException: 未将对象引用设置到对象的实例”错误

[春天到了冬天还远吗]

[Quote=引用 2 楼 wtx_sonery 的回复:]

刚群里大牛指点了下
CReq req = new CReq();
C1 c = new C1();
req.Item = c;
报“System.NullReferenceException: 未将对象引用设置到对象的实例”错误
[/Quote]
是我自己写错了~~

[Dobzhansky]

这个 item 可以是那四种类型的对象

[cento123]

C1 c;
// Construct an instance of the XmlSerializer with the type
// of object that is being deserialized.
XmlSerializer mySerializer = 
new XmlSerializer(typeof(C1));
// To read the file, create a FileStream.
FileStream myFileStream = 
new FileStream("myFileName.xml", FileMode.Open);
// Call the Deserialize method and cast to the object type.
c = (C1)mySerializer.Deserialize(myFileStream)

myFileName.xml中每个xml节点是C1的一个属性。