万能json转换

方案有两种：

第一种：转换类

   代码如下：

 

 public static class JsonHelper
    {

        /// <summary>
        /// List转成json
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="jsonName"></param>
        /// <param name="list"></param>
        /// <returns></returns>

        public static string ListToJson<T>(IList<T> list, string jsonName)
        {

            StringBuilder Json = new StringBuilder();
            if (string.IsNullOrEmpty(jsonName))
                jsonName = list[0].GetType().Name;

            Json.Append("{\"" + jsonName + "\":[");
            if (list.Count > 0)
            {
                for (int i = 0; i < list.Count; i++)
                {
                    T obj = Activator.CreateInstance<T>();
                    PropertyInfo[] pi = obj.GetType().GetProperties();
                    Json.Append("{");
                    #region MyRegion
                    for (int j = 0; j < pi.Length; j++)
                    {
                        Type type;
                        object o = pi[j].GetValue(list[i], null);
                        string v = string.Empty;
                        if (o != null)
                        {
                            type = o.GetType();
                            v = o.ToString();
                        }
                        else
                        {
                            type = typeof(string);
                        }
                        Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(v, type));

                        if (j < pi.Length - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    #endregion
                    Json.Append("}");

                    if (i < list.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }
        /// <summary>
        /// 序列化集合对象
        /// </summary>
        public static string JsonSerializerByArrayData<T>(T[] tArray)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T[]));
            MemoryStream ms = new MemoryStream();
            ser.WriteObject(ms, tArray);

            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();

            string p = @"\\/Date\((\d+)\+\d+\)\\/";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
            Regex reg = new Regex(p);
            jsonString = reg.Replace(jsonString, matchEvaluator);
            return jsonString;
        }
        /// <summary>
        /// 序列化单个对象
        /// </summary>
        public static string JsonSerializerBySingleData<T>(T t)
        {
            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream();
            ser.WriteObject(ms, t);

            string jsonString = Encoding.UTF8.GetString(ms.ToArray());
            ms.Close();
            string p = @"\\/Date\((\d+)\+\d+\)\\/";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertJsonDateToDateString);
            Regex reg = new Regex(p);
            jsonString = reg.Replace(jsonString, matchEvaluator);
            return jsonString;
        }
        /// <summary>
        /// 反序列化单个对象
        /// </summary>
        public static T JsonDeserializeBySingleData<T>(string jsonString)
        {
            //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式 
            string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);
            Regex reg = new Regex(p);

            jsonString = reg.Replace(jsonString, matchEvaluator);

            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));

            T obj = (T)ser.ReadObject(ms);
            return obj;
        }
        /// <summary>
        /// 反序列化集合对象
        /// </summary>
        public static T[] JsonDeserializeByArrayData<T>(string jsonString)
        {
            //将"yyyy-MM-dd HH:mm:ss"格式的字符串转为"\/Date(1294499956278+0800)\/"格式 
            string p = @"\d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}";
            MatchEvaluator matchEvaluator = new MatchEvaluator(ConvertDateStringToJsonDate);

            Regex reg = new Regex(p);

            jsonString = reg.Replace(jsonString, matchEvaluator);

            DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(T[]));
            MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString));

            T[] arrayObj = (T[])ser.ReadObject(ms);

            return arrayObj;
        }
        /// <summary>
        /// 将Json序列化的时间由/Date(1294499956278+0800)转为字符串
        /// </summary>
        private static string ConvertJsonDateToDateString(Match m)
        {
            string result = string.Empty;

            DateTime dt = new DateTime(1970, 1, 1);

            dt = dt.AddMilliseconds(long.Parse(m.Groups[1].Value));

            dt = dt.ToLocalTime();

            result = dt.ToString("yyyy-MM-dd HH:mm:ss");

            return result;
        }
        /// <summary> 
        /// 将时间字符串转为Json时间
        /// </summary>
        private static string ConvertDateStringToJsonDate(Match m)
        {

            string result = string.Empty;

            DateTime dt = DateTime.Parse(m.Groups[0].Value);

            dt = dt.ToUniversalTime();

            TimeSpan ts = dt - DateTime.Parse("1970-01-01");

            result = string.Format("\\/Date({0}+0800)\\/", ts.TotalMilliseconds);

            return result;
        }

        /// <summary>
        /// List转成json
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list"></param>
        /// <returns></returns>
        public static string ListToJson<T>(IList<T> list)
        {
            object obj = list[0];

            return ListToJson<T>(list, obj.GetType().Name);
        }

        /// <summary>
        /// 对象转换为Json字符串
        /// </summary>
        /// <param name="jsonObject">对象</param>
        /// <returns>Json字符串</returns>
        public static string ToJson(object jsonObject)
        {
            try
            {
                StringBuilder jsonString = new StringBuilder();

                jsonString.Append("{");

                PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();

                for (int i = 0; i < propertyInfo.Length; i++)
                {
                    object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);

                    if (objectValue == null)
                    {
                        continue;
                    }

                    StringBuilder value = new StringBuilder();

                    if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
                    {
                        value.Append("\"" + objectValue.ToString() + "\"");
                    }
                    else if (objectValue is string)
                    {
                        value.Append("\"" + objectValue.ToString() + "\"");
                    }
                    else if (objectValue is IEnumerable)
                    {
                        value.Append(ToJson((IEnumerable)objectValue));
                    }
                    else
                    {
                        value.Append("\"" + objectValue.ToString() + "\"");
                    }

                    jsonString.Append("\"" + propertyInfo[i].Name + "\":" + value + ",");
                }
                return jsonString.ToString().TrimEnd(',') + "}";
            }
            catch (Exception ex)
            {
                throw ex;

            }
        }

        /// <summary>
        /// 对象集合转换Json
        /// </summary>
        /// <param name="array">集合对象</param>
        /// <returns>Json字符串</returns>
        public static string ToJson(IEnumerable array)
        {
            string jsonString = "[";

            foreach (object item in array)
            {
                jsonString += ToJson(item) + ",";
            }

            if (jsonString.Length > 1)
            {
                jsonString.Remove(jsonString.Length - 1, jsonString.Length);
            }
            else
            {

                jsonString = "[]";
            }

            return jsonString + "]";
        }

        /// <summary>
        /// 普通集合转换Json
        /// </summary>
        /// <param name="array">集合对象</param>
        /// <returns>Json字符串</returns>
        public static string ToArrayString(IEnumerable array)
        {
            string jsonString = "[";

            foreach (object item in array)
            {

                jsonString = ToJson(item.ToString()) + ",";

            }

            jsonString.Remove(jsonString.Length - 1, jsonString.Length);

            return jsonString + "]";
        }

        /// <summary>
        /// Datatable转换为Json
        /// </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 = 0; i < drc.Count; i++)
            {

                jsonString.Append("{");

                for (int j = 0; 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 - 1)
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }

                jsonString.Append("},");
            }

            jsonString.Remove(jsonString.Length - 1, 1);

            jsonString.Append("]");

            if (jsonString.Length == 1)
            {
                return "[]";
            }
            return jsonString.ToString();
        }

        /// <summary>
        /// DataTable转成Json
        /// </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 > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {

                    Json.Append("{");

                    for (int j = 0; 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 - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");

                    if (i < dt.Rows.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }

            Json.Append("]}");

            return Json.ToString();
        }

 

        /// <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 = 0; 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 - 1)
                        {
                            jsonString.Append(strValue + ",");
                        }
                        else
                        {
                            jsonString.Append(strValue);
                        }
                    }

                    jsonString.Append("},");
                }

                if (!dataReader.IsClosed)
                {
                    dataReader.Close();
                }
                jsonString.Remove(jsonString.Length - 1, 1);

                jsonString.Append("]");

                if (jsonString.Length == 1)
                {
                    return "[]";
                }

                return jsonString.ToString();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// DataSet转换为Json
        /// </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>
        /// 过滤特殊字符       
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>

        public static string String2Json(String s)
        {
            StringBuilder sb = new StringBuilder();

            for (int i = 0; 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();
        }

        /// <summary>
        /// 格式化字符型、日期型、布尔型
        /// </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;
        }

        public static void RegistAjax(HtmlHead Header, Type type)
        {

            string assemblyName = type.FullName + "," + type.Assembly.FullName.Substring(0, type.Assembly.FullName.IndexOf(","));

            if (type.Assembly.FullName.StartsWith("App_Code."))
            {
                assemblyName = type.FullName + ",App_Code";
            }

            Literal l = new Literal();

            l.Text = "\n<script type=\"text/javascript\" src=\"/ajaxpro/prototype.ashx\"></script>\n"

            + "<script type=\"text/javascript\" src=\"/ajaxpro/core.ashx\"></script>\n"

            + "<script type=\"text/javascript\" src=\"/ajaxpro/converter.ashx\"></script>\n"

            + "<script type=\"text/javascript\" src=\"/ajaxpro/" + assemblyName + ".ashx\"></script>\n";

            Header.Controls.Add(l);
        }

    }

第二种：Newtonsoft.Json.dll

   使用方法见附件：