Dns.BeginGetHostEntry Method (IPAddress, AsyncCallback, Object)

 
System_CAPS_noteNote

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Asynchronously resolves an IP address to an IPHostEntry instance.

Namespace:   System.Net
Assembly:  System (in System.dll)

[<HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)>]
static member BeginGetHostEntry : 
        address:IPAddress *
        requestCallback:AsyncCallback *
        stateObject:Object -> IAsyncResult

Parameters

address
Type: System.Net.IPAddress

The IP address to resolve.

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

address is null.

SocketException

An error is encountered when resolving address.

ArgumentException

address is an invalid IP address.

The BeginGetHostEntry method asynchronously queries a DNS server for the IP addresses and aliases associated with an 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.

The asynchronous BeginGetHostEntry operation must be completed by calling the EndGetHostEntry 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 GetHostEntry method.

For detailed information about using the asynchronous programming model, see Calling Synchronous Methods Asynchronously

The following code example uses the BeginGetHostEntry method to resolve an IP address to an IPHostEntry instance.

No code example is currently available or this language may not be supported.

DnsPermission

for accessing DNS information. Associated enumeration: PermissionState.Unrestricted

.NET Framework
Available since 2.0
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