Json序列化和反序列化的类

/// <summary>
/// JSON帮助类。用于将对象转换为Json格式的字符串，或者将Json的字符串转化为对象。
/// </summary>
public static class JsonHelper
{
    /// <summary>
    /// 将对象转化为Json字符串 
    /// </summary>
    /// <typeparam name="T">源类型</typeparam>
    /// <param name="obj">源类型实例</param>
    /// <returns>Json字符串</returns>
    public static string GetJsonFromObj<T>(T obj)
    {
        DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(obj.GetType());
        using (MemoryStream ms = new MemoryStream())
        {
            jsonSerializer.WriteObject(ms, obj);
            return Encoding.UTF8.GetString(ms.ToArray());
        }
    }

    /// <summary>
    /// 将Json字符串转化为对象
    /// </summary>
    /// <typeparam name="T">目标类型</typeparam>
    /// <param name="strJson">Json字符串</param>
    /// <returns>目标类型的一个实例</returns>
    public static T GetObjFromJson<T>(string strJson)
    {
        T obj = Activator.CreateInstance<T>();
        using (MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(strJson)))
        {
            DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(obj.GetType());
            return (T)jsonSerializer.ReadObject(ms);
        }
    }

    /// <summary>
    /// 将DataTable转换为JSON字符串
    /// </summary>
    /// <param name="dt">数据表</param>
    /// <returns>JSON字符串</returns>
    public static string GetJsonFromDataTable(DataTable dt)
    {
        StringBuilder JsonString = new StringBuilder();
        if (dt != null && dt.Rows.Count > 0)
        {
            JsonString.Append("{ ");
            JsonString.Append("\"TableInfo\":[ ");
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                JsonString.Append("{ ");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    if (j < dt.Columns.Count - 1)
                    {
                        JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\",");
                    }
                    else if (j == dt.Columns.Count - 1)
                    {
                        JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + "\"" + dt.Rows[i][j].ToString() + "\"");
                    }
                }
                if (i == dt.Rows.Count - 1)
                {
                    JsonString.Append("} ");
                }
                else
                {
                    JsonString.Append("}, ");
                }
            }
            JsonString.Append("]}");
            return JsonString.ToString();
        }
        else
        {
            return null;
        }
    }

    /// <summary> 
    /// 将对象转化为Json字符串 
    /// </summary> 
    /// <param name="obj">源对象</param> 
    /// <returns>json数据</returns> 
    public static string ObjToJson(this object obj)
    {
        JavaScriptSerializer serialize = new JavaScriptSerializer();
        return serialize.Serialize(obj);
    }

    /// <summary> 
    /// 将Json字符串转化为对象
    /// </summary> 
    /// <param name="strJson">Json字符串</param> 
    /// <returns>目标对象</returns>
    public static T JsonToObj<T>(string strJson)
    {
        JavaScriptSerializer serialize = new JavaScriptSerializer();
        return serialize.Deserialize<T>(strJson);
    }

    /// <summary> 
    /// 将对象转化为Json字符串(控制深度 )
    /// </summary> 
    /// <param name="obj">源对象</param> 
    /// <param name="recursionDepth">深度</param> 
    /// <returns>json数据</returns> 
    public static string ObjToJson(this object obj, int recursionDepth)
    {
        JavaScriptSerializer serialize = new JavaScriptSerializer();
        serialize.RecursionLimit = recursionDepth;
        return serialize.Serialize(obj);
    }

    /// <summary> 
    /// 将Json字符串转化为对象(控制深度 )
    /// </summary> 
    /// <param name="strJson">Json字符串</param> 
    /// <param name="recursionDepth">深度</param> 
    /// <returns>目标对象</returns>
    public static T JsonToObj<T>(string strJson, int recursionDepth)
    {
        JavaScriptSerializer serialize = new JavaScriptSerializer();
        serialize.RecursionLimit = recursionDepth;
        return serialize.Deserialize<T>(strJson);
    }

    /// <summary> 
    /// 将DataTable转换为JSON字符串
    /// </summary> 
    /// <param name="dt">DataTable</param> 
    /// <returns>json数据</returns> 
    public static string DataTableToJson(DataTable dt)
    {
        Dictionary<string, object> dic = new Dictionary<string, object>();

        int index = 0;
        foreach (DataRow dr in dt.Rows)
        {
            Dictionary<string, object> result = new Dictionary<string, object>();

            foreach (DataColumn dc in dt.Columns)
            {
                result.Add(dc.ColumnName, dr[dc].ToString());
            }
            dic.Add(index.ToString(), result);
            index++;
        }
        return ObjToJson(dic);
    }
}

 调用代码

public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            //反序列化成对象     
            String strJson = "{\"Name\":\"Test123\",\"Url\":\"http://www.126.com/\"}";
            Person p1 = JsonHelper.GetObjFromJson<Person>(strJson);
            Response.Write("<li>" + p1.Name + " " + p1.Url);
            Person p2 = JsonHelper.JsonToObj<Person>(strJson);
            Response.Write("<li>" + p2.Name + " " + p2.Url);
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            //对象的序列化 
            String JSONString = string.Empty;
            Person p1 = new Person();
            p1.Name = "Test123'\"\n\r\t";
            p1.Url = "http://www.126.com/";
            JSONString = JsonHelper.GetJsonFromObj<Person>(p1);
            Response.Write("<li>" + JSONString);
            JSONString = JsonHelper.ObjToJson(p1);
            Response.Write("<li>" + JSONString);
        }
    }

    /// <summary> 
    /// 类对象需要标记为DataContractAttribute 
    /// </summary> 
    [DataContractAttribute]
    class Person
    {
        //成员需要标记为 DataMember 
        [DataMember]
        public string Name { set; get; }
        [DataMember]
        public string Url { set; get; }
    }