相关疑难解决方法(0)

我在序列化枚举值时遇到问题.

这是代码:

[System.Xml.Serialization.XmlRootAttribute(Namespace = "", IsNullable = false)]
public class REQUEST
{
    [System.Xml.Serialization.XmlAttributeAttribute()]
    public string ID;

    [System.Xml.Serialization.XmlAttributeAttribute()]
    public REQUESTTypetype Type;
}

public enum REQUESTTypetype
{
    One,
    Two,
    Three,
    Four,
}

...

REQUEST request = new REQUEST();
request.ID = "1234";
request.Type = REQUESTTypetype.One;

XmlDocument doc = new XmlDocument();
MemoryStream ms = new MemoryStream();
StreamWriter sw = new StreamWriter(ms);
XmlSerializer xs = new XmlSerializer(typeof(REQUEST));
xs.Serialize(sw, request_group);
ms.Position = 0;
doc.Load(ms);
TestWriteXml(doc, @"C:\xml_test.xml");

结果是:

<?xml version="1.0" encoding="utf-8" ?> 
<REQUEST ID="1234" />

为什么枚举不是序列化的？我使用.NET Framework …