Question

I want to get a generic input to my function.

I tried

    interface IReport <T , T1>
    {
        List<T> GenerateReport<T1>();
    }

But i get warnings on the first T1 , that it was never used , and on second T1 that I declaring with the same name as other type parameter .

Any idea what I am doing wrong here ?

Answer 1

You don’t need to define T1 at the method, because it’s already defined at interface level.

This is correct:

interface IReport <T , T1>
{
    List<T> GenerateReport(T1 input);
}

Or this:

interface IReport <T>
{
    List<T> GenerateReport<T1>(T1 input);
}

See

Generic Methods