Socket.EndSendFile(IAsyncResult) Method

Definition

Ends a pending asynchronous send of a file.

public void EndSendFile (IAsyncResult asyncResult);

Parameters

asyncResult
IAsyncResult

An IAsyncResult object that stores state information for this asynchronous operation.

Exceptions

.NET 8+ only: The socket is not connected to a remote host.

.NET Framework, .NET Core, and .NET 5-6 only: The Socket has been closed.

asyncResult is empty.

asyncResult was not returned by a call to the BeginSendFile(String, AsyncCallback, Object) method.

An error occurred when attempting to access the socket.

-or-

.NET 7+ only: The Socket has been closed.

Remarks

Important

This is a compatibility API. We don't recommend using the APM (Begin* and End*) methods for new development. Instead, use the Task-based equivalents.

EndSendFile completes the operation started by BeginSend. You need to pass the IAsyncResult created by the matching BeginSend call.

If you are using a connectionless protocol, EndSendFile blocks until the datagram is sent. If you are using a connection-oriented protocol, EndSendFile blocks until the entire file is sent. There is no guarantee that the data you send will appear on the network immediately. To increase network efficiency, the underlying system may delay transmission until a significant amount of outgoing data is collected. A successful completion of the BeginSendFile method means that the underlying system has had room to buffer your data for a network send.

Note

If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation for a detailed description of the error.

Note

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

Applies to

Product Versions
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1