How can I split (copy) a Stream in .NET?

Question

Does anyone know where I can find a Stream splitter implementation?

I\'m looking to take a Stream, and obtain two separate streams that can be independently read a

Answer 1

I have made a SplitStream available on github and NuGet.

It goes like this.

using (var inputSplitStream = new ReadableSplitStream(inputSourceStream))

using (var inputFileStream = inputSplitStream.GetForwardReadOnlyStream())
using (var outputFileStream = File.OpenWrite("MyFileOnAnyFilestore.bin"))

using (var inputSha1Stream = inputSplitStream.GetForwardReadOnlyStream())
using (var outputSha1Stream = SHA1.Create())
{
    inputSplitStream.StartReadAhead();

    Parallel.Invoke(
        () => {
            var bytes = outputSha1Stream.ComputeHash(inputSha1Stream);
            var checksumSha1 = string.Join("", bytes.Select(x => x.ToString("x")));
        },
        () => {
            inputFileStream.CopyTo(outputFileStream);
        },
    );
}

I have not tested it on very large streams, but give it a try.

github: https://github.com/microknights/SplitStream