How to Efficiently Copy Stream Contents in .NET?

The efficient replication method of the content of the stream content

In programming, copying the content of a stream to another is a common operation. .NET provides several methods to implement this operation.

Use Stream.copytoasync method (.NET 4.5)

.NET 4.5 Stream.copytoasync method introduced a method of asynchronous replication flow content:

This method returns a task, which can wait for it to complete to ensure that the operation is completed. It maintains the context and allows the follow -up code to continue to execute on the same thread.

<code class="language-csharp">input.CopyToAsync(output);</code>

Use the Stream.copyto method (.NET 4.0)

In the .NET 4.0 and higher versions, the Stream.copyto method provided a synchronous copy of the flow:

Customized implementation of the customization of .NET 3.5 and earlier versions

<code class="language-csharp">input.CopyTo(output);</code>

For the previous version of the .NET 3.5, there was no built -in method. You must use the loop manual copy content:

Precautions

<code class="language-csharp">public static void CopyStream(Stream input, Stream output)
{
    byte[] buffer = new byte[32768];
    int read;
    while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
    {
        output.Write(buffer, 0, read);
    }
}</code>

The buffer size in CopyStream can be adjusted to optimize performance.

Please note that the length of the flow may not be available for some stream realization.

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