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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.io.stream.copytoasync below:

Stream.CopyToAsync Method (System.IO) | Microsoft Learn

Source:

Stream.cs

Source:

Stream.cs

Source:

Stream.cs

Source:

Stream.cs

Asynchronously reads the bytes from the current stream and writes them to another stream, using a specified buffer size and cancellation token. Both streams positions are advanced by the number of bytes copied.

public:
 virtual System::Threading::Tasks::Task ^ CopyToAsync(System::IO::Stream ^ destination, int bufferSize, System::Threading::CancellationToken cancellationToken);

public virtual System.Threading.Tasks.Task CopyToAsync(System.IO.Stream destination, int bufferSize, System.Threading.CancellationToken cancellationToken);

[System.Runtime.InteropServices.ComVisible(false)]
public virtual System.Threading.Tasks.Task CopyToAsync(System.IO.Stream destination, int bufferSize, System.Threading.CancellationToken cancellationToken);

abstract member CopyToAsync : System.IO.Stream * int * System.Threading.CancellationToken -> System.Threading.Tasks.Task
override this.CopyToAsync : System.IO.Stream * int * System.Threading.CancellationToken -> System.Threading.Tasks.Task

[<System.Runtime.InteropServices.ComVisible(false)>]
abstract member CopyToAsync : System.IO.Stream * int * System.Threading.CancellationToken -> System.Threading.Tasks.Task
override this.CopyToAsync : System.IO.Stream * int * System.Threading.CancellationToken -> System.Threading.Tasks.Task

Public Overridable Function CopyToAsync (destination As Stream, bufferSize As Integer, cancellationToken As CancellationToken) As Task

destination

Stream

The stream to which the contents of the current stream will be copied.

bufferSize

Int32

The size, in bytes, of the buffer. This value must be greater than zero. The default size is 81920.

cancellationToken

CancellationToken

The token to monitor for cancellation requests. The default value is None.

A task that represents the asynchronous copy operation.

Attributes

bufferSize is negative or zero.

Either the current stream or the destination stream is disposed.

The current stream does not support reading, or the destination stream does not support writing.

The cancellation token was canceled. This exception is stored into the returned task.

The CopyToAsync method enables you to perform resource-intensive I/O operations without blocking the main thread. This performance consideration is particularly important in a Windows 8.x Store app or desktop app where a time-consuming stream operation can block the UI thread and make your app appear as if it is not working. The async methods are used in conjunction with the async and await keywords in Visual Basic and C#.

If the operation is canceled before it completes, the returned task contains the Canceled value for the Status property.

Copying begins at the current position in the current stream.

For an example of copying between two streams, see the CopyToAsync(Stream) overload.

This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as ArgumentException, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by CopyTo(Stream, Int32).

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