Empty array with BinaryReader on UploadedFile in c#

Assume the following code:

Stream file开发者_如何转开发 = files[0].InputStream;

var FileLen = files[0].ContentLength;

var b = new BinaryReader(file);
var bytes = b.ReadBytes(FileLen);

If I upload a CSV file that is 10 records ( 257 bytes ), the BinaryReader fills the array of bytes with "0".

I also wrote a loop to step through the ReadByte Method of the BinaryReader and in the first iteration of the loop, I received the following exception:

Unable to read beyond the end of the stream

When I increase the CSV file to 200 hundred records, everything worked just fine.

The question is then, Why does this happen on smaller files, and is there a workaround that allows the Binary read of smaller files.

Not sure why, but when you are using BinaryReader on an uploaded stream, the start position needs to be explicitly set.

b.BaseStream.Position = 0;