C# if-null-then-null expression

Question

Just for curiosity/convenience: C# provides two cool conditional expression features I know of:

string trimmed = (input == null) ? null : input.Trim();
         


        

Answer 1

As a workaround you can use this which is based on Maybe monad.

public static Tout IfNotNull(this Tin instance, Func Output)
{
    if (instance == null)
        return default(Tout);
    else
        return Output(instance);
}

Use it this way:

int result = objectInstance.IfNotNull(r => 5);
var result = objectInstance.IfNotNull(r => r.DoSomething());