json

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using System.Text.RegularExpressions;

namespace Tlw.zjxypj.Common
{
    public class DataTableConvertJson
    {

        #region ------DataTable转换成Json格式(方法转)------
        /// <summary>  
        /// dataTable转换成Json格式  
        /// </summary>  
        /// <param name="dt"></param>  
        /// <returns></returns>  
        public static string DataTableToJson(DataTable dt)
        {
            StringBuilder jsonBuilder = new StringBuilder();
            jsonBuilder.Append("{\"");
            jsonBuilder.Append(dt.TableName);
            jsonBuilder.Append("\":[");
            jsonBuilder.Append("[");
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                jsonBuilder.Append("{");
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    jsonBuilder.Append("\"");
                    jsonBuilder.Append(dt.Columns[j].ColumnName);
                    jsonBuilder.Append("\":\"");
                    jsonBuilder.Append(dt.Rows[i][j].ToString());
                    jsonBuilder.Append("\",");
                }
                jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
                jsonBuilder.Append("},");
            }
            jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
            jsonBuilder.Append("]");
            jsonBuilder.Append("}");
            return jsonBuilder.ToString();
        }

        #endregion ------DataTable转换成Json格式------

        #region ------DataTable转换成Json格式(插件转)------
        /// <summary>
        /// DataTable转换成Json格式(插件转)
        /// </summary>
        /// <param name="_dt"></param>
        /// <returns></returns>
        public static string GetJsonByDataTable(DataTable _dt)
        {
            string result = "";
            result = JsonConvert.SerializeObject(_dt, new DataTableConverter());
            return result;
        }
        #endregion ------DataTable转换成Json格式------

        #region ------DataSet转换成Json格式(方法转)------
        /// <summary>  
        /// DataSet转换成Json格式(方法转)
        /// </summary>  
        /// <param name="ds">DataSet</param> 
        /// <returns></returns>  
        public static string DatasetToJson(DataSet ds)
        {
            StringBuilder json = new StringBuilder();

            foreach (DataTable dt in ds.Tables)
            {
                json.Append("{\"");
                json.Append(dt.TableName);
                json.Append("\":");
                json.Append(DataTableToJson(dt));
                json.Append("}");
            } return json.ToString();
        }
        #endregion ------DataSet转换成Json格式------

        /// <summary>
        /// Msdn
        /// </summary>
        /// <param name="jsonName"></param>
        /// <param name="dt"></param>
        /// <returns></returns>
        public static string DataTableToJson(string jsonName, DataTable dt)
        {
            StringBuilder Json = new StringBuilder();
            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++)
                    {
                        Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString() + "\"");
                        if (j < dt.Columns.Count - 1)
                        {
                            Json.Append(",");
                        }
                    }
                    Json.Append("}");
                    if (i < dt.Rows.Count - 1)
                    {
                        Json.Append(",");
                    }
                }
            }
            Json.Append("]}");
            return Json.ToString();
        }

        #region ------Jason转换成Datatable------
        /// <summary>
        /// 将json转换为DataTable
        /// </summary>
        /// <param name="strJson">得到的json</param>
        /// <returns></returns>
        public static DataTable JsonToDataTable(string strJson)
        {
            List<Dictionary<string, string>> ListRoot = JSonUtil.Deserialize<List<Dictionary<string, string>>>(strJson);
            DataTable dt = new DataTable();
            #region --解析Jason结果--
            foreach (Dictionary<string, string> item in ListRoot)
            {
                DataRow dr = dt.NewRow();
                foreach (KeyValuePair<string, string> it in item)
                {
                    if (!dt.Columns.Contains(it.Key))
                    {
                        var dc = new DataColumn();
                        dc.ColumnName = it.Key;
                        dt.Columns.Add(dc);
                    }
                    dr[it.Key] = it.Value;
                }
                dt.Rows.Add(dr);
            }
            #endregion ----
            return dt;
        }
        #endregion ------------
    }
}