| Visual Basic (Declaration) | |
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Public ReadOnly Property Exception As Exception | |
| Visual Basic (Usage) | Copy Code |
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Dim instance As SegmentEventArgs Dim value As Exception value = instance.Exception | |
| C# | |
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public Exception Exception {get;} | |
| Managed Extensions for C++ | |
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public: __property Exception* get_Exception(); | |
| C++/CLI | |
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public: property Exception^ Exception { Exception^ get(); } | |
Property Value
If any exception occurred during the asynchronous operation, this property will contain an Exception object describing the exception.The following example demonstrates asynchronous receiving and sending of data.
| Visual Basic | Copy Code |
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Private Sub AsynchTcpDemo() ' Attempt to connect to an echo port. Try Tcp1.Connect("myserver", 7) Catch ex As Exception Return End Try ' Send data, since we are connected to an echo port, the same data should be returned. ' The following code demonstrates asynchronously sending data. When data has been sent ' the EndSend event will be raised. Dim buffer() As Byte = System.Text.Encoding.Default.GetBytes("a") Tcp1.BeginSend(buffer, 0, buffer.Length, Net.Sockets.SocketFlags.None, Nothing) End Sub Private Sub Tcp1_EndSend(ByVal sender As Object, ByVal e As Dart.PowerTCP.SegmentEventArgs) Handles Tcp1.EndSend ' Check for exception If e.Exception Is Nothing Then ' Send is complete. Display info about the data sent. Debug.WriteLine("Byte count sent: " + e.Segment.Count) Debug.WriteLine("Data sent: " + e.Segment.ToString()) Dim buffer(Tcp1.ReceiveBufferSize) As Byte ' Receive the data. The EndReceive event will be raised upon completion. Tcp1.BeginReceive(buffer, 0, buffer.Length, Net.Sockets.SocketFlags.None, Nothing) End If End Sub Private Sub Tcp1_EndReceive(ByVal sender As Object, ByVal e As Dart.PowerTCP.SegmentEventArgs) Handles Tcp1.EndReceive ' Check for exception If e.Exception Is Nothing Then ' Receive is complete. Display info about the data sent. Debug.WriteLine("Byte count received: " + e.Segment.Count) Debug.WriteLine("Data received: " + e.Segment.ToString()) ' Close the connection Tcp1.Close() End If End Sub | |
| C# | Copy Code |
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private void AsynchTcpDemo() { // Attempt to connect to an echo port. try { tcp1.Connect("myserver", 7); } catch(Exception ex) {return;} // Send data, since we are connected to an echo port, the same data should be returned. // The following code demonstrates asynchronously sending data. When data has been sent // the EndSend event will be raised. byte[] buffer = System.Text.Encoding.Default.GetBytes("a"); tcp1.BeginSend(buffer, 0, buffer.Length, System.Net.Sockets.SocketFlags.None, null); } private void tcp1_EndSend(object sender, Dart.PowerTCP.SegmentEventArgs e) { // Check for exception if(e.Exception == null) { // Send is complete. Display info about the data sent. Debug.WriteLine("Byte count sent: " + e.Segment.Count); Debug.WriteLine("Data sent: " + e.Segment.ToString()); byte[] buffer = new byte[tcp1.ReceiveBufferSize]; // Receive the data. The EndReceive event will be raised upon completion. tcp1.BeginReceive(buffer, 0, buffer.Length, System.Net.Sockets.SocketFlags.None, null); } } private void tcp1_EndReceive(object sender, Dart.PowerTCP.SegmentEventArgs e) { // Check for exception if(e.Exception == null) { // Receive is complete. Display info about the data sent. Debug.WriteLine("Byte count received: " + e.Segment.Count); Debug.WriteLine("Data received: " + e.Segment.ToString()); // Close the connection tcp1.Close(); } } | |
Check this property to tell if an exception occurred during the asynchronous operation. If this property is null, no exception occurred.
The exception property is useful for checking exceptions and handling them appropriately. For example, if a bad command was sent to the server, a ProtocolException may be thrown. You could check this property to see if it was of type ProtocolException, than handle appropriately.
Target Platforms: Microsoft .NET Framework 2.0
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