HGSRM/ICSSoft.WMS.WebAPI/ICSSoft.Common/DataToJsonHelper.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Globalization;

namespace ICSSoft.Common
{
    public class DataToJsonHelper
    {

  /*      string sql = @"SELECT Identification,y.DepCode,a.ToWarehouseCode AS WarehouseCode
                                    FROM ICSWareHouseLotInfoLog a
                                    INNER JOIN ICSInventoryLotDetail b ON a.LotNo=b.LotNo AND a.WorkPoint=b.WorkPoint
                                    INNER JOIN ICSOApplyNegDetail c ON b.TransCode=c.OApplyNegCode AND b.TransSequence=c.Sequence AND b.WorkPoint=c.WorkPoint
                                    INNER JOIN ICSOOPick x ON c.SourceDetailID=x.PickID AND c.WorkPoint=x.WorkPoint
                                    INNER JOIN ICSOutsourcingOrder y ON x.OODetailID=y.OODetailID AND x.WorkPoint=y.WorkPoint
                                    GROUP BY Identification,y.DepCode,a.ToWarehouseCode

                        SELECT Identification,y.OOCode,
                                    a.InvCode,SUM(a.Quantity) AS Quantity,0 AS Amount,c.SourceDetailID
                                    FROM ICSWareHouseLotInfoLog a
                                    INNER JOIN ICSInventoryLotDetail b ON a.LotNo=b.LotNo AND a.WorkPoint=b.WorkPoint
                                    INNER JOIN ICSOApplyNegDetail c ON b.TransCode=c.OApplyNegCode AND b.TransSequence=c.Sequence AND b.WorkPoint=c.WorkPoint
                                    INNER JOIN ICSOOPick x ON c.SourceDetailID=x.PickID AND c.WorkPoint=x.WorkPoint
                                    INNER JOIN ICSOutsourcingOrder y ON x.OODetailID=y.OODetailID AND x.WorkPoint=y.WorkPoint
                                    GROUP BY Identification,y.OOCode,a.MUSER,a.InvCode,c.SourceDetailID";

        DataSet ds = DBHelper.SQlReturnDataSet(sql, cmd, language);
        string RelationName = "details";
        DataRelation dr = new DataRelation(RelationName, ds.Tables[0].Columns["Identification"], ds.Tables[1].Columns["Identification"]);
        ds.Relations.Add(dr);
                    string aaa = DataToJson.DataSetToJson(ds, RelationName);
*/
        /// <summary>
        /// DataSet转Json字符串，主子结构
        /// 需要建立主子表关系，第一张表为主表
        /// 会排除关联列
        /// </summary>
        /// <param name="dataSet"></param>
        /// <param name="RelationName">关系名称</param>
        /// <returns></returns>
        public static string DataSetToJson(DataSet dataSet,string RelationName,string column)
        {
            //if (!dataSet.Tables[0].Columns.Contains(column))
            //{

            //}
            DataRelation dataRelation = new DataRelation(RelationName, dataSet.Tables[0].Columns[column], dataSet.Tables[1].Columns[column]);
            dataSet.Relations.Add(dataRelation);

            StringBuilder jsonString = new StringBuilder();
            //foreach (DataTable table in dataSet.Tables)
            //{
            DataTable table = dataSet.Tables[0];

            jsonString.Append("[");
            DataRowCollection drc = table.Rows;
            for (int i = 0; i < drc.Count; i++)
            {
                DataRow dataRow = drc[i];
                jsonString.Append("{");
                for (int j = 0; j < table.Columns.Count; j++)
                {
                    string strKey = table.Columns[j].ColumnName;
                    if (dataSet.Relations[RelationName].ParentColumns.Select(a=>a.Caption).Contains(strKey))
                        continue;
                    string strValue = dataRow[j].ToString();
                    Type type = table.Columns[j].DataType;
                    jsonString.Append("\"" + strKey + "\":");
                    strValue = StringFormat(strValue, type);
                    if (j < table.Columns.Count - 1)
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }
                jsonString.Append(",\"" + RelationName + "\":");
                DataRow[] drs = dataRow.GetChildRows(RelationName);
                jsonString.Append("[");
                foreach (DataRow dr in drs)
                {
                    DataTable dt = dr.Table;
                    jsonString.Append("{");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        string strKey = dt.Columns[j].ColumnName;
                        if (dataSet.Relations[RelationName].ChildColumns.Select(a => a.Caption).Contains(strKey))
                            continue;
                        string strValue = dr[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("},");
                }
                if(drs.Length>0)
                    jsonString.Remove(jsonString.Length - 1, 1);
                jsonString.Append("]");

                jsonString.Append("},");
            }
            jsonString.Remove(jsonString.Length - 1, 1);
            jsonString.Append("]");
            //}
            string res = jsonString.ToString();
            return res;
        }


        public static string DataSetToJson2(DataSet dataSet, string RelationName, string column)
        {
            //if (!dataSet.Tables[0].Columns.Contains(column))
            //{

            //}
            DataRelation dataRelation = new DataRelation(RelationName, dataSet.Tables[0].Columns[column], dataSet.Tables[1].Columns[column]);
            dataSet.Relations.Add(dataRelation);

            StringBuilder jsonString = new StringBuilder();
            //foreach (DataTable table in dataSet.Tables)
            //{
            DataTable table = dataSet.Tables[0];

            jsonString.Append("[");
            DataRowCollection drc = table.Rows;
            for (int i = 0; i < drc.Count; i++)
            {
                DataRow dataRow = drc[i];
                jsonString.Append("{");
                for (int j = 0; j < table.Columns.Count; j++)
                {
                    string strKey = table.Columns[j].ColumnName;
                    if (dataSet.Relations[RelationName].ParentColumns.Select(a => a.Caption).Contains(strKey))
                        continue;
                    string strValue = dataRow[j].ToString();
                    Type type = table.Columns[j].DataType;
                    jsonString.Append("\"" + strKey + "\":");
                    strValue = StringFormat(strValue, type);
                    if (j < table.Columns.Count - 1)
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }
                jsonString.Append(",\"" + RelationName + "\":");
                DataRow[] drs = dataRow.GetChildRows(RelationName);
                jsonString.Append("[");
                foreach (DataRow dr in drs)
                {
                    DataTable dt = dr.Table;
                    jsonString.Append("{");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        string strKey = dt.Columns[j].ColumnName;
                        if (dataSet.Relations[RelationName].ChildColumns.Select(a => a.Caption).Contains(strKey))
                            continue;
                        string strValue = dr[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("},");
                }
                if (drs.Length > 0)
                    jsonString.Remove(jsonString.Length - 1, 1);
                jsonString.Append("]");

                jsonString.Append("},");
            }
            jsonString.Remove(jsonString.Length - 1, 1);
            jsonString.Append("]");
            //}
            string res = jsonString.ToString();
            return res;
        }
        

        /// <summary>
        /// DataSet转Json字符串，"主-子-子"结构
        /// 需要建立主子表关系，第一张表为主表,第二张表为子表，第三张表为子件表
        /// 会排除关联列
        /// </summary>
        /// <param name="dataSet"></param>
        /// <param name="RelationName">关系名称</param>
        /// <returns></returns>
        public static string DataSetToJson(DataSet dataSet,string RelationName,string column,string RelationName2,string column2)
        {
            //if (!dataSet.Tables[0].Columns.Contains(column))
            //{

            //}
            DataRelation dataRelation = new DataRelation(RelationName, dataSet.Tables[0].Columns[column], dataSet.Tables[1].Columns[column]);
            DataRelation dataRelation2 = new DataRelation(RelationName2, dataSet.Tables[1].Columns[column2], dataSet.Tables[2].Columns[column2]);
            dataSet.Relations.Add(dataRelation);
            dataSet.Relations.Add(dataRelation2);

            StringBuilder jsonString = new StringBuilder();
            //foreach (DataTable table in dataSet.Tables)
            //{
            DataTable table = dataSet.Tables[0];
            DataTable table2 = dataSet.Tables[1];

            jsonString.Append("[");
            DataRowCollection drc = table.Rows;
            for (int i = 0; i < drc.Count; i++)
            {
                DataRow dataRow = drc[i];
                jsonString.Append("{");
                for (int j = 0; j < table.Columns.Count; j++)
                {
                    string strKey = table.Columns[j].ColumnName;
                    if (dataSet.Relations[RelationName].ParentColumns.Select(a=>a.Caption).Contains(strKey))
                        continue;
                    string strValue = dataRow[j].ToString();
                    Type type = table.Columns[j].DataType;
                    jsonString.Append("\"" + strKey + "\":");
                    strValue = StringFormat(strValue, type);
                    if (j < table.Columns.Count - 1)
                    {
                        jsonString.Append(strValue + ",");
                    }
                    else
                    {
                        jsonString.Append(strValue);
                    }
                }
                jsonString.Append(",\"" + RelationName + "\":");
                DataRow[] drs = dataRow.GetChildRows(RelationName);
                jsonString.Append("[");
                foreach (DataRow dr in drs)
                {
                    DataTable dt = dr.Table;
                    jsonString.Append("{");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        string strKey = dt.Columns[j].ColumnName;
                        if (dataSet.Relations[RelationName].ChildColumns.Select(a => a.Caption).Contains(strKey))
                            continue;
                        string strValue = dr[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);
                        }
                    }

                    ////子件表
                    jsonString.Append(",\"" + RelationName2 + "\":");
                    //DataRowCollection drc2 = table2.Rows;
                    //for (int j = 0; j < drc2.Count; j++)
                    //{
                    //    DataRow dataRow2 = drc2[j];
                    DataRow[] drss = dr.GetChildRows(RelationName2);//取不到值
                        jsonString.Append("[");
                        foreach (DataRow drSec in drss)
                        {
                            DataTable dtSec = drSec.Table;
                            jsonString.Append("{");
                            for (int k = 0; k < dtSec.Columns.Count; k++)
                            {
                                string strKey = dtSec.Columns[k].ColumnName;
                                if (dataSet.Relations[RelationName2].ChildColumns.Select(a => a.Caption).Contains(strKey))
                                    continue;
                                string strValue = drSec[k].ToString();
                                Type type = dtSec.Columns[k].DataType;
                                jsonString.Append("\"" + strKey + "\":");
                                strValue = StringFormat(strValue, type);
                                if (k < dtSec.Columns.Count - 1)
                                {
                                    jsonString.Append(strValue + ",");
                                }
                                else
                                {
                                    jsonString.Append(strValue);
                                }
                            }
                            jsonString.Append("},");
                        }
                    if (drss.Length > 0)
                        jsonString.Remove(jsonString.Length - 1, 1);
                    jsonString.Append("]");//detailss的后方括号

                    jsonString.Append("},");
                }
                if (drs.Length>0)
                        jsonString.Remove(jsonString.Length - 1, 1);
                    jsonString.Append("]");

                jsonString.Append("},");
            }
            jsonString.Remove(jsonString.Length - 1, 1);
            jsonString.Append("]");
            //}
            string res = jsonString.ToString();
            return res;
        }

        public static string DataSetToJsonImprove(DataSet dataSet, string RelationName, string column, string RelationName2, string column2)
        {
            // 验证参数
            if (dataSet == null || dataSet.Tables.Count < 3)
                return "[]";

            // 移除已存在的关系（避免重复添加）
            if (dataSet.Relations.Contains(RelationName))
                dataSet.Relations.Remove(RelationName);
            if (dataSet.Relations.Contains(RelationName2))
                dataSet.Relations.Remove(RelationName2);

            try
            {
                DataRelation dataRelation = new DataRelation(
                    RelationName,
                    dataSet.Tables[0].Columns[column],
                    dataSet.Tables[1].Columns[column]);

                DataRelation dataRelation2 = new DataRelation(
                    RelationName2,
                    dataSet.Tables[1].Columns[column2],
                    dataSet.Tables[2].Columns[column2]);

                dataSet.Relations.Add(dataRelation);
                dataSet.Relations.Add(dataRelation2);
            }
            catch (Exception ex)
            {
                throw new ArgumentException("创建数据关系失败", ex);
            }

            StringBuilder jsonString = new StringBuilder();
            jsonString.Append("[");

            DataTable table = dataSet.Tables[0];
            bool isFirstMain = true;

            foreach (DataRow dataRow in table.Rows)
            {
                if (!isFirstMain)
                    jsonString.Append(",");
                else
                    isFirstMain = false;

                jsonString.Append("{");

                // 主表字段
                bool isFirstColumn = true;
                for (int j = 0; j < table.Columns.Count; j++)
                {
                    string columnName = table.Columns[j].ColumnName;

                    // 跳过关联字段
                    if (dataSet.Relations[RelationName].ParentColumns.Any(c => c.ColumnName == columnName))
                        continue;

                    if (!isFirstColumn)
                        jsonString.Append(",");
                    else
                        isFirstColumn = false;

                    jsonString.Append($"\"{columnName}\":");
                    AppendFormattedValue(jsonString, dataRow[j], table.Columns[j].DataType);
                }

                // 第一层子表
                jsonString.Append($",\"{RelationName}\":[");

                DataRow[] childRows = dataRow.GetChildRows(RelationName);
                bool isFirstChild = true;

                foreach (DataRow childRow in childRows)
                {
                    if (!isFirstChild)
                        jsonString.Append(",");
                    else
                        isFirstChild = false;

                    jsonString.Append("{");

                    // 子表字段
                    bool isFirstChildColumn = true;
                    DataTable childTable = childRow.Table;

                    for (int j = 0; j < childTable.Columns.Count; j++)
                    {
                        string columnName = childTable.Columns[j].ColumnName;

                        // 跳过关联字段
                        if (dataSet.Relations[RelationName].ChildColumns.Any(c => c.ColumnName == columnName))
                            continue;

                        if (!isFirstChildColumn)
                            jsonString.Append(",");
                        else
                            isFirstChildColumn = false;

                        jsonString.Append($"\"{columnName}\":");
                        AppendFormattedValue(jsonString, childRow[j], childTable.Columns[j].DataType);
                    }

                    // 第二层子表（孙表）
                    jsonString.Append($",\"{RelationName2}\":[");

                    DataRow[] grandChildRows = childRow.GetChildRows(RelationName2);
                    bool isFirstGrandChild = true;

                    foreach (DataRow grandChildRow in grandChildRows)
                    {
                        if (!isFirstGrandChild)
                            jsonString.Append(",");
                        else
                            isFirstGrandChild = false;

                        jsonString.Append("{");

                        // 孙表字段
                        bool isFirstGrandChildColumn = true;
                        DataTable grandChildTable = grandChildRow.Table;

                        for (int k = 0; k < grandChildTable.Columns.Count; k++)
                        {
                            string columnName = grandChildTable.Columns[k].ColumnName;

                            // 跳过关联字段
                            if (dataSet.Relations[RelationName2].ChildColumns.Any(c => c.ColumnName == columnName))
                                continue;

                            if (!isFirstGrandChildColumn)
                                jsonString.Append(",");
                            else
                                isFirstGrandChildColumn = false;

                            jsonString.Append($"\"{columnName}\":");
                            AppendFormattedValue(jsonString, grandChildRow[k], grandChildTable.Columns[k].DataType);
                        }

                        jsonString.Append("}");
                    }

                    jsonString.Append("]"); // 结束孙表数组
                    jsonString.Append("}"); // 结束子表对象
                }

                jsonString.Append("]"); // 结束子表数组
                jsonString.Append("}"); // 结束主表对象
            }

            jsonString.Append("]");
            return jsonString.ToString();
        }

        private static void AppendFormattedValue(StringBuilder sb, object value, Type dataType)
        {
            if (value == DBNull.Value || value == null)
            {
                sb.Append("null");
                return;
            }

            if (dataType == typeof(string))
            {
                string str = value.ToString();
                // 转义特殊字符
                str = str.Replace("\\", "\\\\")
                         .Replace("\"", "\\\"")
                         .Replace("\n", "\\n")
                         .Replace("\r", "\\r")
                         .Replace("\t", "\\t");
                sb.Append($"\"{str}\"");
            }
            else if (dataType == typeof(DateTime))
            {
                DateTime dt = (DateTime)value;
                sb.Append($"\"{dt:yyyy-MM-ddTHH:mm:ss}\"");
            }
            else if (dataType == typeof(bool))
            {
                sb.Append(value.ToString().ToLower());
            }
            else if (IsNumericType(dataType))
            {
                sb.Append(Convert.ToString(value, CultureInfo.InvariantCulture));
            }
            else
            {
                sb.Append($"\"{value}\"");
            }
        }

        private static bool IsNumericType(Type type)
        {
            return type == typeof(int) || type == typeof(long) || type == typeof(double)
                || type == typeof(float) || type == typeof(decimal) || type == typeof(short)
                || type == typeof(byte) || type == typeof(sbyte) || type == typeof(ushort)
                || type == typeof(uint) || type == typeof(ulong);
        }

        #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();
        }
        /// <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;
        }
        #endregion

        #region list转换成JSON
        /// <summary>
        /// list转换为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>
        /// list转换为json
        /// </summary>
        /// <typeparam name="T1"></typeparam>
        /// <param name="list"></param>
        /// <param name="p"></param>
        /// <returns></returns>
        private 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">json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 对象集合转换为json
        /// <summary>
        /// 对象集合转换为json
        /// </summary>
        /// <param name="array">对象集合</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
    }
}