问题Json序列化字典<枚举，Int32> [英] Problems with Json Serialize Dictionary<Enum, Int32>

问题描述

每当我尝试序列化字典我得到例外：

  System.ArgumentException：键入
'系统.Collections.Generic.Dictionary`2 [[Foo.DictionarySerializationTest + TestEnum，Foo，Version = 1.0.0.0，Culture = neutral，PublicKeyToken = null]，[System.Int32，mscorlib，Version = 2.0.0.0，Culture = neutral， PublicKeyToken = b77a5c561934e089]]'
不支持序列化/反序列化字典，
键必须是字符串或对象
  

我的测试用例是：

  public class DictionarySerializationTest 
 {
 public enum TestEnum {A，B，C} 
 //尝试使用数字：public enum TestEnum {A = 1，B = 2，C = 3} 
 
 public void SerializationTest ）
 {
 Dictionary< TestEnum，Int32> data = new Dictionary< TestEnum，Int32>（）; 
 
 data.Add（TestEnum.A，1）; 
 data.Add（TestEnum.B，2）; 
 data.Add（TestEnum.C，3）; 
 
 JavaScriptSerializer serializer = new JavaScriptSerializer（）; 
 String result = serializer.Serialize（data）; 
 //抛出
} 
 
 public void SerializationToObjectTest（）
 {
 Dictionary< object，Int32> data = new Dictionary< object，Int32>（）; 
 
 data.Add（Enum.ToObject（typeof（TestEnum），TestEnum.A），1）; 
 data.Add（Enum.ToObject（typeof（TestEnum），TestEnum.B），2）; 
 data.Add（Enum.ToObject（typeof（TestEnum），TestEnum.C），3）; 
 
 JavaScriptSerializer serializer = new JavaScriptSerializer（）; 
 String result = serializer.Serialize（data）; 
 //抛出
} 
 
 public void SerializationStringTest（）
 {
字典< String，Int32> data = new Dictionary< String，Int32>（）; 
 
 data.Add（TestEnum.A.ToString（），1）; 
 data.Add（TestEnum.B.ToString（），2）; 
 data.Add（TestEnum.C.ToString（），3）; 
 
 JavaScriptSerializer serializer = new JavaScriptSerializer（）; 
 String result = serializer.Serialize（data）; 
 //成功
} 
 
} 
  

当然，我可以使用.ToString（）每当我输入一些东西进入Dictionary，但是由于它在性能相关的方法中经常使用，我更喜欢使用枚举。

解决方案是在进入性能关键区域之前使用.ToString（）和转换，但是这是笨拙的，我必须更改我的代码结构才能够序列化数据。

<有没有人有一个想法，我可以如何将序列化字典作为<枚举，Int32> ？

请使用System.Web.Script.Serialization.JavaScriptSerializer进行序列化。

更新：

我切换到字典< String，Int32> 现在，它的工作原理，但我希望有人显示一个解决方案，因为我不喜欢使用字符串代替一个类型安全枚举。

解决方案

我知道很晚了，但也许别人可以在将来使用它。您可以使用LINQ实现您需要的功能：

  Dictionary< TestEnum，Int32> data = new Dictionary< TestEnum，Int32>（）; 
 
 data.Add（TestEnum.A，1）; 
 data.Add（TestEnum.B，2）; 
 data.Add（TestEnum.C，3）; 
 
 JavaScriptSerializer serializer = new JavaScriptSerializer（）; 
字典<字符串的Int32> dataToSerialize = data.Keys.ToDictionary（p => p.ToString（），p => data [p]）; 
 string dataSerialized = serializer.Serialize（dataToSerialize）; 
  

whenever i try to serialize the dictionary i get the exception:

System.ArgumentException: Type 
'System.Collections.Generic.Dictionary`2[[Foo.DictionarySerializationTest+TestEnum, Foo, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null],[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]]'
is not supported for serialization/deserialization of a dictionary,
keys must be strings or object

My Testcase is:

public class DictionarySerializationTest
{
  public enum TestEnum { A, B, C }
  //tried with numbers, too: public enum TestEnum { A = 1, B = 2, C = 3 }

  public void SerializationTest()
  {
    Dictionary<TestEnum, Int32> data = new Dictionary<TestEnum, Int32>();

    data.Add(TestEnum.A, 1);
    data.Add(TestEnum.B, 2);
    data.Add(TestEnum.C, 3);

    JavaScriptSerializer serializer = new JavaScriptSerializer();
    String result = serializer.Serialize(data);
    // Throws
  }

  public void SerializationToObjectTest()
  {
    Dictionary<object, Int32> data = new Dictionary<object, Int32>();

    data.Add(Enum.ToObject(typeof(TestEnum), TestEnum.A), 1);
    data.Add(Enum.ToObject(typeof(TestEnum), TestEnum.B), 2);
    data.Add(Enum.ToObject(typeof(TestEnum), TestEnum.C), 3);

    JavaScriptSerializer serializer = new JavaScriptSerializer();
    String result = serializer.Serialize(data);
    // Throws
  }

  public void SerializationStringTest()
  {
    Dictionary<String, Int32> data = new Dictionary<String, Int32>();

    data.Add(TestEnum.A.ToString(), 1);
    data.Add(TestEnum.B.ToString(), 2);
    data.Add(TestEnum.C.ToString(), 3);

    JavaScriptSerializer serializer = new JavaScriptSerializer();
    String result = serializer.Serialize(data);
    // Succeeds
  }

}

Of course i could use .ToString() whenever i enter something into the Dictionary but since it's used quite often in performance relevant methods i would prefer using the enum.

My only solution is using .ToString() and converting before entering the performance critical regions but that is clumsy and i would have to change my code structure just to be able to serialize the data.

Does anyone have an idea how i could serialize the dictionary as <Enum, Int32>?

I use the System.Web.Script.Serialization.JavaScriptSerializer for serialization.

UPDATE:

I switched to Dictionary<String, Int32> now and it works but i hope someone shows a solution as i don't really like using strings in place of a type safe enum.

解决方案

I know it's late, but maybe someone else can make use of it in the future. You can achieve what you need using LINQ:

Dictionary<TestEnum, Int32> data = new Dictionary<TestEnum, Int32>();

data.Add(TestEnum.A, 1);
data.Add(TestEnum.B, 2);
data.Add(TestEnum.C, 3);

JavaScriptSerializer serializer = new JavaScriptSerializer();
Dictionary<string, Int32> dataToSerialize = data.Keys.ToDictionary(p => p.ToString(), p => data[p]);
string dataSerialized = serializer.Serialize(dataToSerialize);

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