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From msdn:
FileSystem.ReadByte
The byte, cast to an Int32, or -1 if the end of the stream has been reached.
So -1 is basically a “magic value”. Does this mean the bytes returned from streams are never negative? If not, why not?
In C# the values of a
byteis a number between 0 and 255, so a byte is never negative.The
sbytedata type is a signed byte, so it has a value between -128 and 127.(In some other languages, for example Java, the
bytedata type is signed.)