为什么编译器将bool转换为整数然后又返回bool而不是返回bool本身？

Question

I was reading VideoFileWriter class from AForge.Video.FFMPEG assembly via ILSPY (I was interested to see how a particular method works) and found this:

public bool IsOpen {
    [return: MarshalAs(UnmanagedType.U1)]
    get {
        return ((this.data != null) ? 1 : 0) != 0;
    }
}

What's the reason to do that bool to integer than back to bool conversion rather just do this.data != null ?

Answer 1

It is decompiled code, it is likely just a glitch of the decompiler.

---

After thinking for a bit, here is a reasonable implementation that may potentially turn in to the same compiled code

public enum ConnectionState
{
    Closed = 0,
    Open = 1,
    Opening = 2,
    OtherStuff = 3,
    AndSoOn = 4,
}

public bool IsOpen
{
    get
    {
        ConnectionState state;
        if (this.data != null)
        {
            state = ConnectionState.Open;
        }
        else
        {
            state = ConnectionState.Closed;
        }

        return state != ConnectionState.Closed;
    }
}