不能使用Json.net使用复杂键序列化字典 [英] Not ableTo Serialize Dictionary with Complex key using Json.net

问题描述

我有一个带有自定义.net类型的字典作为其键。我正在尝试使用JSON.net将该字典序列化为JSON，但是在序列化期间无法将密钥转换为正确的值。

I have a dictionary with a custom .net Type as Its key.I am trying to serialize this dictionary to JSON using JSON.net, However its not able to Convert Keys to Proper Value during Serialization.

class ListBaseClass
{
    public String testA;
    public String testB;
}
-----
var details = new Dictionary<ListBaseClass, string>();
details.Add(new ListBaseClass { testA = "Hello", testB = "World" }, "Normal");
var results = Newtonsoft.Json.JsonConvert.SerializeObject(details);
var data = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<ListBaseClass, string>> results);

这给我 - >{\JSonSerialization.ListBaseClass\：\正常\

This Give me --> "{\"JSonSerialization.ListBaseClass\":\"Normal\"}"

但是，如果我将自定义类型作为字典中的值，那么 b
$ b

However if I have my Custom type as value in Dictionary it Works well

  var details = new Dictionary<string, ListBaseClass>();
  details.Add("Normal", new ListBaseClass { testA = "Hello", testB = "World" });
  var results = Newtonsoft.Json.JsonConvert.SerializeObject(details);
  var data = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, ListBaseClass>>(results);

这给我 - >{\Normal\：{\testA \：\Hello\，\testB\：\World \}}

This Give me --> "{\"Normal\":{\"testA\":\"Hello\",\"testB\":\"World\"}}"

可以有人建议如果我我遇到了一些Json.net的限制，或者我在做某些错误？

Can Someone Suggest If I am hitting some limitation of Json.net or I am doing Something Wrong?

推荐答案

序列化指南（参见：字典和Hashtables部分;谢谢@Shashwat的链接）：

The Serialization Guide states (see section: Dictionaries and Hashtables; thank you @Shashwat for the link):

当序列化字典时，字典的键将
转换为字符串，并用作JSON对象属性名称。为密钥编写的
字符串可以通过重写
ToString（）作为键类型或通过实现TypeConverter进行自定义。 A
TypeConverter还支持在对字典进行反序列化时再次将自定义字符串转换为
。

When serializing a dictionary, the keys of the dictionary are converted to strings and used as the JSON object property names. The string written for a key can be customized by either overriding ToString() for the key type or by implementing a TypeConverter. A TypeConverter will also support converting a custom string back again when deserializing a dictionary.

我发现有关如何在Microsoft的how-to页面上实现此类型转换器的有用示例：

I found a useful example for how to implement such a type converter on Microsoft's "how-to" page:

• 实现类型转换器（请参阅类型转换器进行价值转换）。

• Implement a Type Converter (see section Type Converters for Value Translation).

本质上，我需要扩展 System.ComponentModel.TypeConverter 并覆盖：

Essentially, I needed to extend System.ComponentModel.TypeConverter and override:

bool CanConvertFrom（ITypeDescriptorContext context，Type source）
对象ConvertFrom（ITypeDescriptorContext context，
System.Globalization.CultureInfo culture ，对象值）
对象ConvertTo（ITypeDescriptorContext上下文，
System.Globalization.CultureInfo文化，
对象值，类型destinationType）


还需要将 [TypeConverter（typeof（MyClassConverter））] 的属性添加到

有了这些，我可以自动序列化和反序列化字典 / em>。

With these in place, I was able to serialize and deserialize dictionaries automatically.

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