Dns.BeginGetHostEntry Method (String, AsyncCallback, Object)
Asynchronously resolves a host name or IP address to an IPHostEntry instance.
Assembly: System (in System.dll)
[<HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)>] static member BeginGetHostEntry : hostNameOrAddress:string * requestCallback:AsyncCallback * stateObject:Object -> IAsyncResult
- Type: System.String
The host name or IP address to resolve.
- Type: System.AsyncCallback
An AsyncCallback delegate that references the method to invoke when the operation is complete.
- 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.
hostNameOrAddress is a null reference (Nothing in Visual Basic).
The length of hostNameOrAddress is greater than 255 characters.
An error is encountered when resolving hostNameOrAddress.
hostNameOrAddress is an invalid IP address.
The BeginGetHostEntry method queries a DNS server for the IP address that is associated with a host name or IP address.
Note This member emits trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.
This method does not block until the operation is complete. To block until the operation is complete, use the GetHostEntry method.
For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously.
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.