The null-conditional operator is very useful when the method belongs to the object in question, but what if the object in question is an argument? For example, can this be shortened?

```
var someList = new List<SomeType>();
if (anotherList.Find(somePredicate) != null)
{
    someList.Add(anotherList.Find(somePredicate))
}

```

One solution I thought of was to use an extension method like below: 

```
public static void AddTo<T>(this T item, List<T> list)
{
    list.Add(item);
}

```

With that the first code block can be reduced to:

```
var someList = new List<SomeType>();
anotherList.Find(somePredicate)?.AddTo(someList);

```

But this solution is specific to this example (i.e. adding an object to a list if it's not null). Is there a general way to indicate that if a parameter is null, the method should not be run?