How to open a file from Memory Stream

Is it possible to open a file directly from a MemoryStream opposed to writing to disk and doing Process.Start() ? Specifically a pdf file? If not, I guess I need to write the MemoryStream to disk (which is kind of annoying). Could someone then point me to a resource abou开发者_如何转开发t how to write a MemoryStream to Disk?

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It depends on the client :) if the client will accept input from stdin you could push the dta to the client. Another possibility might be to write a named-pipes server or a socket-server - not trivial, but it may work.

However, the simplest option is to just grab a temp file and write to that (and delete afterwards).

var file = Path.GetTempFileName();
using(var fileStream = File.OpenWrite(file))
{
    var buffer = memStream.GetBuffer();
    fileStream.Write(buffer, 0, (int)memStream.Length);
}

Remember to clean up the file when you are done.

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Path.GetTempFileName() returns file name with '.tmp' extension, therefore you cant't use Process.Start() that needs windows file association via extension.

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If by opening a file, you mean something like starting Adobe Reader for PDF files, then yes, you have to write it to a file. That is, unless the application provides you with some API do that.

One way to write a stream to file would be:

using (var memoryStream = /* create the memory stream */)
using (var fileStream = File.OpenWrite(fileName))
{
    memoryStream.WriteTo(fileStream);
}