TcpClient.ConnectAsync Method (IPAddress, Int32)
Connects the client to a remote TCP host using the specified IP addresses and port number as an asynchronous operation.
Assembly: System (in System.dll)
[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)] public Task ConnectAsync( IPAddress addresses, int port )
- Type: System.Net.IPAddress
The IPAddress array of the host to which you intend to connect.
- Type: System.Int32
The port number to which you intend to connect.
The ipAddresses parameter is null.
The port number is not valid.
An error occurred when attempting to access the socket. See the Remarks section for more information.
The Socket has been closed.
A caller higher in the call stack does not have permission for the requested operation.
This operation will not block. The returned Returns Task object will complete after the TCP connection has been established. This method does not block the calling thread while the connection request is underway.
This method is typically used immediately after a call to the BeginGetHostAddresses method, which can return multiple IP addresses for a single host. Call this method to establish a synchronous remote host connection to the host specified by the array of IPAddress elements and the port number as an asynchronous operation. After connecting with the remote host, use the GetStream method to obtain the underlying NetworkStream. Use this NetworkStream to send and receive data.
If you receive a SocketException, use SocketException.ErrorCode to obtain the specific error code. After you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation in the MSDN library at http://msdn.microsoft.com/library for a detailed description of the error.
This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.
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.
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.