关于asp.net是用json

Question

asp.net中使用json要导入什么命名空间。最好给我一个操作的截图和代码。（如要用到下面这个
     new System.Web.Script.Serialization.JavaScriptSerializer().Serialize 要导入什么命名空间）谢了

Answer 1

jsonhelper.cs
ublic class JSONHelper
{
    //对应JSON的singleInfo成员
    public string singleInfo = string.Empty;
    protected string _error = string.Empty;
    protected bool _success = true;
    protected long _totalCount = 0;
    protected System.Collections.ArrayList arrData = new ArrayList();
    protected System.Collections.ArrayList arrDataItem = new ArrayList();
    public JSONHelper()
    {    }    //public static string ToJSON(object obj)
    //{
    //    JavaScriptSerializer serializer = new JavaScriptSerializer();
    //    return serializer.Serialize(obj);
    //}    //public static string ToJSON(object obj, int recursionDepth)
    //{
    //    JavaScriptSerializer serializer = new JavaScriptSerializer();
    //    serializer.RecursionLimit = recursionDepth;
    //    return serializer.Serialize(obj);
    //}    //对应于JSON的success成员
    public bool success
    {
        get
        {
            return _success;
        }
        set
        {
            //如设置为true则清空error
            if (success) _error = string.Empty;
            _success = value;
        }
    }    //对应于JSON的error成员
    public string error
    {
        get
        {
            return _error;
        }
        set
        {
            //如设置error，则自动设置success为false
            if (value != "") _success = false;
            _error = value;
        }
    }    public long totlalCount
    {
        get { return _totalCount; }
        set { _totalCount = value; }
    }
    //重置，每次新生成一个json对象时必须执行该方法
    public void Reset()
    {
        _success = true;
        _error = string.Empty;
        singleInfo = string.Empty;
        arrData.Clear();
        arrDataItem.Clear();
    }    public void AddItem(string name, string value)
    {
        arrData.Add("\"" + name + "\":" + "\"" + value + "\"");
    }    public void ItemOk()
    {
        arrData.Add("<BR>");
        totlalCount++;
    }    //序列化JSON对象，得到返回的JSON代码
    public override string ToString()
    {
        StringBuilder sb = new StringBuilder();
        sb.Append("{");
        sb.Append("totalCount:" + totlalCount.ToString() + ",");
        sb.Append("success:" + _success.ToString().ToLower() + ",");
        sb.Append("error:\"" + _error.Replace("\"", "\\\"") + "\",");
        sb.Append("singleInfo:\"" + singleInfo.Replace("\"", "\\\"") + "\",");
        sb.Append("data:[");        int index = 0;
        sb.Append("{");
        if (arrData.Count <= 0)
        {
            sb.Append("}]");
        }
        else
        {
            foreach (string val in arrData)
            {
                index++;                if (val != "<BR>")
                {
                    sb.Append(val + ",");
                }
                else
                {
                    sb = sb.Replace(",", "", sb.Length - 1, 1);
                    sb.Append("},");
                    if (index < arrData.Count)
                    {
                        sb.Append("{");
                    }
                }            }
            sb = sb.Replace(",", "", sb.Length - 1, 1);
            sb.Append("]");
        }        sb.Append("}");
        return sb.ToString();
    }
}

Answer 2

static T Deserialize <T>(string json) 
        { 
            T obj = Activator.CreateInstance <T>(); 
            using (MemoryStream ms = 
new MemoryStream(Encoding.UTF8.GetBytes(json))) 
            { 
      System.Runtime.Serialization.Json.DataContractJsonSerializer serializer = 
new System.Runtime.Serialization.Json.DataContractJsonSerializer(obj.GetType()); 
                return (T)serializer.ReadObject(ms); 
            } 
        } 

Answer 3

asp.net后台要操作json格式的数据需要
Newtonsoft.Json.dll动态库，网上搜得到
使用方法和操作xml类似后面一个问题不知道