如何建立遠端物件可擲回的例外狀況類型

從 RemotingException 衍生物件並實作 ISerializable 介面，即可建立遠端物件可擲回、遠端呼叫端可攔截的自訂例外狀況類型。

建立遠端物件可擲回且遠端呼叫端可攔截的例外狀況類型

1. 定義從 RemotingException 類別衍生的類別。

   Public Class RemotableType
      Inherits MarshalByRefObject
   End Class 'RemotableType
   

   public class RemotableType : MarshalByRefObject{
   }
   

2. 將 SerializableAttribute 屬性放在類別上。

   <Serializable()> Public Class CustomRemotableException
       Inherits RemotingException
       End Class
   

   [Serializable]
   public class CustomRemotableException : RemotingException, ISerializable {
       }
   

3. 實作使用 SerializationInfo 物件和 StreamingContext 物件做為參數的還原序列化建構函式。

範例

下列程式碼範例提供當被遠端伺服器物件擲回時，會複製回呼叫端的簡單實作 (如果已設定)。

<Serializable()> Public Class CustomRemotableException
  Inherits RemotingException
  Private _internalMessage As String
  Public Sub CustomRemotableException()
      _internalMessage = String.Empty
  End Sub

  Public Sub CustomRemotableException(ByVal message As String)
      _internalMessage = message
  End Sub
  Public Sub CustomRemotableException(ByVal info As _
      SerializationInfo, ByVal context As StreamingContext)
      _internalMessage = info.GetValue("_internalMessage", _
                                  _internalMessage.GetType())
  End Sub
  Public Overrides Sub GetObjectData(ByVal info As SerializationInfo, _
                                   ByVal context As StreamingContext)
       info.AddValue("_internalMessage", _internalMessage)
  End Sub
  Public Shadows ReadOnly Property Message() As String
    Get
     Return "This is your custom remotable exception returning: \"" " + 
                                              _internalMessage + "\"";"
    End Get
  End Property
End Class

[Serializable]
public class CustomRemotableException : RemotingException, ISerializable {
   private string _internalMessage;

   public CustomRemotableException(){
      _internalMessage = String.Empty;
   }
   
   public CustomRemotableException(string message){
      _internalMessage = message;
   }
   
   public CustomRemotableException(SerializationInfo info, StreamingContext context){
      _internalMessage = (string)info.GetValue("_internalMessage", typeof(string));
   }

   public override void GetObjectData(SerializationInfo info, StreamingContext context){
      info.AddValue("_internalMessage", _internalMessage);
   }

   // Returns the exception information. 
   public override string Message{
      get {
            return "This is your custom remotable exception returning: \"" 
      + _internalMessage 
      + "\"";
      }
   }
}

請參閱

參考

ContextBoundObject

概念

可遠端處理和不可遠端處理的物件

其他資源

不可遠端處理的物件