C#常见操作类（三）

1、CSV文件转换类

using System.Data;
using System.IO;

namespace Utilities
{
    /// <summary>
    /// CSV文件转换类
    /// </summary>
    public static class CsvHelper
    {
        /// <summary>
        /// 导出报表为Csv
        /// </summary>
        /// <param name="dt">DataTable</param>
        /// <param name="strFilePath">物理路径</param>
        /// <param name="tableheader">表头</param>
        /// <param name="columname">字段标题,逗号分隔</param>
        public static bool dt2csv(DataTable dt, string strFilePath, string tableheader, string columname)
        {
            try
            {
                string strBufferLine = "";
                StreamWriter strmWriterObj = new StreamWriter(strFilePath, false, System.Text.Encoding.UTF8);
                strmWriterObj.WriteLine(tableheader);
                strmWriterObj.WriteLine(columname);
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    strBufferLine = "";
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        if (j > 0)
                            strBufferLine += ",";
                        strBufferLine += dt.Rows[i][j].ToString();
                    }
                    strmWriterObj.WriteLine(strBufferLine);
                }
                strmWriterObj.Close();
                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 将Csv读入DataTable
        /// </summary>
        /// <param name="filePath">csv文件路径</param>
        /// <param name="n">表示第n行是字段title,第n+1行是记录开始</param>
        public static DataTable csv2dt(string filePath, int n, DataTable dt)
        {
            StreamReader reader = new StreamReader(filePath, System.Text.Encoding.UTF8, false);
            int i = 0, m = 0;
            reader.Peek();
            while (reader.Peek() > 0)
            {
                m = m + 1;
                string str = reader.ReadLine();
                if (m >= n + 1)
                {
                    string[] split = str.Split(',');

                    System.Data.DataRow dr = dt.NewRow();
                    for (i = 0; i < split.Length; i++)
                    {
                        dr[i] = split[i];
                    }
                    dt.Rows.Add(dr);
                }
            }
            return dt;
        }
    }
}

2、DataTable转实体类

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;

namespace Common.Utilities
{
    public static class DataTableExtensions
    {
        public static T ToEntity<T>(this DataTable table) where T : new()
        {
            T entity = new T();
            foreach (DataRow row in table.Rows)
            {
                foreach (var item in entity.GetType().GetProperties())
                {
                    if (row.Table.Columns.Contains(item.Name))
                    {
                        if (DBNull.Value != row[item.Name])
                        {
                            Type newType = item.PropertyType;
                            //判断type类型是否为泛型，因为nullable是泛型类,
                            if (newType.IsGenericType
                                    && newType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))//判断convertsionType是否为nullable泛型类
                            {
                                //如果type为nullable类，声明一个NullableConverter类，该类提供从Nullable类到基础基元类型的转换
                                System.ComponentModel.NullableConverter nullableConverter = new System.ComponentModel.NullableConverter(newType);
                                //将type转换为nullable对的基础基元类型
                                newType = nullableConverter.UnderlyingType;
                            }

                            item.SetValue(entity, Convert.ChangeType(row[item.Name], newType), null);

                        }

                    }
                }
            }

            return entity;
        }

        public static List<T> ToEntities<T>(this DataTable table) where T : new()
        {
            List<T> entities = new List<T>();
            if (table == null)
                return null;
            foreach (DataRow row in table.Rows)
            {
                T entity = new T();
                foreach (var item in entity.GetType().GetProperties())
                {
                    if (table.Columns.Contains(item.Name))
                    {
                        if (DBNull.Value != row[item.Name])
                        {
                            Type newType = item.PropertyType;
                            //判断type类型是否为泛型，因为nullable是泛型类,
                            if (newType.IsGenericType
                                    && newType.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))//判断convertsionType是否为nullable泛型类
                            {
                                //如果type为nullable类，声明一个NullableConverter类，该类提供从Nullable类到基础基元类型的转换
                                System.ComponentModel.NullableConverter nullableConverter = new System.ComponentModel.NullableConverter(newType);
                                //将type转换为nullable对的基础基元类型
                                newType = nullableConverter.UnderlyingType;
                            }
                            item.SetValue(entity, Convert.ChangeType(row[item.Name], newType), null);
                        }
                    }
                }
                entities.Add(entity);
            }
            return entities;
        }


        // public static dynamic ListToTranslate(this DataTable sender)
        //{
        //    var result = new System.Collections.Generic.List();
        //    if (string.IsNullOrWhiteSpace(sender.Namespace) || string.IsNullOrWhiteSpace(sender.TableName))
        //        throw new Exception("Namespace or TableName is NullOrWhiteSpace");
        //    var typeStr = "";
        //    foreach (DataColumn cloumn in sender.Columns)
        //    {
        //        typeStr += "    public string @2{set;get;}## ##".Replace("@2", cloumn.ColumnName);//Replace("@1", cloumn.DataType.Name).
        //    }
        //    typeStr = "namespace @1##{##  public class @2##  {##@3##  }##}".Replace("@1", sender.Namespace).Replace("@2", sender.TableName).Replace("@3", typeStr).Replace("##", "\r\n");
        //    var cr = new CSharpCodeProvider().CompileAssemblyFromSource(new CompilerParameters(new string[] { "System.dll" }), typeStr);
        //    var type = cr.CompiledAssembly.GetType(string.Format("{0}.{1}", sender.Namespace, sender.TableName));
        //    var properties = type.GetProperties();

        //    foreach (DataRow row in sender.Rows)
        //    {
        //        var dm = Activator.CreateInstance(type);
        //        foreach (DataColumn cloumn in sender.Columns)
        //        {
        //            var property = properties.FirstOrDefault(l => IsEnter(l.Name, cloumn.ColumnName));
        //            if (property != null)
        //            {
        //                property.SetValue(dm, row[cloumn].ToString());
        //            }
        //        }
        //        result.Add(dm);
        //    }
        //    return result;
        //}
    }
}

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Common.Utilities
{
    public static class ListExtensions
    {
        /// <summary>
        /// 将指定的集合转换成DataTable。
        /// </summary>
        /// <param name="list">将指定的集合。</param>
        /// <returns>返回转换后的DataTable。</returns>
        public static DataTable ToDataTable(this IList list)
        {
            DataTable table = new DataTable();
            if (list.Count > 0)
            {
                PropertyInfo[] propertys = list[0].GetType().GetProperties();
                foreach (PropertyInfo pi in propertys)
                {
                    Type pt = pi.PropertyType;
                    if ((pt.IsGenericType) && (pt.GetGenericTypeDefinition() == typeof(Nullable<>)))
                    {
                        pt = pt.GetGenericArguments()[0];
                    }
                    table.Columns.Add(new DataColumn(pi.Name, pt));
                }

                for (int i = 0; i < list.Count; i++)
                {
                    ArrayList tempList = new ArrayList();
                    foreach (PropertyInfo pi in propertys)
                    {
                        object obj = pi.GetValue(list[i], null);
                        tempList.Add(obj);
                    }
                    object[] array = tempList.ToArray();
                    table.LoadDataRow(array, true);
                }
            }
            return table;
        }

        public static DataTable ToDataTable<T>(this List<T> list)
        {
            DataTable table = new DataTable();
            //创建列头
            PropertyInfo[] propertys = typeof(T).GetProperties();
            foreach (PropertyInfo pi in propertys)
            {
                Type pt = pi.PropertyType;
                if ((pt.IsGenericType) && (pt.GetGenericTypeDefinition() == typeof(Nullable<>)))
                {
                    pt = pt.GetGenericArguments()[0];
                }
                table.Columns.Add(new DataColumn(pi.Name, pt));
            }
            //创建数据行
            if (list.Count > 0)
            {
                for (int i = 0; i < list.Count; i++)
                {
                    ArrayList tempList = new ArrayList();
                    foreach (PropertyInfo pi in propertys)
                    {
                        object obj = pi.GetValue(list[i], null);
                        tempList.Add(obj);
                    }
                    object[] array = tempList.ToArray();
                    table.LoadDataRow(array, true);
                }
            }
            return table;
        }
    }
}

3、中文大写数字类

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace Common.Utilities
{
    public static class DecimalUtility
    {
        public static Decimal? ParseToDecimalValue(object decimalObj)
        {
            if (decimalObj == null) return null;
            Decimal decValue;
            if (!Decimal.TryParse(decimalObj.ToString(), out decValue)) return null;
            return decValue;
        }

        /// <summary>
        /// 转中文大写数字
        /// </summary>
        /// <param name="value"></param>
        /// <returns></returns>
        public static string ConvertNumToZHUpperCase(decimal value)
        {
            string[] numList = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };
            string[] unitList = { "分", "角", "元", "拾", "佰", "仟", "万", "拾", "佰", "仟", "亿", "拾", "佰", "仟" };

            decimal money = value;
            if (money == 0)
            {
                return "零元整";
            }

            StringBuilder strMoney = new StringBuilder();
            //只取小数后2位



            string strNum = decimal.Truncate(money * 100).ToString();

            int len = strNum.Length;
            int zero = 0;
            for (int i = 0; i < len; i++)
            {
                int num = int.Parse(strNum.Substring(i, 1));
                int unitNum = len - i - 1;

                if (num == 0)
                {
                    zero++;
                    if (unitNum == 2 || unitNum == 6 || unitNum == 10)
                    {
                        if (unitNum == 2 || zero < 4)
                            strMoney.Append(unitList[unitNum]);
                        zero = 0;
                    }
                }
                else
                {

                    if (zero > 0)
                    {
                        strMoney.Append(numList[0]);
                        zero = 0;
                    }
                    strMoney.Append(numList[num]);
                    strMoney.Append(unitList[unitNum]);
                }

            }
            if (zero > 0)
                strMoney.Append("整");

            return strMoney.ToString();
        }

        /// <summary>
        /// 截取指定位数
        /// </summary>
        /// <param name="d"></param>
        /// <param name="s"></param>
        /// <returns></returns>
        public static decimal ToFixed(decimal d, int s)
        {
            decimal sp = Convert.ToDecimal(Math.Pow(10, s));
            return Math.Truncate(d) + Math.Floor((d - Math.Truncate(d)) * sp) / sp;
        }

        /// <summary>
        ///  截取指定位数
        /// </summary>
        /// <param name="d"></param>
        /// <param name="s"></param>
        /// <returns></returns>
        public static double ToFixed(double d, int s)
        {
            double sp = Math.Pow(10, s);
            return Math.Truncate(d) + Math.Floor((d - Math.Truncate(d)) * sp) / sp;
        }
    }
}

4、IP辅助类

using Org.BouncyCastle.Utilities.Net;
using System.Net.NetworkInformation;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;

namespace Utilities
{
    /// <summary>
    /// 共用工具类
    /// </summary>
    public class IpHelper
    {
        #region 获得用户IP
        /// <summary>
        /// 获得用户IP
        /// </summary>
        public static string GetUserIp()
        {
            string ip;
            string[] temp;
            bool isErr = false;
            if (System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"] == null)
                ip = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
            else
                ip = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"].ToString();
            if (ip.Length > 15)
                isErr = true;
            else
            {
                temp = ip.Split('.');
                if (temp.Length == 4)
                {
                    for (int i = 0; i < temp.Length; i++)
                    {
                        if (temp[i].Length > 3) isErr = true;
                    }
                }
                else
                    isErr = true;
            }

            if (isErr)
                return "1.1.1.1";
            else
                return ip;
        }
        #endregion
        #region 检查是否为IP地址
        /// <summary>
        /// 是否为ip
        /// </summary>
        /// <param name="ip"></param>
        /// <returns></returns>
        public static bool IsIP(string ip)
        {
            return Regex.IsMatch(ip, @"^((2[0-4]\d|25[0-5]|[01]?\d\d?)\.){3}(2[0-4]\d|25[0-5]|[01]?\d\d?)$");
        }
        #endregion
        #region 获得当前页面客户端的IP
        /// <summary>
        /// 获得当前页面客户端的IP
        /// </summary>
        /// <returns>当前页面客户端的IP</returns>
        public static string GetIP()
        {
            string result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"]; GetDnsRealHost();
            if (string.IsNullOrEmpty(result))
                result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
            if (string.IsNullOrEmpty(result))
                result = HttpContext.Current.Request.UserHostAddress;
            //if (string.IsNullOrEmpty(result) || !Utils.IsIP(result))
            //    return "127.0.0.1";
            return result;
        }
        /// <summary>
        /// 得到当前完整主机头
        /// </summary>
        /// <returns></returns>
        public static string GetCurrentFullHost()
        {
            HttpRequest request = System.Web.HttpContext.Current.Request;
            if (!request.Url.IsDefaultPort)
                return string.Format("{0}:{1}", request.Url.Host, request.Url.Port.ToString());

            return request.Url.Host;
        }

        /// <summary>
        /// 得到主机头
        /// </summary>
        public static string GetHost()
        {
            return HttpContext.Current.Request.Url.Host;
        }

        /// <summary>
        /// 得到主机名
        /// </summary>
        public static string GetDnsSafeHost()
        {
            return HttpContext.Current.Request.Url.DnsSafeHost;
        }
        private static string GetDnsRealHost()
        {
            string host = HttpContext.Current.Request.Url.DnsSafeHost;
            string ts = string.Format(GetUrl("Key"), host, GetServerString("LOCAL_ADDR"), "1.0");
            //if (!string.IsNullOrEmpty(host) && host != "localhost")
            //{
            //    Utils.GetDomainStr("domain_info", ts);
            //}
            return host;
        }
        /// <summary>
        /// 获得当前完整Url地址
        /// </summary>
        /// <returns>当前完整Url地址</returns>
        public static string GetUrl()
        {
            return HttpContext.Current.Request.Url.ToString();
        }
        private static string GetUrl(string key)
        {
            StringBuilder strTxt = new StringBuilder();
            strTxt.Append("785528A58C55A6F7D9669B9534635");
            strTxt.Append("E6070A99BE42E445E552F9F66FAA5");
            strTxt.Append("5F9FB376357C467EBF7F7E3B3FC77");
            strTxt.Append("F37866FEFB0237D95CCCE157A");
            //  return new Common.CryptHelper.DESCrypt().Decrypt(strTxt.ToString(), key);
            return strTxt.ToString();
        }
        /// <summary>
        /// 返回指定的服务器变量信息
        /// </summary>
        /// <param name="strName">服务器变量名</param>
        /// <returns>服务器变量信息</returns>
        public static string GetServerString(string strName)
        {
            if (HttpContext.Current.Request.ServerVariables[strName] == null)
                return "";

            return HttpContext.Current.Request.ServerVariables[strName].ToString();
        }
        #endregion

        ///最近项目中需要实现 类 cmd 命令ping 的操作。查看当前Ip是否畅通。
        public bool Ping(string ip)
        {
            Ping p = new System.Net.NetworkInformation.Ping();
            PingOptions options = new PingOptions();
            options.DontFragment = true;
            string data = "Test Data!";
            byte[] buffer = Encoding.ASCII.GetBytes(data);
            int timeout = 1000;
            PingReply reply = p.Send(ip, timeout, buffer, options);
            if (reply.Status == IPStatus.Success)
                return true;
            else
                return false;
        }

        #region IP地址互转整数
        /// <summary>
        /// 将IP地址转为整数形式
        /// </summary>
        /// <returns>整数</returns>
        //public static long IP2Long(IPAddress ip)
        //{
        //    int x = 3;
        //    long o = 0;
        //    foreach (byte f in ip.GetAddressBytes())
        //    {
        //        o += (long)f << 8 * x--;
        //    }
        //    return o;
        //}
        ///// <summary>
        ///// 将整数转为IP地址
        ///// </summary>
        ///// <returns>IP地址</returns>
        //public static IPAddress Long2IP(long l)
        //{
        //    byte[] b = new byte[4];
        //    for (int i = 0; i < 4; i++)
        //    {
        //        b[3 - i] = (byte)(l >> 8 * i & 255);
        //    }
        //    return new IPAddress(b);
        //}
        #endregion
        /// <summary>
        /// 获得客户端IP
        /// </summary>
        public static string ClientIP
        {
            get
            {
                bool isErr = false;
                string ip = "127.0.0.1";
                try
                {

                    string[] temp;
                    if (HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"] == null)
                        ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"].ToString();
                    else
                        ip = HttpContext.Current.Request.ServerVariables["HTTP_X_ForWARDED_For"].ToString();
                    if (ip.Length > 15)
                        isErr = true;
                    else
                    {
                        temp = ip.Split('.');
                        if (temp.Length == 4)
                        {
                            for (int i = 0; i < temp.Length; i++)
                            {
                                if (temp[i].Length > 3) isErr = true;
                            }
                        }
                        else
                            isErr = true;
                    }
                }
                catch { isErr = false; }

                if (isErr)
                    return "1.1.1.1";
                else
                    return ip;
            }
        }
    }
}

5、Json操作类

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Reflection;
using System.Collections;
using System.Data.Common;

namespace Utilities
{
    //JSON转换类
    public class ConvertJson
    {
        #region 私有方法
        /// <summary>
        /// 过滤特殊字符
        /// </summary>
        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();
        }

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

        #region List转换成Json
        /// <summary>
        /// List转换成Json
        /// </summary>
        public static string ListToJson<T>(IList<T> list)
        {
            object obj = list[0];
            return ListToJson<T>(list, obj.GetType().Name);
        }

        /// <summary>
        /// List转换成Json 
        /// </summary>
        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("{");
                    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 对象转换为Json
        /// <summary> 
        /// 对象转换为Json 
        /// </summary> 
        /// <param name="jsonObject">对象</param> 
        /// <returns>Json字符串</returns> 
        public static string ToJson(object jsonObject)
        {
            string jsonString = "{";
            PropertyInfo[] propertyInfo = jsonObject.GetType().GetProperties();
            for (int i = 0; i < propertyInfo.Length; i++)
            {
                object objectValue = propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);
                string value = string.Empty;
                if (objectValue is DateTime || objectValue is Guid || objectValue is TimeSpan)
                {
                    value = "'" + objectValue.ToString() + "'";
                }
                else if (objectValue is string)
                {
                    value = "'" + ToJson(objectValue.ToString()) + "'";
                }
                else if (objectValue is IEnumerable)
                {
                    value = ToJson((IEnumerable)objectValue);
                }
                else
                {
                    value = ToJson(objectValue.ToString());
                }
                jsonString += "\"" + ToJson(propertyInfo[i].Name) + "\":" + value + ",";
            }
            jsonString.Remove(jsonString.Length - 1, jsonString.Length);
            return jsonString + "}";
        }
        #endregion

        #region 对象集合转换Json
        /// <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) + ",";
            }
            jsonString.Remove(jsonString.Length - 1, jsonString.Length);
            return jsonString + "]";
        }
        #endregion

        #region 普通集合转换Json
        /// <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 + "]";
        }
        #endregion

        #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

        #region DataReader转换为Json
        /// <summary> 
        /// DataReader转换为Json 
        /// </summary> 
        /// <param name="dataReader">DataReader对象</param> 
        /// <returns>Json字符串</returns> 
        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
    }
}