Using the new() constraint is a symptom of the XY problem

Mon, 26 Dec 2016 20:00:00 +0300

C# allows you to write generic code with a few constraints that can’t be expressed through the type hierarchy alone. For example, you can require that a generic type parameter only accepts types that are structs, or reference types, or non-abstract types that have a public default constructor:

public void M<T1, T2, T3>()
    where T1 : struct
    where T2 : class
    where T3 : new()
{
    /* code */
}

That last case is what we’re interested in for this post.

delegates on Mature Pessimizations - A programming blog by Theodoros Chatzigiannakis

Using the new() constraint is a symptom of the XY problem