Question

I’m working on a class called PByte, which should represent an int value between 32 an 126. (PByte = Printable Byte.)
Now I want to prevent the user of the class to initializing an object incorrectly, but I don’t want to throw an exception, I just want that Visual Studio doesn’t compile, like it happens when you try to do this: byte b = 256;

sealed class PByte : IEquatable<PByte>, IComparable, IComparable<PByte>
{
    public PByte(int value)
    {
        /* if (value < 32 || value > 126)
            throw new ArgumentException("\"" + value + "\" is not a valid PByte-value"); */ 
        this._value = value;
    }

[...]

I’ve also implemented this:

[...] 

    public static implicit operator PByte(int value)
    {
    /*  if (value < 32 || value > 126)
            throw new ArgumentException("\"" + value + "\" is not a valid PByte-value"); */
        return new PByte(value);
    }
}

So this should also be impossible:
PByte p = 2000;

Answer 1

You can’t enforce that at compile time without using code contracts. Even then, I think the code contracts only produce warnings and general puts the ownership of the problem on the calling scope.