数据表转换成json(DatatableToJson)

   #region 转换Table为JSON数据
         /// <summary>
         /// 转换Table为JSON数据
         /// </summary>
         /// <param name="dt"></param>
         /// <returns></returns>
         public static string TableToJson(DataTable dt)
         {
             StringBuilder sb = new StringBuilder("[");
             foreach (DataRow row in dt.Rows)
             {
                 if (!row.Equals(dt.Rows[])) sb.Append(",");
                 sb.Append("{");
                 foreach (DataColumn col in dt.Columns)
                 {
                     if (!col.Equals(dt.Columns[])) sb.Append(",");
                     string value = GetText(row, col.ColumnName);
                     if (string.IsNullOrEmpty(value)) continue;          //跳过为空的数据
                     sb.Append("\"").Append(col.ColumnName).Append("\":\"").Append(value).Append("\"");
                 }
                 sb.Append("}");
             }
             sb.Append("]");
             return sb.ToString();
         }
         /// <summary>
         /// 从datable中读取文本
         /// </summary>
         /// <param name="row"></param>
         /// <param name="col"></param>
         /// <returns></returns>
         private static string GetText(DataRow row, string col)
         {
             return row.IsNull(col) ? string.Empty : row[col].ToString();
         }
         #endregion