c# - C#, default parameter value for an IntPtr

Question

I'd like to use a default parameter value of IntPtr.Zero in a function that takes an IntPtr as an argument. This is not possible as IntPtr.Zero is not a compile time constant.

Is there any way I can do what I want?

Answer 1

说得委婉些，有点不直观，你可以通过使用new运算符来获得它：

    void Foo(IntPtr arg = new IntPtr()) { 
    }

那是为了好玩，你可能更喜欢这个：

    void Foo(IntPtr arg = default(IntPtr)) { 
    }

Answer 2

既然IntPtr是一个结构，你可以使用 Nullable-of-T 吗？

static void SomeMethod(IntPtr? ptr = null) {
    var actualPtr = ptr ?? IntPtr.Zero;
    //...
 }