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PowerTCP Email Validation for .NET |
| Dart.PowerTCP.EmailValidation Namespace > DnsEventArgs Class : Exception Property (DnsEventArgs) |
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PowerTCP Email Validation for .NET |
| Dart.PowerTCP.EmailValidation Namespace > DnsEventArgs Class : Exception Property (DnsEventArgs) |
Gets any exception which occurred during the asynchronous operation.
[Visual Basic]
Public ReadOnly Property Exception As Exception[C#]
public Exception Exception {get;}[C++]
public: __property Exception* get_Exception();If any exception occurred during the asynchronous operation, this property will contain an Exception object describing the exception.
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.
The following example demonstrates using the Dns control to asynchronously resolve a domain name.
[Visual Basic]
Private Sub AsynchResolveTest()
Dns1.Server = "206.64.128.5"
Dns1.BeginGetHost("www.dart.com", Nothing)
End Sub
Private Sub Dns1_EndGetHost(ByVal sender As Object, ByVal e As DnsEventArgs) Handles Dns1.EndGetHost
' Check for any exceptions that occurred
If e.Exception Is Nothing Then
DisplayResult(e.Host)
End If
End Sub
Private Sub DisplayResult(ByVal result As System.Net.IPHostEntry)
' Display host name
Debug.WriteLine("Host name: " + result.HostName)
' Display addresses, if any
Dim add As System.Net.IPAddress
For Each add In result.AddressList
Debug.WriteLine("Address: " + add.ToString())
Next
' Display aliases, if any
Dim s As String
For Each s In result.Aliases
Debug.WriteLine("Aliases: " + s)
Next
End Sub
[C#]
private void AsynchResolveTest()
{
dns1.Server = "206.64.128.5";
dns1.BeginGetHost("www.dart.com", null);
}
private void dns1_EndGetHost(object
sender, DnsEventArgs e)
{
// Check for any exceptions that occurred
if(e.Exception == null)
{
DisplayResult(e.Host);
}
}
private void DisplayResult(System.Net.IPHostEntry result)
{
// Display host name
Debug.WriteLine("Host name: " + result.HostName);
// Display addresses, if any
foreach(System.Net.IPAddress add in result.AddressList)
Debug.WriteLine("Address: " + add.ToString());
// Display aliases, if any
foreach(string s in result.Aliases)
Debug.WriteLine("Aliases: " + s);
}
Platforms: Windows 98, Windows NT 4.0, Windows ME, Windows 2000, Windows XP, Windows Server 2003, Windows Vista
DnsEventArgs Class | DnsEventArgs Members
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Documentation version 1.0.3.0.
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