Dns::BeginGetHostByName Method (String^, AsyncCallback^, Object^)
Begins an asynchronous request for IPHostEntry information about the specified DNS host name.
Assembly: System (in System.dll)
public: [ObsoleteAttribute("BeginGetHostByName is obsoleted for this type, please use BeginGetHostEntry instead. http://go.microsoft.com/fwlink/?linkid=14202")] [HostProtectionAttribute(SecurityAction::LinkDemand, ExternalThreading = true)] static IAsyncResult^ BeginGetHostByName( String^ hostName, AsyncCallback^ requestCallback, Object^ stateObject )
Parameters
- hostName
-
Type:
System::String^
The DNS name of the host.
- requestCallback
-
Type:
System::AsyncCallback^
An AsyncCallback delegate that references the method to invoke when the operation is complete.
- stateObject
-
Type:
System::Object^
A user-defined object that contains information about the operation. This object is passed to the requestCallback delegate when the operation is complete.
Return Value
Type: System::IAsyncResult^An IAsyncResult instance that references the asynchronous request.
| Exception | Condition |
|---|---|
| ArgumentNullException | hostName is null. |
| SocketException | An error was encountered executing the DNS query. |
The asynchronous BeginGetHostByName operation must be completed by calling the EndGetHostByName method. Typically, the method is invoked by the requestCallback delegate.
This method does not block until the operation is complete. To block until the operation is complete, use the GetHostByName method.
For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously.
Note |
|---|
This member emits trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework. |
for accessing DNS information. Associated enumeration: PermissionState::Unrestricted
Available since 1.1
