BeginGetHostAddresses

Asynchronously returns the Internet Protocol (IP) addresses for the specified host.

Syntax

public static IAsyncResult BeginGetHostAddresses (string hostNameOrAddress, AsyncCallback requestCallback, object state)

Parameters

hostNameOrAddress
The host name or IP address to resolve.
requestCallback
An AsyncCallback delegate that references the method to invoke when the operation is complete.
state
A user-defined object that contains information about the operation. This object is passed to the requestCallback delegate when the operation is complete.

Returns

An IAsyncResult instance that references the asynchronous request.

Remarks

The Dns.BeginGetHostAddresses(string, AsyncCallback, object) method asynchronously queries a DNS server for the IP addresses that are associated with a host name. If hostNameOrAddress is an IP address, this address is returned without querying the DNS server.

Note:

This member emits trace information when you enable network tracing in your application. For more information, see Network Tracing.

When an empty string is passed as the host name, this method returns the IPv4 addresses of the local host for all operating systems except Windows Server 2003; for Windows Server 2003, both IPv4 and IPv6 addresses for the local host are returned.

The asynchronous Dns.BeginGetHostAddresses(string, AsyncCallback, object) operation must be completed by calling the Dns.EndGetHostAddresses(IAsyncResult) 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 Dns.GetHostAddresses(string) method.

For more information about using the asynchronous programming model, see Asynchronous Programming Overview

Requirements

Namespace: System.Net
Assembly: System (in System.dll)
Assembly Versions: 2.0.0.0, 4.0.0.0