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Dns.GetHostAddressesAsync Method

.NET Framework 4.5

Returns the Internet Protocol (IP) addresses for the specified host as an asynchronous operation.

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

[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)]
public static Task<IPAddress[]> GetHostAddressesAsync(
	string hostNameOrAddress
)

Parameters

hostNameOrAddress
Type: System.String

The host name or IP address to resolve.

Return Value

Type: System.Threading.Tasks.Task<IPAddress[]>
Returns Task<TResult>.
The task object representing the asynchronous operation. The Result property on the task object returns an array of type IPAddress that holds the IP addresses for the host that is specified by the hostNameOrAddress parameter.

ExceptionCondition
ArgumentNullException

hostNameOrAddress is null.

ArgumentOutOfRangeException

The length of hostNameOrAddress is greater than 255 characters.

SocketException

An error is encountered when resolving hostNameOrAddress.

ArgumentException

hostNameOrAddress is an invalid IP address.

This operation will not block. The returned Task<TResult> object will complete after the hostNameOrAddress has been resolved.

This method queries a DNS server for the IP addresses associated with a host name. If hostNameOrAddress is an IP address, this address is returned without querying the DNS server.

NoteNote

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.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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