Quick JSON Serialization/Deserialization in C#

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#json #c# #silverlight #dictionary #date #reference

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本文详细介绍了如何利用JavaScriptSerializer库在Silverlight和.NET4.0环境中进行JSON的解析和序列化操作。通过提供具体的代码示例，展示了如何将JSON字符串转换为字典，以及如何从字典反序列化回JSON格式。此外，还讨论了使用动态类型进行序列化和反序列化的优缺点。

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You don’t need to download an additional libraryto serialize/deserialize your objects to/from JSON. Since .NET 3.5, .NET can do it natively.

Add a reference to your project to “System.Web.Extensions.dll”

Let’s look at this example JSON string:

 
   1{
 
   2    "some_number": 108.541, 
 
   3    "date_time": "2011-04-13T15:34:09Z",  
 
   4    "serial_number": "SN1234"
 
   5}

You can deserialize the previous JSON into a dictionary like so:

 
   1using System.Web.Script.Serialization;
 
   2 
 
   3var jss = new JavaScriptSerializer();
 
   4var dict = jss.Deserialize<Dictionary<string,string>>(jsonText);
 
   5 
 
   6Console.WriteLine(dict["some_number"]); //outputs 108.541

So what if your JSON is a bit more complex?

 
   1{
 
   2    "some_number": 108.541, 
 
   3    "date_time": "2011-04-13T15:34:09Z",  
 
   4    "serial_number": "SN1234"
 
   5    "more_data": {
 
   6        "field1": 1.0
 
   7        "field2": "hello"  
 
   8    }
 
   9}

Deserialize like so…

 
   1using System.Web.Script.Serialization;
 
   2 
 
   3var jss = new JavaScriptSerializer();
 
   4var dict = jss.Deserialize<Dictionary<string,dynamic>>(jsonText);
 
   5 
 
   6Console.WriteLine(dict["some_number"]); //outputs 108.541
 
   7Console.WriteLine(dict["more_data"]["field2"]); //outputs hello

The field “more_data” gets deserialized into a Dictionary<string, object>.

You can actually just just deserialize like so:

 
   1using System.Web.Script.Serialization;
 
   2 
 
   3var jss = new JavaScriptSerializer();
 
   4var dict = jss.Deserialize<dynamic>(jsonText);
 
   5 
 
   6Console.WriteLine(dict["some_number"]); //outputs 108.541
 
   7Console.WriteLine(dict["more_data"]["field2"]); //outputs hello

And everything still works the same. The only caveat is that you lose intellisense by using the “dynamic” data type.

Serialization is just as easy:

 
   1using System.Web.Script.Serialization;
 
   2 
 
   3var jss = new JavaScriptSerializer();
 
   4var dict = jss.Deserialize<dynamic>(jsonText);
 
   5 
 
   6var json = jss.Serialize(dict);
 
   7Console.WriteLine(json);