C＃DataContractSerializer SerializationException，在对象字段中设置枚举 [英] C# DataContractSerializer SerializationException with Enum set in object field

问题描述

  [DataContract] 
 public class TestClass 
 {
 [DataMember] 
 public object _TestVariable; 
 
 public TestClass（object value）
 {
 _TestVariable = value; 
 
 
 public void Save（）
 {
 using（XmlDictionaryWriter writer = XmlDictionaryWriter.CreateTextWriter（new FileStream（test.tmp，FileMode.Create）） ）
 {
 DataContractSerializer ser = new DataContractSerializer（typeof（TestClass））; 
 ser.WriteObject（writer，this）; 
} 
} 
} 
 
公开枚举MyEnum 
 {
一，
二，
三
 
  

为什么在 _TestVariable 设置为枚举值？

 新的TestClass（1）.Save（）; // Works 
 new TestClass（asdfqwer）。Save（）; // Works 
 new TestClass（DateTime.UtcNow）.Save（）; // Works 
 new TestClass（MyEnum.One）.Save（）; //失败
  

抛出的异常是：

  System.Runtime.Serialization.SerializationException：键入'xxx.MyEnum'，数据合约名称为xxx.MyEnum：http：//schemas.datacontract.org/2004/07/Tests'不是预期的。考虑使用DataContractResolver或者将静态不知道的任何类型添加到已知类型的列表中 - 例如，通过使用KnownTypeAttribute属性或将它们添加到传递给DataContractSerializer的已知类型的列表中。 
  

解决方案

你应该使用 KnownTypeAttribute 。

  [DataContract] 
 [KnownTypeAttribute（typeof（MyEnum））] 
 public class TestClass 
  

Given the following code,

[DataContract]
public class TestClass
{
  [DataMember]
  public object _TestVariable;

  public TestClass(object value)
  {
    _TestVariable = value;
  }

  public void Save()
  {
    using (XmlDictionaryWriter writer = XmlDictionaryWriter.CreateTextWriter(new FileStream("test.tmp", FileMode.Create)))
    {
      DataContractSerializer ser = new DataContractSerializer(typeof(TestClass));
      ser.WriteObject(writer, this);
    }
  }
}

public enum MyEnum
{
  One,
  Two,
  Three
}

Why does it fail to serialize when _TestVariable is set to an Enum value?

new TestClass(1).Save(); // Works
new TestClass("asdfqwer").Save(); // Works
new TestClass(DateTime.UtcNow).Save(); // Works
new TestClass(MyEnum.One).Save(); // Fails

The exception thrown is:

System.Runtime.Serialization.SerializationException : Type 'xxx.MyEnum' with data contract name 'xxx.MyEnum:http://schemas.datacontract.org/2004/07/Tests' is not expected. Consider using a DataContractResolver or add any types not known statically to the list of known types - for example, by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.

解决方案

You should use KnownTypeAttribute on TestClass.

[DataContract]
[KnownTypeAttribute(typeof(MyEnum))]
public class TestClass

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