c# convert system.IO.Stream to Byte[] [duplicate]

Question

I would like to know how to convert a stream to a byte.

I find this code, but in my case it does not work:

var memoryStream = new MemoryStream();
paramFile.CopyTo(memoryStream);
byte[] myBynary = memoryStream.ToArray();
myBinary = memoryStream.ToArray();

But in my case, in the line paramFile.CopyTo(memoryStream) it happens nothing, no exception, the application still works, but the code not continue with the next line.

Thanks.

Ah, sorry, param file is the parameter that I receive in the method, is a SystemIO.Stream. — Álvaro García
– Álvaro García, Commented Jun 29, 2012 at 17:37

JamieSee · Accepted Answer · 2012-06-29 17:41:42Z

44

If you are reading a file just use the File.ReadAllBytes Method:

byte[] myBinary = File.ReadAllBytes(@"C:\MyDir\MyFile.bin");

Also, there is no need to CopyTo a MemoryStream just to get a byte array as long as your sourceStream supports the Length property:

byte[] myBinary = new byte[paramFile.Length];
paramFile.Read(myBinary, 0, (int)paramFile.Length);

edited Jun 29, 2012 at 17:41

answered Jun 29, 2012 at 17:25

JamieSee

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2 Comments

Álvaro García Over a year ago

really I have a stream, no the file. Although the original data is a file, but I send the file into the stream in the WCF. So I need to convert the stream to a byte[]. But this way not works, because the length property is a long, and the read method use an int.

JamieSee Over a year ago

As long as you don't exceed 2147483647 (int.MaxValue) bytes this works fine. Otherwise you have to assemble the array with a counter.

Athens Holloway · Accepted Answer · 2012-06-29 17:24:44Z

44

This is an extension method i wrote for the Stream class

 public static class StreamExtensions
    {
        public static byte[] ToByteArray(this Stream stream)
        {
            stream.Position = 0;
            byte[] buffer = new byte[stream.Length];
            for (int totalBytesCopied = 0; totalBytesCopied < stream.Length; )
                totalBytesCopied += stream.Read(buffer, totalBytesCopied, Convert.ToInt32(stream.Length) - totalBytesCopied);
            return buffer;
        }
    }

answered Jun 29, 2012 at 17:24

Athens Holloway

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2 Comments

Jason Hartley Over a year ago

Athens, I don't suppose you have an extra FromByteArray method laying around? :-) I'm using your method, I just need to be able to convert it back now.

Athens Holloway Over a year ago

This may help. stackoverflow.com/questions/4736155/…

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