Stream have diffrent size while debugging

Posted on 2009-07-01
Last Modified: 2012-05-07

I have a TestMethod to compare 2 streams using their bytes. here is part of the code (see code)

When debug this test then it pass, but when i just run it then i get the length differ fail assertion.

what is wrong in this code?
byte[] actual;

 byte[] expectedbytes;

using (MemoryStream actualstream = GenerateDocument(document, null, MpFunctionCode.NWPOF))


                    actualstream.Position = 0;

                    actual = actualstream.ToArray();



using (Stream expected = typeof(GeneratorTest).Assembly.GetManifestResourceStream("Generator.UnitTests.resources.ExpectedOutput.pdf"))


                expected.Position = 0;

                expectedbytes = WriteToByte(expected, (int)expected.Length);



AssertEqual(actual, expectedbytes);

private static void AssertEqual(byte[] actual, byte[] expectedbytes)


            if (actual.Length != expectedbytes.Length)

                Assert.Fail("Length differ:    Actual: " + actual.Length + "        Expected: " + expectedbytes.Length);

            for (int i = 0; i < expectedbytes.Length; i++)


                if (expectedbytes[i] != actual[i])

                    Assert.Fail("Not the same: " + actual[i] + " " + expectedbytes[i] + " index: " + i);



private static byte[] WriteToByte(Stream stream, int initialLength)


            stream.Position = 0;

            // If we've been passed an unhelpful initial length, just

            // use 32K.

            if (initialLength < 1)


                initialLength = 32768;


            byte[] buffer = new byte[initialLength];

            int read = 0;

            int chunk;

            while ((chunk = stream.Read(buffer, read, buffer.Length - read)) > 0)


                read += chunk;

                // If we've reached the end of our buffer, check to see if there's

                // any more information

                if (read == buffer.Length)


                    int nextByte = stream.ReadByte();

                    // End of stream? If so, we're done

                    if (nextByte == -1)


                        return buffer;


                    // Nope. Resize the buffer, put in the byte we've just

                    // read, and continue

                    byte[] newBuffer = new byte[buffer.Length * 2];

                    Array.Copy(buffer, newBuffer, buffer.Length);

                    newBuffer[read] = (byte)nextByte;

                    buffer = newBuffer;




            // Buffer is now too big. Shrink it.

            byte[] ret = new byte[read];

            Array.Copy(buffer, ret, read);


            return ret;


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Question by:kimos123
1 Comment

Accepted Solution

kimos123 earned 0 total points
ID: 24761059
nvm delete this

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