c# - Overloading a params function with an IEnumerable

Question

Suppose I have two functions:

Foo(params INotifyPropertyChanged[] items)
{
   //do stuff
}

Foo<T>(IEnumerable<T> items) where T : INotifyPropertyChanged
{
   Foo(items.ToArray());
}

The second one allows me to call Foo from a generic class with the constraint where T : INotifyPropertyChanged, but the second resolves to itself so I get a stack overflow exception.

1. Is it possible to specify which overload I want to call when there's some ambiguity?
2. Is there another way to call a params function from a generic class, assuming the generic type's constraints make it a viable option for the params type?

Thanks in advance!

Answer 1

你需要通过 a INotifyPropertyChanged[]，而不是 a T[]。
例如：

Foo<T>(IEnumerable<T> items) where T : INotifyPropertyChanged
{
   Foo(items.Cast<INotifyPropertyChanged>().ToArray());
}

但是，一般来说，最好IEnumerable从版本中调用params版本，如下所示：

Foo(params INotifyPropertyChanged[] items)
{
   Foo((IEnumerable<INotifyPropertyChanged>) items);
}

Foo<T>(IEnumerable<T> items) where T : INotifyPropertyChanged
{
   //do stuff
}

Answer 2

您可以尝试投射输入。

Foo<T>(IEnumerable<T> items) where T : INotifyPropertyChanged
{
   Foo(items.Cast<INotifyPropertyChanged>().ToArray());
}

如果这不起作用，我不知道，你可能不走运。