如何：创建可以由远程对象引发的异常类型

通过从 RemotingException 类派生并实现 ISerializable 接口，您可以创建可由远程对象引发并由远程调用方捕获的您自己的异常类型。

创建可由远程对象引发并由远程调用方捕获的异常类型

• 1. 定义从 RemotingException 类派生的类。

  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));

 }

示例

下面的代码示例提供了一个简单实现，该实现若经过配置，则可在远程服务器对象引发异常时复制回调用方。

<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
          + "\"";
            }
        }
    }

请参见

参考

ContextBoundObject

概念

可远程处理和不可远程处理的对象

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