Generics used in struct vs class

Question

Assume that we have the following struct definition that uses generics:

public struct Foo
{
    public T First; 
    public T Second;

             


        

Answer 1

That is because a compiler rule enforces that all fields in a struct must be assigned before control leaves any constructor.

You can get your code working by doing this:

public Foo(T first)
{
    this.First = first;
    this.Second = default(T);
}

Also see Why Must I Initialize All Fields in my C# struct with a Non-Default Constructor?