将查询出来的数据集转化成JSON格式的类

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

namespace WikEasyUIDemo
{
    /// <summary>
    /// JSON帮助类
    /// </summary>
    public class JsonHelper
    {
        /// <summary>
        /// 生成表单编辑赋值 JSON格式
        /// </summary>
        /// <param name="dt"></param>
        /// <param name="displayCount"></param>
        /// <returns></returns>
        public static string CreateJsonOne(DataTable dt, bool displayCount)
        {
            StringBuilder JsonString = new StringBuilder();
            //Exception Handling       
            if (dt != null && dt.Rows.Count > 0)
            {

                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    JsonString.Append("{ ");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        if (j < dt.Columns.Count - 1)
                        {
                            JsonString.Append("ipt_" + dt.Columns[j].ColumnName.ToString().ToLower() + ":" + """ + dt.Rows[i][j].ToString() + "",");
                        }
                        else if (j == dt.Columns.Count - 1)
                        {
                            JsonString.Append("ipt_" + dt.Columns[j].ColumnName.ToString().ToLower() + ":" + """ + dt.Rows[i][j].ToString() + """);
                        }
                    }

                    if (i == dt.Rows.Count - 1)
                    {
                        JsonString.Append("} ");
                    }
                    else
                    {
                        JsonString.Append("}, ");
                    }
                }

                return JsonString.ToString();
            }
            else
            {
                return null;
            }

        }

       
        /// <summary>
        /// 将DataTable中的数据转换成JSON格式
        /// </summary>
        /// <param name="dt">数据源DataTable</param>
        /// <param name="displayCount">是否输出数据总条数</param>
        /// <returns></returns>
        public static string CreateJsonParameters(DataTable dt, bool displayCount)
        {
            return CreateJsonParameters(dt, displayCount, dt.Rows.Count);
        }
        /// <summary>
        /// 将DataTable中的数据转换成JSON格式
        /// </summary>
        /// <param name="dt">数据源DataTable</param>
        /// <returns></returns>
        public static string CreateJsonParameters(DataTable dt)
        {
            return CreateJsonParameters(dt, true);
        }
        /// <summary>
        /// 将DataTable中的数据转换成JSON格式
        /// </summary>
        /// <param name="dt">数据源DataTable</param>
        /// <param name="displayCount">是否输出数据总条数</param>
        /// <param name="totalcount">JSON中显示的数据总条数</param>
        /// <returns></returns>
        public static string CreateJsonParameters(DataTable dt, bool displayCount, int totalcount)
        {
            StringBuilder JsonString = new StringBuilder();
            //Exception Handling       

            if (dt != null)
            {
                JsonString.Append("{ ");
                JsonString.Append(""rows":[ ");
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    JsonString.Append("{ ");
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        if (j < dt.Columns.Count - 1)
                        {
                            //if (dt.Rows[i][j] == DBNull.Value) continue;
                            if (dt.Columns[j].DataType == typeof(bool))
                            {
                                JsonString.Append(""JSON_" + dt.Columns[j].ColumnName.ToLower() + "":" +
                                                  dt.Rows[i][j].ToString().ToLower() + ",");
                            }
                            else if (dt.Columns[j].DataType == typeof(string))
                            {
                                JsonString.Append(""JSON_" + dt.Columns[j].ColumnName.ToLower() + "":" + """ +
                                                  dt.Rows[i][j].ToString().Replace(""", "\"") + "",");
                            }
                            else
                            {
                                JsonString.Append(""JSON_" + dt.Columns[j].ColumnName.ToLower() + "":" + """ + dt.Rows[i][j] + "",");
                            }
                        }
                        else if (j == dt.Columns.Count - 1)
                        {
                            //if (dt.Rows[i][j] == DBNull.Value) continue;
                            if (dt.Columns[j].DataType == typeof(bool))
                            {
                                JsonString.Append(""JSON_" + dt.Columns[j].ColumnName.ToLower() + "":" +
                                                  dt.Rows[i][j].ToString().ToLower());
                            }
                            else if (dt.Columns[j].DataType == typeof(string))
                            {
                                JsonString.Append(""JSON_" + dt.Columns[j].ColumnName.ToLower() + "":" + """ +
                                                  dt.Rows[i][j].ToString().Replace(""", "\"") + """);
                            }
                            else
                            {
                                JsonString.Append(""JSON_" + dt.Columns[j].ColumnName.ToLower() + "":" + """ + dt.Rows[i][j] + """);
                            }
                        }
                    }
                    /*end Of String*/
                    if (i == dt.Rows.Count - 1)
                    {
                        JsonString.Append("} ");
                    }
                    else
                    {
                        JsonString.Append("}, ");
                    }
                }
                JsonString.Append("]");

                if (displayCount)
                {
                    JsonString.Append(",");

                    JsonString.Append(""total":");
                    JsonString.Append(totalcount);
                }

                JsonString.Append("}");
                return JsonString.ToString().Replace(" ", "");
            }
            else
            {
                return null;
            }
        }

        #region object 2 json

        private static void WriteDataRow(StringBuilder sb, DataRow row)
        {
            sb.Append("{");
            foreach (DataColumn column in row.Table.Columns)
            {
                sb.AppendFormat(""{0}":", column.ColumnName);
                WriteValue(sb, row[column]);
                sb.Append(",");
            }
            // Remove the trailing comma.
            if (row.Table.Columns.Count > 0)
            {
                --sb.Length;
            }
            sb.Append("}");
        }

        private static void WriteDataSet(StringBuilder sb, DataSet ds)
        {
            sb.Append("{"Tables":{");
            foreach (DataTable table in ds.Tables)
            {
                sb.AppendFormat(""{0}":", table.TableName);
                WriteDataTable(sb, table);
                sb.Append(",");
            }
            // Remove the trailing comma.
            if (ds.Tables.Count > 0)
            {
                --sb.Length;
            }
            sb.Append("}}");
        }

        private static void WriteDataTable(StringBuilder sb, DataTable table)
        {
            sb.Append("{"Rows":[");
            foreach (DataRow row in table.Rows)
            {
                WriteDataRow(sb, row);
                sb.Append(",");
            }
            // Remove the trailing comma.
            if (table.Rows.Count > 0)
            {
                --sb.Length;
            }
            sb.Append("]}");
        }

        private static void WriteEnumerable(StringBuilder sb, IEnumerable e)
        {
            bool hasItems = false;
            sb.Append("[");
            foreach (object val in e)
            {
                WriteValue(sb, val);
                sb.Append(",");
                hasItems = true;
            }
            // Remove the trailing comma.
            if (hasItems)
            {
                --sb.Length;
            }
            sb.Append("]");
        }

        private static void WriteHashtable(StringBuilder sb, IDictionary e)
        {
            bool hasItems = false;
            sb.Append("{");
            foreach (string key in e.Keys)
            {
                sb.AppendFormat(""{0}":", key.ToLower());
                WriteValue(sb, e[key]);
                sb.Append(",");
                hasItems = true;
            }
            // Remove the trailing comma.
            if (hasItems)
            {
                --sb.Length;
            }
            sb.Append("}");
        }

        private static void WriteObject(StringBuilder sb, object o)
        {
            MemberInfo[] members = o.GetType().GetMembers(BindingFlags.Instance | BindingFlags.Public);
            sb.Append("{");
            bool hasMembers = false;
            foreach (MemberInfo member in members)
            {
                bool hasValue = false;
                object val = null;
                if ((member.MemberType & MemberTypes.Field) == MemberTypes.Field)
                {
                    FieldInfo field = (FieldInfo)member;
                    val = field.GetValue(o);
                    hasValue = true;
                }
                else if ((member.MemberType & MemberTypes.Property) == MemberTypes.Property)
                {
                    PropertyInfo property = (PropertyInfo)member;
                    if (property.CanRead && property.GetIndexParameters().Length == 0)
                    {
                        val = property.GetValue(o, null);
                        hasValue = true;
                    }
                }
                if (hasValue)
                {
                    sb.Append(""");
                    sb.Append(member.Name);
                    sb.Append("":");
                    WriteValue(sb, val);
                    sb.Append(",");
                    hasMembers = true;
                }
            }
            if (hasMembers)
            {
                --sb.Length;
            }
            sb.Append("}");
        }

        private static void WriteString(StringBuilder sb, IEnumerable s)
        {
            sb.Append(""");
            foreach (char c in s)
            {
                switch (c)
                {
                    case '"':
                        sb.Append("\"");
                        break;
                    case '\':
                        sb.Append("\\");
                        break;
                    case '':
                        sb.Append("\b");
                        break;
                    case 'f':
                        sb.Append("\f");
                        break;
                    case ' ':
                        sb.Append("\n");
                        break;
                    case ' ':
                        sb.Append("\r");
                        break;
                    case ' ':
                        sb.Append("\t");
                        break;
                    default:
                        int i = c;
                        if (i < 32 || i > 127)
                        {
                            sb.AppendFormat("\u{0:X04}", i);
                        }
                        else
                        {
                            sb.Append(c);
                        }
                        break;
                }
            }
            sb.Append(""");
        }

        public static void WriteValue(StringBuilder sb, object val)
        {
            if (val == null || val == DBNull.Value)
            {
                sb.Append("null");
            }
            else if (val is string || val is Guid)
            {
                WriteString(sb, val.ToString());
            }
            else if (val is bool)
            {
                sb.Append(val.ToString().ToLower());
            }
            else if (val is double ||
                     val is float ||
                     val is long ||
                     val is int ||
                     val is short ||
                     val is byte ||
                     val is decimal)
            {
                sb.AppendFormat(CultureInfo.InvariantCulture.NumberFormat, "{0}", val);
            }
            else if (val.GetType().IsEnum)
            {
                sb.Append((int)val);
            }
            else if (val is DateTime)
            {
                sb.Append("new Date("");
                sb.Append(((DateTime)val).ToString("MMMM, d yyyy HH:mm:ss",
                                                    new CultureInfo("en-US", false).DateTimeFormat));
                sb.Append("")");
            }
            else if (val is DataSet)
            {
                WriteDataSet(sb, val as DataSet);
            }
            else if (val is DataTable)
            {
                WriteDataTable(sb, val as DataTable);
            }
            else if (val is DataRow)
            {
                WriteDataRow(sb, val as DataRow);
            }
            else if (val is Hashtable)
            {
                WriteHashtable(sb, val as Hashtable);
            }
            else if (val is IEnumerable)
            {
                WriteEnumerable(sb, val as IEnumerable);
            }
            else
            {
                WriteObject(sb, val);
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="o"></param>
        /// <returns></returns>
        public static string Convert2Json(object o)
        {
            StringBuilder sb = new StringBuilder();
            WriteValue(sb, o);
            return sb.ToString();
        }

        #endregion
    }

}

查询最终结果：

{ "rows":[ { "JSON_id":"2","JSON_cardnumber":"5353435","JSON_username":"xixi","JSON_sex":"","JSON_tel":"4535345","JSON_address":"","JSON_jifen":"50","JSON_time":"2013-7-16 8:50:37","JSON_showhouse":"","JSON_remark":""} ],"total":1}