如何避免在匿名方法块中使用out参数？

Func<int, int, int> add = (x, y) => x + y;
int result = add(1, 2);

int result;
Action<int, int> add = (x, y) => { result = x + y; };
add(1, 2);

public delegate Result AddResult(int x, int y);

public struct Result
{
    public int Sum { get; set; }
}

AddResult add = (x, y) => new Result { Sum = x + y };
Result result = add(1, 2);