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POC# function returning a Stream
 

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    <p>Let me explain what I'm trying to do: I write a Filetype plugin for Paint.NET and I want the plugin to test various custom encoding methods and save the file with the method that produce the smallest filesize.</p> <p>Here is my actual code (simplified a lot just to demonstrate what I want to do). That worked, except, well, see the comment:</p> <pre class="lang-cs prettyprint-override"><code>private void encode1(Stream output) { output.WriteByte(0xAA); } private void encode2(Stream output) { output.WriteByte(0xAA); output.WriteByte(0xBB); } protected override void OnSave(Stream output) { if (saveSmallest) { // I can't find a clean way to test for the smallest stream size // and then use the encoder that produced the smallest stream... } else if (selectedEncoder == 1) { encode1(output); } else if (selectedEncoder == 2) { encode2(output); } } </code></pre> <p>So here is what I tried (also simplified but the idea is here), but it didn't work, nothing was written in the file in any cases and I have no idea why:</p> <pre class="lang-cs prettyprint-override"><code>private Stream encode1() { Stream output = new MemoryStream(); output.WriteByte(0xAA); return output; } private Stream encode2() { Stream output = new MemoryStream(); output.WriteByte(0xAA); output.WriteByte(0xBB); return output; } private void copyStream(Stream input, Stream output) { byte[] buffer = new byte[128]; int read; while ((read = input.Read(buffer, 0, buffer.Length)) &gt; 0) { output.Write(buffer, 0, read); } } protected override void OnSave(Stream output) { if (saveSmallest) { // get encoders's streams Stream[] outputs = { encode1(), encode2(), //other encoders here }; // Find the smallest stream int smallest = 0; for (int i = 1; i &lt; outputs.Length; i++) { if (outputs[i].Length &lt; outputs[smallest].Length) { smallest = i; } } //Copy the smallest into the final output //output = outputs[smallest]; copyStream(outputs[smallest], output); } else if (selectedEncoder == 1) { //output = encode1(); copyStream(encode1(), output); } else if (selectedEncoder == 2) { //output = encode2(); copyStream(encode2(), output); } } </code></pre> <p>I also tried working with bytes array instead of Stream, but the problem with bytes is that I must declare a byte array that is really big, because I have obviously no idea of how much bytes will be required to encode. It could be millions...</p> <p>I am beginner in C#. Please tell me why it doesn't work at all, and how I can fix it, or if you have any idea how to improve. But please don't write complex code that takes 2kb more once compiled, I would like the code to be small, simple and efficient. I feel better with lower level programming... Thanks in advance!</p>
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    1. COYou might want an array of `Func<Stream>` delegates
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    2. COThanks, I will look for delegates, never used them and I have no idea how they can be useful for me ^^
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