c# 解析json数据

1 解析需要用到 Newtonsoft.Json.dll ,c#需要引用此dll

2 添加一个类文件JSON.cs类文件,代码如下using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Text;
using System.Web.Script.Serialization;
/*这里就不要动了，要添加就到部分类中去添加*/
namespace WindowsFormsApplication7
{
public static partial class JSON
{

/// <summary>
/// 使用Newtonsoft.Json进行对象转换字符串
/// </summary>
/// <param name="jsonObject">对象</param>
/// <returns>json字符串</returns>
public static string SerializeObj(object jsonObject)
{
return JsonConvert.SerializeObject(jsonObject);

}
/// <summary>
/// 使用Newtonsoft.Json进行字符串转换对象
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="json"></param>
/// <returns></returns>
public static T DeSerializeObj<T>(string json)
{
return JsonConvert.DeserializeObject<T>(json);
}
/// <summary>
/// 使用Newtonsoft.Json进行字符串转换JArray数组
/// </summary>
/// <param name="json"></param>
/// <returns></returns>
public static JArray SerializeObj(string json)
{
return JArray.Parse(json);

}
/// <summary>
/// datatable转json
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
public static string TableToJson(DataTable dt)
{
StringBuilder jsonBuilder = new StringBuilder();
jsonBuilder.Append("[");
for (int i = 0; i < dt.Rows.Count; i++)
{
jsonBuilder.Append("{");
for (int j = 0; j < dt.Columns.Count; j++)
{
jsonBuilder.Append("\"");
jsonBuilder.Append(dt.Columns[j].ColumnName);
jsonBuilder.Append("\":\"");
jsonBuilder.Append(dt.Rows[i][j].ToString());
jsonBuilder.Append("\",");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder.Append("},");
}
jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
jsonBuilder = jsonBuilder.Length == 0 ? jsonBuilder.Append("[") : jsonBuilder;
jsonBuilder.Append("]");
return jsonBuilder.ToString();
}
public static DataTable ToDataTable(this string json)
{
DataTable dataTable = new DataTable(); //实例化
DataTable result;
try
{
JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();
javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
if (arrayList.Count > 0)
{
foreach (Dictionary<string, object> dictionary in arrayList)
{
if (dictionary.Keys.Count == 0)
{
result = dataTable;
return result;
}
if (dataTable.Columns.Count == 0)
{
foreach (string current in dictionary.Keys)
{
dataTable.Columns.Add(current, dictionary[current].GetType());
}
}
DataRow dataRow = dataTable.NewRow();
foreach (string current in dictionary.Keys)
{
dataRow[current] = dictionary[current];
}

dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
}
}
}
catch
{
}
result = dataTable;
return result;
}
}
}
3  定义解析json所使用的类

public class test
{
private string _code;

public string code
{
get { return _code; }
set { _code = value; }
}
private string _message;

public string message
{
get { return _message; }
set { _message = value; }
}
private List<Datas> _data;

public List<Datas> data
{
get { return _data; }
set { _data = value; }
}
}
public class Datas
{
private string _name1;

public string name1
{
get { return _name1; }
set { _name1 = value; }
}
private string _name2;

public string name2
{
get { return _name2; }
set { _name2 = value; }
}
}4 解析json代码入下  第3点所声明的类 是对应的json字符串中的内容声明，请自行根据自己要解析的json声明类文件。
string json= @"{""code"": ""S"",""message"": ""SUCCESS"", ""data"": [{""name1"": ""value1"",""name2"": ""value2""},{""name1"": ""value1"",""name2"": ""value2""}]}";
var obj = JSON.DeSerializeObj<test>(json);
obj.data[0].name1.ToString();