Question

Given a type T, is there any way to write something equivalent of

if (typeof(T).ImplementsProperty(MaxValue))
{
    return T ?? typeof(T).MaxValue;
}
else
    return T;

Note that I don’t need a generic type constraint on the class or method, I just need a conditional in the method body. T in this case can be any IComparable. I’m trying to get null numeric/date types to be ordered with the nulls occurring last.

Edit: Sorry there is an error in the above syntax as pointed out by Ray. It should be returning value ?? typeof(T).MaxValue given a T value or something like that. Hope thats clear.

Answer 1

This seems to work for me for nullable, value and reference types:

public T GetSelfOrMaxValue<T>(T value)
{
    var t = Nullable.GetUnderlyingType(typeof(T)) ?? typeof(T);
    var fi = t.GetField("MaxValue");
    if (fi != null && fi.IsStatic && fi.FieldType.Equals(t))
    {
        return (T)fi.GetValue(null);
    }
    return value;
}

Is this what you wanted?