HOW TO：建立可由遠端物件擲回的例外狀況類型

您可以藉由從 RemotingException 類別衍生並實作 ISerializable 介面，建立可由遠端物件擲回並由遠端呼叫端攔截的例外狀況類型。

若要建立可由遠端物件擲回並由遠端呼叫端攔截的例外狀況類型

• 1.定義一個衍生自 RemotingException 類別的類別。

  Public Class RemotableType
     Inherits MarshalByRefObject
  

      Implements ISerializable

' ...
End Class 'RemotableType

    Public Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        _internalMessage = info.GetValue("_internalMessage", GetType(String))

    End Sub

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

 }

範例

下列程式碼範例提供一個簡單的實作，一旦經過設定，此實作就會在遠端伺服器物件將它擲回時複製回呼叫端。

<Serializable()> Public Class CustomRemotableException
    Inherits RemotingException
    Implements ISerializable

    Private _internalMessage As String

    Public Sub New()
        _internalMessage = String.Empty
    End Sub

    Public Sub New(ByVal message As String)
        _internalMessage = message
    End Sub

    Public Sub New(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        _internalMessage = info.GetValue("_internalMessage", GetType(String))
    End Sub

    Public Overrides Sub GetObjectData(ByVal info As SerializationInfo, ByVal context As StreamingContext)
        info.AddValue("_internalMessage", _internalMessage)
    End Sub

    Public Overrides 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

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