Asp.net 将DataTable 或者DataSet 转换为Json 格式

Web 开发中,将从数据库中取到的数据直接转换为 Json 格式的数据,在前台通过Ajax 无刷新显示在界面上,下面提供将DataTable 或者DataSet 转换为Json 的方法

 /// <summary>

    /// DataTable 转换成Json 操作类

    /// </summary>

    public  static class ConvertJson

    {

        #region  DataSet转换为Json



        /// <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 + "}";

        }

        #endregion



        #region Datatable转换为Json



        /// <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("]");

            return jsonString.ToString();

        }



        /// <summary>  

        /// DataTable转换为Json 

        /// </summary>    

        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].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();

        }



        #endregion



        /// <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))

            {

                str = String2Json(str);

                str = "\"" + str + "\"";

            }

            else if (type == typeof(DateTime))

            {

                str = "\"" + str + "\"";

            }

            else if (type == typeof(bool))

            {

                str = str.ToLower();

            }

            else if (type != typeof(string) && string.IsNullOrEmpty(str))

            {

                str = "\"" + str + "\"";

            }

            return str;

        }



        #region 私有方法

        /// <summary>     

        /// 过滤特殊字符    

        /// </summary>    

        /// <param name="s">字符串</param> 

        /// <returns>json字符串</returns> 

        private 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;

                    default:

                        sb.Append(c); break;

                }

            }

            return sb.ToString();

        }

        #endregion

    }

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