你的位置:首页 > ASP.net教程

[ASP.net教程]C#中对象,字符串,dataTable、DataReader、DataSet,对象集合转换成Json字符串方法。


C#中对象,字符串,dataTable、DataReader、DataSet,对象集合转换成Json字符串方法。

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 = 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 - 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 = 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 = 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

摘自:http://www.cnblogs.com/wggWeb/archive/2012/03/31/2427078.html