using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.Script.Serialization;

namespace NGTools.Tools
{
  public class JSONConvert
  {

     public static DataTable JsonToDatatable(string json)
     {
      DataTable dataTable = new DataTable(); //实例化
      DataTable result;
      try
      {

        JavaScriptSerializer javaScriptSerializer = new JavaScriptSerializer();  //引用System.Web.Extensions
        javaScriptSerializer.MaxJsonLength = Int32.MaxValue; //取得最大数值
        ArrayList arrayList = javaScriptSerializer.Deserialize<ArrayList>(json);
        if (arrayList.Count > 0)
        {
          foreach (Dictionary<string, object> dictionary in arrayList)
          {
            if (dictionary.Keys.Count<string>() == 0)
            {
              result = dataTable;
              // return result;
            }
            if (dataTable.Columns.Count == 0)
            {
              foreach (string current in dictionary.Keys)
              {
                dataTable.Columns.Add(current, dictionary[current].GetType());
              }
            }
            DataRow dataRow = dataTable.NewRow();
            foreach (string current in dictionary.Keys)
            {
              dataRow[current] = dictionary[current];
            }

            dataTable.Rows.Add(dataRow); //循环添加行到DataTable中
          }
        }
      }
      catch
      {
      }
      return dataTable;
      // return result;
    }

    #region datatable转换json /ToJsonList(DataTable dt)
    /// <summary>
    /// datatable转换json
    /// </summary>
    /// <param name="dt"></param>
    /// <returns></returns>
    public static string DataTableToJsonList(DataTable dt)
    {
      //StringBuilder jsonString = new StringBuilder();
      //jsonString.Append("[");
      //DataRowCollection drc = dt.Rows;
      //for (int i = 0; i < drc.Count; i++)
      //{
      //  jsonString.Append("{");
      //  jsonString.Append("\"ID\":");
      //  jsonString.Append(dt.Rows[i]["ID"] + ",");
      //  jsonString.Append("\"jldPar\":\"{");

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

      //string str = jsonString.ToString();
      var JsonString = new StringBuilder();
      if (dt.Rows.Count > 0)
      {
        JsonString.Append("");
        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("\"" + dt.Columns[j].ColumnName.ToString()
            + "\":" + "\"" + dt.Rows[i][j].ToString() + "\",");
            }
            else if (j == dt.Columns.Count - 1)
            {
              JsonString.Append("\"" + dt.Columns[j].ColumnName.ToString()
             + "\":" + "\"" + dt.Rows[i][j].ToString() + "\"");
            }
          }
          if (i == dt.Rows.Count - 1)
          {
            JsonString.Append("}");
          }
          else
          {
            JsonString.Append("},");
          }
        }
        JsonString.Append("");
      }
      return JsonString.ToString(); 

    }
    #endregion

    #region 格式化字符型、日期型、布尔型 /StringFormat(string str, Type type)
    /// <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 + "\\\"";
        if (string.IsNullOrEmpty(str.Trim()))
        {
          str = "\\\"" + str + "\\\"";
        }
        else
        {
          str = "\\\"" + DateTime.Parse(str.Trim()).ToString("yyyy-MM-dd HH:mm:ss") + "\\\"";
        }
      }
      else if (type == typeof(bool))
      {
        str = str.ToLower();
      }
      else if (type != typeof(string) && string.IsNullOrEmpty(str))
      {
        str = "\\\"" + str + "\\\"";
      }
      return str;
    }

    #endregion

    #region 过滤特殊字符 /String2Json(String s)
    /// <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();
    } 
    #endregion

   #region "datatabale 转换成dg"
    /// <summary>
    /// 把DataTable数据转换为Json格式
    /// </summary>
    /// <param name="dt">传入DataTable数据</param>
    /// <returns></returns>
    public static string DataTableToDataGridJson(DataTable dt, bool multRow)
    {
      StringBuilder jsonBuilder = new StringBuilder();
      jsonBuilder.Append("{\"total\"");
      jsonBuilder.Append(":");
      jsonBuilder.Append(dt.Rows.Count);
      jsonBuilder.Append(",\"rows\":");
      if (dt .Rows.Count!=1|| multRow ) 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("\":\"");
          if (dt.Columns[j].ColumnName == "RQ")
          {
            jsonBuilder.Append(dt.Rows[i][j].ToString().Split(' ')[0]);
          }
          else
          {
            jsonBuilder.Append(dt.Rows[i][j].ToString());
          }
          jsonBuilder.Append("\",");
        }
        jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
        jsonBuilder.Append("},");
      }
      if (dt.Rows.Count > 0)
      {
        jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
      }
      if (dt.Rows.Count != 1 || multRow)
      { jsonBuilder.Append("],"); }
      else { jsonBuilder.Append(","); };
      jsonBuilder.Append("\"title");
      //jsonBuilder.Append(dt.TableName);
      jsonBuilder.Append("\":[");
      
      //jsonBuilder.Append("{\"title\": \"\", \"field\":\"ck\",\"checkbox\":\"true\",\"sortable\":\"false\"},");
      for (int n = 0; n < dt.Columns.Count; n++) //这是循环获取列名称
      {
        jsonBuilder.Append("{");
        jsonBuilder.Append("\"field");
        jsonBuilder.Append("\":\"");
        jsonBuilder.Append(dt.Columns[n].ColumnName);
        jsonBuilder.Append("\",");
        jsonBuilder.Append("\"title");
        jsonBuilder.Append("\":\"");
        jsonBuilder.Append(dt.Columns[n].ColumnName);
        jsonBuilder.Append("\",\"sortable\":\"true\"");
        jsonBuilder.Append("},");
      }
      jsonBuilder.Remove(jsonBuilder.Length - 1, 1);
      jsonBuilder.Append("},");

      jsonBuilder.Remove(jsonBuilder.Length - 2, 2);
      jsonBuilder.Append("]");
      jsonBuilder.Append("}");
      return jsonBuilder.ToString();
    }

        #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 + "\":");
                
                    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() + "\":" + "\"" + 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();
        }
        #endregion


    }
}