JSON格式互转集合

　　在工作中我们经常会遇到格式转换的问题，有的时候是将JSON转换成DataTable、DataSet或是List等，也有可能将DataTable、DataSet或是List转换成JSON的，抽了点时间把这些方法整合了一下，希望对大家有所帮助，如果有什么问题请指出来，共同探讨。

代码：

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

 namespace BJYX.WEB.Public
 {
     public class Creat_Json
     {
         public Creat_Json()
         {
             //
             // TODO: 在此处添加构造函数逻辑
             //
         }

         public static string DataTable2Json(System.Data.DataTable dt)
         {
             System.Text.StringBuilder jsonBuilder = new System.Text.StringBuilder();
             jsonBuilder.Append("{");
             jsonBuilder.AppendFormat("\"total\":{0}, ", dt.Rows.Count);
             jsonBuilder.Append("\"rows\":[ ");
             for (int i = ; i < dt.Rows.Count; i++)
             {
                 jsonBuilder.Append("{");
                 for (int j = ; j < dt.Columns.Count; j++)
                 {
                     jsonBuilder.Append("\"");
                     jsonBuilder.Append(dt.Columns[j].ColumnName);
                     jsonBuilder.Append("\":\"");
                     jsonBuilder.Append(dt.Rows[i][j].ToString().Replace("\\", "\\\\").Replace("'", "&apos;").Replace("\t", " ").Replace("\r", " ").Replace("\n", "<br/>").Replace("\"", "&quot;"));
                     jsonBuilder.Append("\",");
                 }
                 jsonBuilder.Remove(jsonBuilder.Length - , );
                 jsonBuilder.Append("},");
             }
             jsonBuilder.Remove(jsonBuilder.Length - , );
             jsonBuilder.Append("]");
             jsonBuilder.Append("}");
             return jsonBuilder.ToString();
         }
         public static string DataTable2Json(System.Data.DataTable dt, int count)
         {
             System.Text.StringBuilder jsonBuilder = new System.Text.StringBuilder();
             jsonBuilder.Append("{");
             jsonBuilder.AppendFormat("\"total\":{0}, ", count);
             jsonBuilder.Append("\"rows\":[ ");
             for (int i = ; i < dt.Rows.Count; i++)
             {
                 jsonBuilder.Append("{");
                 for (int j = ; j < dt.Columns.Count; j++)
                 {
                     jsonBuilder.Append("\"");
                     jsonBuilder.Append(dt.Columns[j].ColumnName);
                     jsonBuilder.Append("\":\"");
                     jsonBuilder.Append(dt.Rows[i][j].ToString().Replace("\\", "\\\\").Replace("'", "&apos;").Replace("\t", " ").Replace("\r", " ").Replace("\n", "<br/>").Replace("\"", "&quot;"));
                     jsonBuilder.Append("\",");
                 }
                 jsonBuilder.Remove(jsonBuilder.Length - , );
                 jsonBuilder.Append("},");
             }
             jsonBuilder.Remove(jsonBuilder.Length - , );
             jsonBuilder.Append("]");
             jsonBuilder.Append("}");
             return jsonBuilder.ToString();
         }
         public static string DataTableToJson(System.Data.DataTable dt)
         {
             StringBuilder Json = new StringBuilder();
             Json.Append("[");
             if (dt.Rows.Count > )
             {
                 for (int i = ; i < dt.Rows.Count; i++)
                 {
                     Json.Append("{");
                     for (int j = ; j < dt.Columns.Count; j++)
                     {
                         Json.Append("\"" + dt.Columns[j].ColumnName.ToString() + "\":\"" + dt.Rows[i][j].ToString().Replace("\\", "\\\\").Replace("'", "&apos;").Replace("\t", " ").Replace("\r", " ").Replace("\n", "<br/>").Replace("\"", "&quot;") + "\"");
                         if (j < dt.Columns.Count - )
                         {
                             Json.Append(",");
                         }
                     }
                     Json.Append("}");
                     if (i < dt.Rows.Count - )
                     {
                         Json.Append(",");
                     }
                 }
             }
             Json.Append("]");
             return Json.ToString().Replace("\\", "\\\\").Replace("\'", "\\\'").Replace("\t", " ").Replace("\r", " ").Replace("\n", "<br/>");//.Replace("\"", "'"); ;
         }

         /// <summary>
         /// Table to JSON By FlexGrid
         /// </summary>
         /// <param name="ds"></param>
         /// <param name="page"></param>
         /// <returns></returns>
         public static string DataTableToJson(System.Data.DataTable dt, int page, int total)
         {
             StringBuilder jsonStr = new StringBuilder();
             jsonStr.Append("{");
             jsonStr.Append("\"page\":" + page + ",");
             jsonStr.Append("\"total\":" + total + ",");
             jsonStr.Append("\"rows\":");
             jsonStr.Append("[");

             foreach (System.Data.DataRow dr in dt.Rows)
             {
                 jsonStr.Append("{");

                 foreach (System.Data.DataColumn dc in dt.Columns)
                 {
                     jsonStr.Append("\"");
                     jsonStr.Append(dc.ColumnName);
                     jsonStr.Append("\"");
                     jsonStr.Append(":");

                     jsonStr.Append("\"");
                     jsonStr.Append(dr[dc].ToString().Trim());
                     jsonStr.Append("\" ,");
                 }

                 jsonStr.Remove(jsonStr.Length - , );
                 jsonStr.Append("}");
                 jsonStr.Append(",");
             }
             if (dt.Rows.Count > )
             {
                 jsonStr.Remove(jsonStr.Length - , );
             }
             jsonStr.Append("]");
             jsonStr.Append("}");

             return jsonStr.ToString();
         }

         /// <summary>
         /// List转成json
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="jsonName"></param>
         /// <param name="list"></param>
         /// <returns></returns>
         public static string ListToJson<T>(IList<T> list, string jsonName)
         {
             StringBuilder Json = new StringBuilder();
             if (string.IsNullOrEmpty(jsonName))
                 jsonName = list[].GetType().Name;
             Json.Append("{\"" + jsonName + "\":[");
             if (list.Count > )
             {
                 for (int i = ; i < list.Count; i++)
                 {
                     T obj = Activator.CreateInstance<T>();
                     PropertyInfo[] pi = obj.GetType().GetProperties();
                     Json.Append("{");
                     for (int j = ; 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 - )
                         {
                             Json.Append(",");
                         }
                     }
                     Json.Append("}");
                     if (i < list.Count - )
                     {
                         Json.Append(",");
                     }
                 }
             }
             Json.Append("]}");
             return Json.ToString();
         }

         /// <summary>
         /// List转成json
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="list"></param>
         /// <returns></returns>
         public static string ListToJson<T>(IList<T> list)
         {
             object obj = list[];
             return ListToJson<T>(list, obj.GetType().Name);
         }

         /// <summary>
         /// 对象转换为Json字符串
         /// </summary>
         /// <param name="jsonObject">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 = ; 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 - , jsonString.Length);
             return jsonString + "}";
         }

         /// <summary>
         /// 对象集合转换Json
         /// </summary>
         /// <param name="array">集合对象</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 - , jsonString.Length);
             return jsonString + "]";
         }

         /// <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 - , jsonString.Length);
             return jsonString + "]";
         }

         /// <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 = ; i < drc.Count; i++)
             {
                 jsonString.Append("{");
                 for (int j = ; 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 - )
                     {
                         jsonString.Append(strValue + ",");
                     }
                     else
                     {
                         jsonString.Append(strValue);
                     }
                 }
                 jsonString.Append("},");
             }
             jsonString.Remove(jsonString.Length - , );
             jsonString.Append("]");
             return jsonString.ToString();
         }

         /// <summary>
         /// DataTable转成Json
         /// </summary>
         /// <param name="jsonName"></param>
         /// <param name="dt"></param>
         /// <returns></returns>
         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 > )
             {
                 for (int i = ; i < dt.Rows.Count; i++)
                 {
                     Json.Append("{");
                     for (int j = ; 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 - )
                         {
                             Json.Append(",");
                         }
                     }
                     Json.Append("}");
                     if (i < dt.Rows.Count - )
                     {
                         Json.Append(",");
                     }
                 }
             }
             Json.Append("]}");
             return Json.ToString();
         }

         /// <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 = ; 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 - )
                     {
                         jsonString.Append(strValue + ",");
                     }
                     else
                     {
                         jsonString.Append(strValue);
                     }
                 }
                 jsonString.Append("},");
             }
             dataReader.Close();
             jsonString.Remove(jsonString.Length - , );
             jsonString.Append("]");
             return jsonString.ToString();
         }
         /// <summary>
         /// 将IList转成JSON
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="jsonName"></param>
         /// <param name="IL"></param>
         /// <returns></returns>
         public static string ObjectToJson<T>(IList<T> IL)
         {
             StringBuilder Json = new StringBuilder();
             Json.Append("[");
             if (IL.Count > )
             {
                 for (int i = ; i < IL.Count; i++)
                 {
                     T obj = Activator.CreateInstance<T>();
                     Type type = obj.GetType();
                     PropertyInfo[] pis = type.GetProperties();
                     Json.Append("{");
                     for (int j = ; j < pis.Length; j++)
                     {
                         Json.Append("\"" + pis[j].Name.ToString() + "\":\"" + pis[j].GetValue(IL[i], null) + "\"");
                         if (j < pis.Length - )
                         {
                             Json.Append(",");
                         }
                     }
                     Json.Append("}");
                     if (i < IL.Count - )
                     {
                         Json.Append(",");
                     }
                 }
             }
             Json.Append("]");
             return Json.ToString();
         }

         /// <summary>
         /// 将IList转成符合FlexiGrid控件格式的JSON
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="IL"></param>
         /// <param name="page">但前页</param>
         /// <param name="total">数据行数</param>
         /// <returns></returns>
         public static string ListToFlexiGridJson<T>(IList<T> IL, int page, int total)
         {
             StringBuilder Json = new StringBuilder();
             Json.Append("{");
             Json.Append("\"page\":" + page + ",");
             Json.Append("\"total\":" + total + ",");
             Json.Append("\"rows\":");
             Json.Append("[");

             if (IL.Count > )
             {
                 for (int i = ; i < IL.Count; i++)
                 {
                     T obj = Activator.CreateInstance<T>();
                     Type type = obj.GetType();
                     PropertyInfo[] pis = type.GetProperties();
                     Json.Append("{");
                     for (int j = ; j < pis.Length; j++)
                     {
                         Json.Append("\"" + pis[j].Name.ToString() + "\":\"" + pis[j].GetValue(IL[i], null) + "\"");
                         if (j < pis.Length - )
                         {
                             Json.Append(",");
                         }
                     }
                     Json.Append("}");
                     if (i < IL.Count - )
                     {
                         Json.Append(",");
                     }
                 }
             }
             Json.Append("]");
             Json.Append("}");
             return Json.ToString();
         }

         /// <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 + "}";
         }

         /// <summary>
         /// 过滤特殊字符
         /// </summary>
         /// <param name="s"></param>
         /// <returns></returns>
         private static string String2Json(String s)
         {
             StringBuilder sb = new StringBuilder();
             for (int i = ; 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();
             }
             return str;
         }

     }
 }