using System.Web.Script.Serialization;

public class JsonHelper
{
    public static string ObjectToJsonString<T>(T t)
    {
        JavaScriptSerializer js = new JavaScriptSerializer();
        //序列化方法：將T類型對象轉換為Json字符串
        return js.Serialize(t);
    }

    public static T JsonStringToObject<T>(string str)
    {
        JavaScriptSerializer js = new JavaScriptSerializer();
        //反序列化方法：將Json字符串轉化為T類型對象
        return js.Deserialize<T>(str);
    }
}

C# Json序列化和反序列化