C # 的 JSON 库

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System.Web.Script.Serialization.JavaScriptSerializer

Have a look at the system.web.script.serialization namespace (i think you will need .Net 3.5)

If you look here, you will see several different libraries for JSON on C#.

http://json.org/

You will find a version for LINQ as well as some others. There are about 7 libraries for C# and JSON.

JSON.Net

The .net framework supports JSON through JavaScriptSerializer. Here is a good example to get you started.

using System.Collections.Generic;
using System.Web.Script.Serialization;


namespace GoogleTranslator.GoogleJSON
{
public class FooTest
{
public void Test()
{
const string json = @"{
""DisplayFieldName"" : ""ObjectName"",
""FieldAliases"" : {
""ObjectName"" : ""ObjectName"",
""ObjectType"" : ""ObjectType""
},
""PositionType"" : ""Point"",
""Reference"" : {
""Id"" : 1111
},
""Objects"" : [
{
""Attributes"" : {
""ObjectName"" : ""test name"",
""ObjectType"" : ""test type""
},
""Position"" :
{
""X"" : 5,
""Y"" : 7
}
}
]
}";


var ser = new JavaScriptSerializer();
ser.Deserialize<Foo>(json);
}
}


public class Foo
{
public Foo() { Objects = new List<SubObject>(); }
public string DisplayFieldName { get; set; }
public NameTypePair FieldAliases { get; set; }
public PositionType PositionType { get; set; }
public Ref Reference { get; set; }
public List<SubObject> Objects { get; set; }
}


public class NameTypePair
{
public string ObjectName { get; set; }
public string ObjectType { get; set; }
}


public enum PositionType { None, Point }
public class Ref
{
public int Id { get; set; }
}


public class SubObject
{
public NameTypePair Attributes { get; set; }
public Position Position { get; set; }
}


public class Position
{
public int X { get; set; }
public int Y { get; set; }
}
}

Try the Vici Project, Vici Parser. It includes a JSON parser / tokeniser. It works great, we use it together with the MVC framework.

More info at: http://viciproject.com/wiki/projects/parser/home

I forgot to say that it is open source so you can always take a look at the code if you like.

You should also try my ServiceStack JsonSerializer - it's the fastest .NET JSON serializer at the moment based on the benchmarks of the leading JSON serializers and supports serializing any POCO Type, DataContracts, Lists/Dictionaries, Interfaces, Inheritance, Late-bound objects including anonymous types, etc.

Basic Example

var customer = new Customer { Name="Joe Bloggs", Age=31 };
var json = customer.ToJson();
var fromJson = json.FromJson<Customer>();

Note: Only use Microsofts JavaScriptSerializer if performance is not important to you as I've had to leave it out of my benchmarks since its up to 40x-100x slower than the other JSON serializers.

To answer your first question, Microsoft does ship a DataContractJsonSerializer: see msdn How to: Serialize and Deserialize JSON Data

To give a more up to date answer to this question: yes, .Net includes JSON seriliazer/deserliazer since version 3.5 through the System.Runtime.Serialization.Json Namespace: http://msdn.microsoft.com/en-us/library/system.runtime.serialization.json(v=vs.110).aspx

But according to the creator of JSON.Net, the .Net Framework compared to his open source implementation is very much slower.