ASP.NET输出Json格式数据

protected void Page_Load(object sender, EventArgs e)
{
//ASP.NET输出JSON格式数据示例
//1:自带的JavaScriptSerializer来生成JSON数据
IList<UserModels> UserList = new List<UserModels>();
for (int i = 0; i < 3; i++)
{
UserModels user = new UserModels();
user.userId = i + 1;
user.userName = "ZhangSan";
user.userPass = "12345678";
UserList.Add(user);
}
JavaScriptSerializer ser = new JavaScriptSerializer();
String jsonStr = ser.Serialize(UserList);
Response.Write(jsonStr);
}

namespace Systemjson
{
public class JsonHelper
{
/// <summary>
/// 对象转JSON
/// </summary>
/// <param name="obj">对象</param>
/// <returns>JSON格式的字符串</returns>
public static string ObjectToJson(object obj)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
try
{
return jss.Serialize(obj);
}
catch (Exception ex)
{

throw new Exception("JSONHelper.ObjectToJSON(): " + ex.Message);
}
}

/// <summary>
/// 数据表转键值对集合
/// 把DataTable转成 List集合, 存每一行
/// 集合中放的是键值对字典,存每一列
/// </summary>
/// <param name="dt">数据表</param>
/// <returns>哈希表数组</returns>
public static List<Dictionary<string, object>> DataTableToList(DataTable dt)
{
List<Dictionary<string, object>> list = new List<Dictionary<string, object>>();

foreach (DataRow dr in dt.Rows)
{
Dictionary<string, object> dic = new Dictionary<string, object>();
foreach (DataColumn dc in dt.Columns)
{
dic.Add(dc.ColumnName, dr[dc.ColumnName]);
}
list.Add(dic);
}
return list;
}

/// <summary>
/// 数据集转键值对数组字典
/// </summary>
/// <param name="dataSet">数据集</param>
/// <returns>键值对数组字典</returns>
public static Dictionary<string, List<Dictionary<string, object>>> DataSetToDic(DataSet ds)
{
Dictionary<string, List<Dictionary<string, object>>> result = new Dictionary<string, List<Dictionary<string, object>>>();

foreach (DataTable dt in ds.Tables)
result.Add(dt.TableName, DataTableToList(dt));

return result;
}

/// <summary>
/// 数据表转JSON
/// </summary>
/// <param name="dataTable">数据表</param>
/// <returns>JSON字符串</returns>
public static string DataTableToJson(DataTable dt)
{
return ObjectToJson(DataTableToList(dt));
}

/// <summary>
/// JSON文本转对象,泛型方法
/// </summary>
/// <typeparam name="T">类型</typeparam>
/// <param name="jsonText">JSON文本</param>
/// <returns>指定类型的对象</returns>
public static T JsonToObject<T>(string jsonText)
{
JavaScriptSerializer jss = new JavaScriptSerializer();
try
{
return jss.Deserialize<T>(jsonText);
}
catch (Exception ex)
{
throw new Exception("JSONHelper.JSONToObject(): " + ex.Message);
}
}

/// <summary>
/// 将JSON文本转换为数据表数据
/// </summary>
/// <param name="jsonText">JSON文本</param>
/// <returns>数据表字典</returns>
public static Dictionary<string, List<Dictionary<string, object>>> TablesDataFromJson(string jsonText)
{
return JsonToObject<Dictionary<string, List<Dictionary<string, object>>>>(jsonText);
}

/// <summary>
/// 将JSON文本转换成数据行
/// </summary>
/// <param name="jsonText">JSON文本</param>
/// <returns>数据行的字典</returns>
public static Dictionary<string, object> DataRowFromJson(string jsonText)
{
return JsonToObject<Dictionary<string, object>>(jsonText);
}
}
}

namespace Systemjson
{
/// <summary>
/// WebService1 的摘要说明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
// [System.Web.Script.Services.ScriptService]
public class WebService1 : System.Web.Services.WebService
{

[WebMethod]
public void HelloWorld()
{
UserModels user = new UserModels();
user.userId = 1;
user.userName = "11";
user.userPass = "111";
Context.Response.Write(JsonHelper.ObjectToJson(user));
Context.Response.End();
//不需要返回值
//return JsonHelper.ObjectToJson(user);
}
}
}