public class ConvertJson {  #region 私有方法  /// <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();  }  /// <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();   }   else if (type != typeof(string) && string.IsNullOrEmpty(str))   {    str = "\"" + str + "\"";   }   return str;  }  #endregion   #region list转换成JSON  /// <summary>  /// list转换为Json  /// </summary>  /// <typeparam name="T"></typeparam>  /// <param name="list"></param>  /// <returns></returns>  public static string ListToJson<T>(IList<T> list)  {   object obj = list[0];   return ListToJson<T>(list, obj.GetType().Name);  }  /// <summary>  /// list转换为json  /// </summary>  /// <typeparam name="T1"></typeparam>  /// <param name="list"></param>  /// <param name="p"></param>  /// <returns></returns>  private static string ListToJson<T>(IList<T> list, string JsonName)  {   StringBuilder Json = new StringBuilder();   if (string.IsNullOrEmpty(JsonName))    JsonName = list[0].GetType().Name;   Json.Append("{\"" + JsonName + "\":[");   if (list.Count > 0)   {    for (int i = 0; i < list.Count; i++)    {     T obj = Activator.CreateInstance<T>();     PropertyInfo[] pi = obj.GetType().GetProperties();     Json.Append("{");     for (int j = 0; 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 - 1)      {       Json.Append(",");      }     }     Json.Append("}");     if (i < list.Count - 1)     {      Json.Append(",");     }    }   }   Json.Append("]}");   return Json.ToString();  }  #endregion   #region 对象转换为Json  /// <summary>  /// 对象转换为json  /// </summary>  /// <param name="jsonObject">json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 = 0; i < propertyInfo.Length; i++)   {    object objectValue = http://www.mamicode.com/propertyInfo[i].GetGetMethod().Invoke(jsonObject, null);    string value = http://www.mamicode.com/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 - 1, jsonString.Length);   return jsonString + "}";  }  #endregion   #region 对象集合转换为json  /// <summary>  /// 对象集合转换为json  /// </summary>  /// <param name="array">对象集合</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 - 1, jsonString.Length);   return jsonString + "]";  }  #endregion   #region 普通集合转换Json  /// <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 - 1, jsonString.Length);   return jsonString + "]";  }  #endregion   #region DataSet转换为Json  /// <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 + "}";  }  #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 =http://www.mamicode.com/ 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("},");   }   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() + "\":" + StringFormat(dt.Rows[i][j].ToString(), type));      if (j < dt.Columns.Count - 1)      {       Json.Append(",");      }     }     Json.Append("}");     if (i < dt.Rows.Count - 1)     {      Json.Append(",");     }    }   }   Json.Append("]}");   return Json.ToString();  }  #endregion   #region DataReader转换为Json  /// <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 = 0; i < dataReader.FieldCount; i++)    {     Type type = dataReader.GetFieldType(i);     string strKey = dataReader.GetName(i);     string strValue =http://www.mamicode.com/ dataReader[i].ToString();     jsonString.Append("\"" + strKey + "\":");     strValue = StringFormat(strValue, type);     if (i < dataReader.FieldCount - 1)     {      jsonString.Append(strValue + ",");     }     else     {      jsonString.Append(strValue);     }    }    jsonString.Append("},");   }   dataReader.Close();   jsonString.Remove(jsonString.Length - 1, 1);   jsonString.Append("]");   return jsonString.ToString();  }  #endregion }