using System;using System.Collections.Generic;using System.Collections;using System.Text;using System.Data;using System.Reflection;using System.Data.Common;namespace ZGZY.Common{    /// 
    /// JSON帮助类    /// 
    public class JsonHelper    {        #region 通用方法        /// 
        /// 格式化字符型、日期型、布尔型        /// 
        public static string StringFormat(string str, Type type)        {            if (type == typeof(string))            {                str = StringFilter(str);                str = "\"" + str + "\"";            }            else if (type == typeof(DateTime) || type == typeof(DateTime?))            {                str = "\"" + str + "\"";            }            else if (type == typeof(bool))            {                str = str.ToLower();            }            else if (type == typeof(Guid))            {                str = "\"" + str + "\"";            }            else if (type != typeof(string) && string.IsNullOrEmpty(str))            {                str = "\"" + str + "\"";            }            return str;        }        /// 
        /// 过滤字符串        /// 
        public static string StringFilter(string str)        {            StringBuilder sb = new StringBuilder();            for (int i = 0; i < str.Length; i++)            {                char c = str.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        #region 列转json        /// 
        /// 列转json        /// 
        /// 表        /// 列        public static string ColumnToJson(DataTable dt, int r)        {            StringBuilder strSql = new StringBuilder();            for (int i = 0; i < dt.Rows.Count; i++)            {                strSql.Append(dt.Rows[i][r]);                strSql.Append(",");            }            return strSql.ToString().Trim(',');        }        #endregion        #region 对象转json        /// 
        /// 对象转json        /// 
        public static string ToJson(object jsonObject)        {            StringBuilder sb = new StringBuilder();            sb.Append("{
    ");            PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();            for (int i = 0; i < propertyInfo.Length; i++)            {                object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);                Type type = propertyInfo[i].PropertyType;                string strValue = objectValue.ToString();                strValue = StringFormat(strValue, type);                sb.Append("\"" + propertyInfo[i].Name + "\":");                sb.Append(strValue + ",");            }            sb.Remove(sb.Length - 1, 1);            sb.Append("}");            return sb.ToString();        }        #endregion        #region list转json        /// 
        /// list转json        /// 
        public static string ListToJson
     
      (IList
      
        list)        {            object obj = list[0];            return ListToJson
       
        (list, obj.GetType().Name);        }        private static string ListToJson
        
         (IList
         
           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
          
           (); PropertyInfo[] pi = obj.GetType().GetProperties(); Json.Append("{ "); for (int j = 0; j < pi.Length; j++) { Type type = pi[j].GetValue(list[i], null).GetType(); Json.Append("\"" + pi[j].Name.ToString() + "\":" + StringFormat(pi[j].GetValue(list[i], null).ToString(), type)); if (j < pi.Length - 1) { Json.Append(","); } } Json.Append("}"); if (i < list.Count - 1) { Json.Append(","); } } } Json.Append("]}"); return Json.ToString(); } #endregion #region 对象集合转换为json /// 
           
 /// 对象集合转换为json /// 
 /// 
           对象集合 /// 
           
            json字符串
            public static string ToJson(IEnumerable array) { string jsonString = "["; foreach (object item in array) { jsonString += ToJson(item) + ","; } jsonString = jsonString.Substring(0, jsonString.Length - 1); return jsonString + "]"; } #endregion #region 普通集合转换Json /// 
           
 /// 普通集合转换Json /// 
 /// 
           集合对象 /// 
           
            Json字符串
            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 + "]"; } #endregion #region DataSet转换为Json /// 
           
 /// DataSet转换为Json /// 
 /// 
           DataSet对象 /// 
           
            Json字符串
            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 /// 
           
 /// Datatable转换为Json /// 
 public static string ToJson(DataTable dt) { if (dt.Rows.Count > 0) { 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(); } else return "[]"; } /// 
           
 /// DataTable转换为Json /// 
 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 #region DataReader转换为Json /// 
           
 /// DataReader转换为Json /// 
 /// 
           DataReader对象 /// 
           
            Json字符串
            public static string ToJson(DbDataReader dataReader) { 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("},"); } dataReader.Close(); jsonString.Remove(jsonString.Length - 1, 1); jsonString.Append("]"); return jsonString.ToString(); } #endregion #region 返回错误 public static string error() { DataTable dt = new DataTable(); dt.Columns.Add("error", typeof(int)); DataRow dr = dt.NewRow(); dr["error"] = 1; dt.Rows.Add(dr); return ToJson(dt); } #endregion }}