【C#公共帮助类】JsonHelper 操作帮助类， 以后再也不用满地找Json了，拿来直接用

 四个主要操作类：JsonConverter 、JsonHelper 、JsonSplit 、AjaxResult

一、JsonConverter：

自定义查询对象转换动态类、object动态类转换json包、json转换object动态类、DataReader转换为Json、DataSet转换为Json、DataTable转成Json、Datatable转换为Json 、格式化字符型日期型布尔型、过滤特殊字符等

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Linq;
using System.Web.Script.Serialization;
using System.Collections;

namespace Common
{
    public class JsonConverter
    {

        /// <summary>
        /// 自定义查询对象转换动态类
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static dynamic JsonClass(object obj)
        {
            return ConvertJson(Serialize(obj, true));
        }

        /// <summary>
        /// object动态类转换json包
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="obj">对象</param>
        /// <param name="DateConvert">时间戳是否转换成日期类型</param>
        /// <returns></returns>
        public static string Serialize(object obj, bool DateConvert = false)
        {
            JavaScriptSerializer jss = new JavaScriptSerializer();
            var str = jss.Serialize(obj);
            if (DateConvert)
            {
                str = System.Text.RegularExpressions.Regex.Replace(str, @"\\/Date\((\d+)\)\\/", match =>
                {
                    DateTime dt = new DateTime(, , );
                    dt = dt.AddMilliseconds(long.Parse(match.Groups[].Value));
                    dt = dt.ToLocalTime();
                    return dt.ToString("yyyy-MM-dd HH:mm:ss");
                });
            }
            return str;
        }

        /// <summary>
        /// json转换object动态类
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="json"></param>
        /// <returns></returns>
        public static dynamic ConvertJson(string json)
        {
            JavaScriptSerializer jss = new JavaScriptSerializer();
            jss.RegisterConverters(new JavaScriptConverter[] { new DynamicJsonConverter() });
            dynamic dy = jss.Deserialize(json, typeof(object)) as dynamic;
            return dy;
        }

        /// <summary>
        /// DataReader转换为Json
        /// </summary>
        /// <param name="dataReader">DataReader对象</param>
        /// <returns>Json字符串</returns>
        public static string ToJson(IDataReader dataReader)
        {
            try
            {
                StringBuilder jsonString = new StringBuilder();
                jsonString.Append("[");

                while (dataReader.Read())
                {
                    jsonString.Append("{");
                    for (int i = ; i < dataReader.FieldCount; i++)
                    {
                        Type type = dataReader.GetFieldType(i);
                        string strKey = dataReader.GetName(i);
                        string strValue = dataReader[i].ToString();
                        jsonString.Append("\"" + strKey + "\":");
                        strValue = StringFormat(strValue, type);
                        if (i < dataReader.FieldCount - )
                        {
                            jsonString.Append(strValue + ",");
                        }
                        else
                        {
                            jsonString.Append(strValue);
                        }
                    }
                    jsonString.Append("},");
                }
                if (!dataReader.IsClosed)
                {
                    dataReader.Close();
                }
                jsonString.Remove(jsonString.Length - , );
                jsonString.Append("]");
                if (jsonString.Length == )
                {
                    return "[]";
                }
                return jsonString.ToString();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// DataSet转换为Json
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="dataSet">DataSet对象</param>
        /// <returns>Json字符串</returns>
        public static string ToJson(DataSet dataSet)
        {
            string jsonString = "{";
            foreach (DataTable table in dataSet.Tables)
            {
                jsonString += "\"" + table.TableName + "\":" + ToJson(table) + ",";
            }
            jsonString = jsonString.TrimEnd(',');
            return jsonString + "}";
        }
        /// <summary>
        /// DataTable转成Json
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="jsonName"></param>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static string ToJson(DataTable dt, string jsonName)
        {
            StringBuilder Json = new StringBuilder();
            if (string.IsNullOrEmpty(jsonName))
                jsonName = dt.TableName;
            Json.Append("{\"" + jsonName + "\":[");
            if (dt.Rows.Count > )
            {
                for (int i = ; i < dt.Rows.Count; i++)
                {
                    Json.Append("{");
                    for (int j = ; j < dt.Columns.Count; j++)
                    {
                        Type type = dt.Rows[i][j].GetType();
                        Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":" + StringFormat(dt.Rows[i][j] is DBNull ? string.Empty : dt.Rows[i][j].ToString(), type));
                        if (j < dt.Columns.Count - )
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < dt.Rows.Count - )
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }
        /// <summary>
        /// Datatable转换为Json
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="table">Datatable对象</param>
        /// <returns>Json字符串</returns>
        public static string ToJson(DataTable dt)
        {
            StringBuilder jsonString = new StringBuilder();
            jsonString.Append("[");
            DataRowCollection drc = dt.Rows;
            for (int i = ; i < drc.Count; i++)
            {
                jsonString.Append("{");
                for (int j = ; j < dt.Columns.Count; j++)
                {
                    string strKey = dt.Columns[j].ColumnName;
                    string strValue = drc[i][j].ToString();
                    Type type = dt.Columns[j].DataType;
                    jsonString.Append("\"" + strKey + "\":");
                    strValue = StringFormat(strValue, type);
                    if (j < dt.Columns.Count - )
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }
                jsonString.Append("},");
            }
            jsonString.Remove(jsonString.Length - , );
            jsonString.Append("]");
            if (jsonString.Length == )
            {
                return "[]";
            }
            return jsonString.ToString();
        }
        /// <summary>
        /// 格式化字符型、日期型、布尔型
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="str"></param>
        /// <param name="type"></param>
        /// <returns></returns>
        private static string StringFormat(string str, Type type)
        {
            if (type != typeof(string) && string.IsNullOrEmpty(str))
            {
                str = "\"" + str + "\"";
            }
            else if (type == typeof(string))
            {
                str = String2Json(str);
                str = "\"" + str + "\"";
            }
            else if (type == typeof(DateTime))
            {
                str = "\"" + str + "\"";
            }
            else if (type == typeof(bool))
            {
                str = str.ToLower();
            }
            else if (type == typeof(byte[]))
            {
                str = "\"" + str + "\"";
            }
            else if (type == typeof(Guid))
            {
                str = "\"" + str + "\"";
            }
            return str;
        }
        /// <summary>
        /// 过滤特殊字符
        /// add yuangang by 2015-05-19
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string String2Json(String s)
        {
            StringBuilder sb = new StringBuilder();
            for (int i = ; i < s.Length; i++)
            {
                char c = s.ToCharArray()[i];
                switch (c)
                {
                    case '\"':
                        sb.Append("\\\""); break;
                    case '\\':
                        sb.Append("\\\\"); break;
                    case '/':
                        sb.Append("\\/"); break;
                    case '\b':
                        sb.Append("\\b"); break;
                    case '\f':
                        sb.Append("\\f"); break;
                    case '\n':
                        sb.Append("\\n"); break;
                    case '\r':
                        sb.Append("\\r"); break;
                    case '\t':
                        sb.Append("\\t"); break;
                    case '\v':
                        sb.Append("\\v"); break;
                    case '\0':
                        sb.Append("\\0"); break;
                    default:
                        sb.Append(c); break;
                }
            }
            return sb.ToString();
        }

        public static string GetDataGridJsonByDataSet(DataSet ds, string totalProperty, string root)
        {
            return GetDataGridJsonByDataTable(ds.Tables[], totalProperty, root);
        }
        public static string GetDataGridJsonByDataTable(DataTable dt, string totalProperty, string root)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("({\"" + totalProperty + "\":\"" + dt.Rows.Count + "\",");
            jsonBuilder.Append("\"");
            jsonBuilder.Append(root);
            jsonBuilder.Append("\":[");
            for (int i = ; i < dt.Rows.Count; i++)
            {
                jsonBuilder.Append("{");
                for (int j = ; 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 - , );
                jsonBuilder.Append("},");
            }
            jsonBuilder.Remove(jsonBuilder.Length - , );
            jsonBuilder.Append("]");
            jsonBuilder.Append("})");
            return jsonBuilder.ToString();
        }

        public static string GetTreeJsonByDataSet(DataSet ds)
        {
            return GetTreeJsonByDataTable(ds.Tables[]);
        }
        public static string GetTreeJsonByDataTable(DataTable dataTable)
        {
            DataTable dt = FormatDataTableForTree(dataTable);
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("[");
            for (int i = ; i < dt.Rows.Count; i++)
            {
                jsonBuilder.Append("{");
                for (int j = ; j < dt.Columns.Count; j++)
                {
                    jsonBuilder.Append("\'");

                    if (dt.Columns[j].ColumnName == "leaf")
                    {
                        string leafValue = dt.Rows[i][j].ToString();

                        if (!string.IsNullOrEmpty(leafValue))
                        {
                            jsonBuilder.Append(dt.Columns[j].ColumnName);
                            jsonBuilder.Append("\':\'");
                            jsonBuilder.Append(dt.Rows[i][j].ToString());
                            jsonBuilder.Append("\',");
                        }
                        else
                        {
                            jsonBuilder.Remove(jsonBuilder.Length - , );
                        }
                    }
                    else if (dt.Columns[j].ColumnName == "customUrl")
                    {
                        jsonBuilder.Remove(jsonBuilder.Length - , );
                        jsonBuilder.Append(dt.Columns[j].ColumnName);
                        jsonBuilder.Append(":\'");
                        jsonBuilder.Append(dt.Rows[i][j].ToString());
                        jsonBuilder.Append("\',");
                    }
                    else
                    {
                        jsonBuilder.Append(dt.Columns[j].ColumnName);
                        jsonBuilder.Append("\':\'");
                        jsonBuilder.Append(dt.Rows[i][j].ToString());
                        jsonBuilder.Append("\',");
                    }

                }
                jsonBuilder.Remove(jsonBuilder.Length - , );
                jsonBuilder.Append("},");
            }
            jsonBuilder.Remove(jsonBuilder.Length - , );
            jsonBuilder.Append("]");
            return jsonBuilder.ToString();
        }
        private static DataTable FormatDataTableForTree(DataTable dt)
        {
            DataTable dtTree = new DataTable();
            dtTree.Columns.Add("id", typeof(string));
            dtTree.Columns.Add("text", typeof(string));
            dtTree.Columns.Add("leaf", typeof(string));
            dtTree.Columns.Add("cls", typeof(string));
            dtTree.Columns.Add("customUrl", typeof(string));
            dtTree.AcceptChanges();

            for (int i = ; i < dt.Rows.Count; i++)
            {
                DataRow drTree = dtTree.NewRow();
                drTree["id"] = dt.Rows[i]["id"].ToString();
                drTree["text"] = dt.Rows[i]["text"].ToString();
                if (dt.Rows[i]["leaf"].ToString() == "Y")
                {
                    drTree["leaf"] = "true";
                    drTree["cls"] = "file";
                }
                else
                {
                    drTree["cls"] = "folder";
                }
                drTree["customUrl"] = dt.Rows[i]["customUrl"].ToString();
                dtTree.Rows.Add(drTree);
            }
            return dtTree;
        }

    }
    /// <summary>
    /// 动态JSON解析
    /// add yuangang by 2015-05-19
    /// </summary>
    public class DynamicJsonObject : System.Dynamic.DynamicObject
    {
        private IDictionary<string, object> Dictionary { get; set; }

        public DynamicJsonObject(IDictionary<string, object> dictionary)
        {
            this.Dictionary = dictionary;
        }

        public override bool TryGetMember(System.Dynamic.GetMemberBinder binder, out object result)
        {
            result = this.Dictionary[binder.Name];

            if (result is IDictionary<string, object>)
            {
                result = new DynamicJsonObject(result as IDictionary<string, object>);
            }
            else if (result is ArrayList && (result as ArrayList) is IDictionary<string, object>)
            {
                result = new List<DynamicJsonObject>((result as ArrayList).ToArray().Select(x => new DynamicJsonObject(x as IDictionary<string, object>)));
            }
            else if (result is ArrayList)
            {
                result = new List<object>((result as ArrayList).ToArray());
            }

            return this.Dictionary.ContainsKey(binder.Name);
        }
    }
    /// <summary>
    /// 动态JSON转换
    /// add yuangang by 2015-05-19
    /// </summary>
    public class DynamicJsonConverter : JavaScriptConverter
    {
        public override object Deserialize(IDictionary<string, object> dictionary, Type type, JavaScriptSerializer serializer)
        {
            if (dictionary == null)
                throw new ArgumentNullException("dictionary");

            if (type == typeof(object))
            {
                return new DynamicJsonObject(dictionary);
            }

            return null;
        }

        public override IDictionary<string, object> Serialize(object obj, JavaScriptSerializer serializer)
        {
            throw new NotImplementedException();
        }

        public override IEnumerable<Type> SupportedTypes
        {
            get { return new System.Collections.ObjectModel.ReadOnlyCollection<Type>(new List<Type>(new Type[] { typeof(object) })); }
        }
    }
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

二、JsonHelper：json的辅助类

using System.Collections.Generic;
using System.Text;
using Newtonsoft.Json;
using System.Runtime.Serialization.Json;
using System.IO;

namespace Common
{

    /// <summary>
    /// 提供了一个关于json的辅助类
    /// </summary>
    public class JsonHelper
    {
        #region Method
        /// <summary>
        /// 类对像转换成json格式
        /// </summary>
        /// <returns></returns>
        public static string ToJson(object t)
        {
          return JsonConvert.SerializeObject(t, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Include });
        }
        /// <summary>
        /// 类对像转换成json格式
        /// </summary>
        /// <param name="t"></param>
        /// <param name="HasNullIgnore">是否忽略NULL值</param>
        /// <returns></returns>
        public static string ToJson(object t, bool HasNullIgnore)
        {
            if (HasNullIgnore)
                return JsonConvert.SerializeObject(t, Newtonsoft.Json.Formatting.Indented, new JsonSerializerSettings { NullValueHandling = NullValueHandling.Ignore });
            else
                return ToJson(t);
        }
        /// <summary>
        /// json格式转换
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="strJson"></param>
        /// <returns></returns>
        public static T FromJson<T>(string strJson) where T : class
        {
            if (!strJson.IsNullOrEmpty())
                return JsonConvert.DeserializeObject<T>(strJson);
            return null;
        }
        /// <summary>
        /// 功能描述：将List转换为Json
        /// </summary>
        /// <param name="a"></param>
        /// <returns></returns>
        public static string ListToJson(IList<object> a)
        {

            DataContractJsonSerializer json = new DataContractJsonSerializer(a.GetType());
            string szJson = "";
            //序列化
            using (MemoryStream stream = new MemoryStream())
            {
                json.WriteObject(stream, a);
                szJson = Encoding.UTF8.GetString(stream.ToArray());
            }
            return szJson;
        }
        #endregion

        #region Property
        /// <summary>
        /// 数据状态
        /// </summary>
        public string Status { get; set; }
        /// <summary>
        /// 提示信息
        /// </summary>
        public string Msg { get; set; }
        /// <summary>
        /// 回传URL
        /// </summary>
        public string ReUrl { get; set; }
        /// <summary>
        /// 数据包
        /// </summary>
        public object Data { get; set; }
        #endregion

    }
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

三、JsonSplit：判断字符串是否为Json

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace Common
{
    /// <summary>
    /// 判断字符串是否为JSON
    /// </summary>
    public class JsonSplit
    {
        private static bool IsJsonStart(ref string json)
        {
            if (!string.IsNullOrEmpty(json))
            {
                json = json.Trim('\r', '\n', ' ');
                if (json.Length > )
                {
                    char s = json[];
                    char e = json[json.Length - ];
                    return (s == '{' && e == '}') || (s == '[' && e == ']');
                }
            }
            return false;
        }
        public static bool IsJson(string json)
        {
            int errIndex;
            return IsJson(json, out errIndex);
        }
        public static bool IsJson(string json, out int errIndex)
        {
            errIndex = ;
            if (IsJsonStart(ref json))
            {
                CharState cs = new CharState();
                char c;
                for (int i = ; i < json.Length; i++)
                {
                    c = json[i];
                    if (SetCharState(c, ref cs) && cs.childrenStart)//设置关键符号状态。
                    {
                        string item = json.Substring(i);
                        int err;
                        int length = GetValueLength(item, true, out err);
                        cs.childrenStart = false;
                        if (err > )
                        {
                            errIndex = i + err;
                            return false;
                        }
                        i = i + length - ;
                    }
                    if (cs.isError)
                    {
                        errIndex = i;
                        return false;
                    }
                }

                return !cs.arrayStart && !cs.jsonStart;
            }
            return false;
        }

        /// <summary>
        /// 获取值的长度（当Json值嵌套以"{"或"["开头时）
        /// </summary>
        private static int GetValueLength(string json, bool breakOnErr, out int errIndex)
        {
            errIndex = ;
            int len = ;
            if (!string.IsNullOrEmpty(json))
            {
                CharState cs = new CharState();
                char c;
                for (int i = ; i < json.Length; i++)
                {
                    c = json[i];
                    if (!SetCharState(c, ref cs))//设置关键符号状态。
                    {
                        if (!cs.jsonStart && !cs.arrayStart)//json结束，又不是数组，则退出。
                        {
                            break;
                        }
                    }
                    else if (cs.childrenStart)//正常字符，值状态下。
                    {
                        int length = GetValueLength(json.Substring(i), breakOnErr, out errIndex);//递归子值，返回一个长度。。。
                        cs.childrenStart = false;
                        cs.valueStart = ;
                        //cs.state = 0;
                        i = i + length - ;
                    }
                    if (breakOnErr && cs.isError)
                    {
                        errIndex = i;
                        return i;
                    }
                    if (!cs.jsonStart && !cs.arrayStart)//记录当前结束位置。
                    {
                        len = i + ;//长度比索引+1
                        break;
                    }
                }
            }
            return len;
        }
        /// <summary>
        /// 字符状态
        /// </summary>
        private class CharState
        {
            internal bool jsonStart = false;//以 "{"开始了...
            internal bool setDicValue = false;// 可以设置字典值了。
            internal bool escapeChar = false;//以"\"转义符号开始了
            /// <summary>
            /// 数组开始【仅第一开头才算】，值嵌套的以【childrenStart】来标识。
            /// </summary>
            internal bool arrayStart = false;//以"[" 符号开始了
            internal bool childrenStart = false;//子级嵌套开始了。
            /// <summary>
            /// 【0 初始状态，或 遇到“,”逗号】；【1 遇到“：”冒号】
            /// </summary>
            internal int state = ;

            /// <summary>
            /// 【-1 取值结束】【0 未开始】【1 无引号开始】【2 单引号开始】【3 双引号开始】
            /// </summary>
            internal int keyStart = ;
            /// <summary>
            /// 【-1 取值结束】【0 未开始】【1 无引号开始】【2 单引号开始】【3 双引号开始】
            /// </summary>
            internal int valueStart = ;
            internal bool isError = false;//是否语法错误。

            internal void CheckIsError(char c)//只当成一级处理（因为GetLength会递归到每一个子项处理）
            {
                if (keyStart >  || valueStart > )
                {
                    return;
                }
                //示例 ["aa",{"bbbb":123,"fff","ddd"}]
                switch (c)
                {
                    case '{'://[{ "[{A}]":[{"[{B}]":3,"m":"C"}]}]
                        isError = jsonStart && state == ;//重复开始错误 同时不是值处理。
                        break;
                    case '}':
                        isError = !jsonStart || (keyStart !=  && state == );//重复结束错误 或者 提前结束{"aa"}。正常的有{}
                        break;
                    case '[':
                        isError = arrayStart && state == ;//重复开始错误
                        break;
                    case ']':
                        isError = !arrayStart || jsonStart;//重复开始错误 或者 Json 未结束
                        break;
                    case '"':
                    case '\'':
                        isError = !(jsonStart || arrayStart); //json 或数组开始。
                        if (!isError)
                        {
                            //重复开始 [""",{"" "}]
                            isError = (state ==  && keyStart == -) || (state ==  && valueStart == -);
                        }
                        if (!isError && arrayStart && !jsonStart && c == '\'')//['aa',{}]
                        {
                            isError = true;
                        }
                        break;
                    case ':':
                        isError = !jsonStart || state == ;//重复出现。
                        break;
                    case ',':
                        isError = !(jsonStart || arrayStart); //json 或数组开始。
                        if (!isError)
                        {
                            if (jsonStart)
                            {
                                isError = state ==  || (state ==  && valueStart > );//重复出现。
                            }
                            else if (arrayStart)//["aa,] [,]  [{},{}]
                            {
                                isError = keyStart ==  && !setDicValue;
                            }
                        }
                        break;
                    case ' ':
                    case '\r':
                    case '\n'://[ "a",\r\n{} ]
                    case '\0':
                    case '\t':
                        break;
                    default: //值开头。。
                        isError = (!jsonStart && !arrayStart) || (state ==  && keyStart == -) || (valueStart == - && state == );//
                        break;
                }
                //if (isError)
                //{

                //}
            }
        }
        /// <summary>
        /// 设置字符状态(返回true则为关键词，返回false则当为普通字符处理）
        /// </summary>
        private static bool SetCharState(char c, ref CharState cs)
        {
            cs.CheckIsError(c);
            switch (c)
            {
                case '{'://[{ "[{A}]":[{"[{B}]":3,"m":"C"}]}]
                    #region 大括号
                    if (cs.keyStart <=  && cs.valueStart <= )
                    {
                        cs.keyStart = ;
                        cs.valueStart = ;
                        if (cs.jsonStart && cs.state == )
                        {
                            cs.childrenStart = true;
                        }
                        else
                        {
                            cs.state = ;
                        }
                        cs.jsonStart = true;//开始。
                        return true;
                    }
                    #endregion
                    break;
                case '}':
                    #region 大括号结束
                    if (cs.keyStart <=  && cs.valueStart <  && cs.jsonStart)
                    {
                        cs.jsonStart = false;//正常结束。
                        cs.state = ;
                        cs.keyStart = ;
                        cs.valueStart = ;
                        cs.setDicValue = true;
                        return true;
                    }
                    // cs.isError = !cs.jsonStart && cs.state == 0;
                    #endregion
                    break;
                case '[':
                    #region 中括号开始
                    if (!cs.jsonStart)
                    {
                        cs.arrayStart = true;
                        return true;
                    }
                    else if (cs.jsonStart && cs.state == )
                    {
                        cs.childrenStart = true;
                        return true;
                    }
                    #endregion
                    break;
                case ']':
                    #region 中括号结束
                    if (cs.arrayStart && !cs.jsonStart && cs.keyStart <=  && cs.valueStart <= )//[{},333]//这样结束。
                    {
                        cs.keyStart = ;
                        cs.valueStart = ;
                        cs.arrayStart = false;
                        return true;
                    }
                    #endregion
                    break;
                case '"':
                case '\'':
                    #region 引号
                    if (cs.jsonStart || cs.arrayStart)
                    {
                        if (cs.state == )//key阶段,有可能是数组["aa",{}]
                        {
                            if (cs.keyStart <= )
                            {
                                cs.keyStart = (c == '"' ?  : );
                                return true;
                            }
                            else if ((cs.keyStart ==  && c == '\'') || (cs.keyStart ==  && c == '"'))
                            {
                                if (!cs.escapeChar)
                                {
                                    cs.keyStart = -;
                                    return true;
                                }
                                else
                                {
                                    cs.escapeChar = false;
                                }
                            }
                        }
                        else if (cs.state ==  && cs.jsonStart)//值阶段必须是Json开始了。
                        {
                            if (cs.valueStart <= )
                            {
                                cs.valueStart = (c == '"' ?  : );
                                return true;
                            }
                            else if ((cs.valueStart ==  && c == '\'') || (cs.valueStart ==  && c == '"'))
                            {
                                if (!cs.escapeChar)
                                {
                                    cs.valueStart = -;
                                    return true;
                                }
                                else
                                {
                                    cs.escapeChar = false;
                                }
                            }

                        }
                    }
                    #endregion
                    break;
                case ':':
                    #region 冒号
                    if (cs.jsonStart && cs.keyStart <  && cs.valueStart <  && cs.state == )
                    {
                        if (cs.keyStart == )
                        {
                            cs.keyStart = -;
                        }
                        cs.state = ;
                        return true;
                    }
                    // cs.isError = !cs.jsonStart || (cs.keyStart < 2 && cs.valueStart < 2 && cs.state == 1);
                    #endregion
                    break;
                case ',':
                    #region 逗号 //["aa",{aa:12,}]

                    if (cs.jsonStart)
                    {
                        if (cs.keyStart <  && cs.valueStart <  && cs.state == )
                        {
                            cs.state = ;
                            cs.keyStart = ;
                            cs.valueStart = ;
                            //if (cs.valueStart == 1)
                            //{
                            //    cs.valueStart = 0;
                            //}
                            cs.setDicValue = true;
                            return true;
                        }
                    }
                    else if (cs.arrayStart && cs.keyStart <= )
                    {
                        cs.keyStart = ;
                        //if (cs.keyStart == 1)
                        //{
                        //    cs.keyStart = -1;
                        //}
                        return true;
                    }
                    #endregion
                    break;
                case ' ':
                case '\r':
                case '\n'://[ "a",\r\n{} ]
                case '\0':
                case '\t':
                    if (cs.keyStart <=  && cs.valueStart <= ) //cs.jsonStart &&
                    {
                        return true;//跳过空格。
                    }
                    break;
                default: //值开头。。
                    if (c == '\\') //转义符号
                    {
                        if (cs.escapeChar)
                        {
                            cs.escapeChar = false;
                        }
                        else
                        {
                            cs.escapeChar = true;
                            return true;
                        }
                    }
                    else
                    {
                        cs.escapeChar = false;
                    }
                    if (cs.jsonStart || cs.arrayStart) // Json 或数组开始了。
                    {
                        if (cs.keyStart <=  && cs.state == )
                        {
                            cs.keyStart = ;//无引号的
                        }
                        else if (cs.valueStart <=  && cs.state ==  && cs.jsonStart)//只有Json开始才有值。
                        {
                            cs.valueStart = ;//无引号的
                        }
                    }
                    break;
            }
            return false;
        }
    }
}

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

四、AjaxResult：前台Ajax请求的统一返回结果类

using System.Web.Script.Serialization;
namespace Common
{
    /// <summary>
    /// 前台Ajax请求的统一返回结果类
    /// </summary>
    public class AjaxResult
    {
        private AjaxResult()
        {
        }

        private bool iserror = false;

        /// <summary>
        /// 是否产生错误
        /// </summary>
        public bool IsError { get { return iserror; } }

        /// <summary>
        /// 错误信息，或者成功信息
        /// </summary>
        public string Message { get; set; }

        /// <summary>
        /// 成功可能时返回的数据
        /// </summary>
        public object Data { get; set; }

        #region Error
        public static AjaxResult Error()
        {
            return new AjaxResult()
            {
                iserror = true
            };
        }
        public static AjaxResult Error(string message)
        {
            return new AjaxResult()
            {
                iserror = true,
                Message = message
            };
        }
        #endregion

        #region Success
        public static AjaxResult Success()
        {
            return new AjaxResult()
            {
                iserror = false
            };
        }
        public static AjaxResult Success(string message)
        {
            return new AjaxResult()
            {
                iserror = false,
                Message = message
            };
        }
        public static AjaxResult Success(object data)
        {
            return new AjaxResult()
            {
                iserror = false,
                Data = data
            };
        }
        public static AjaxResult Success(object data, string message)
        {
            return new AjaxResult()
            {
                iserror = false,
                Data = data,
                Message = message
            };
        }
        #endregion

        /// <summary>
        /// 序列化
        /// </summary>
        /// <returns></returns>
        public override string ToString()
        {
            return new JavaScriptSerializer().Serialize(this);
        }
    }
}

常用的一些Json操作类，留备。会继续为大家分享一些 常用的 公共帮助类。

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