C＃中“.. ::。”的含义是什么？

Question

I saw this signature on the ListView class:

public ListView..::.ListViewItemCollection Items { get; }

When I saw that, "What?!"

I searched "dot dot colon colon dot" and "..::." on Google with no result.

Answer 1

That's not C#; that's JScript. In C#, it would be:

public ListView.ListViewItemCollection Items { get; }

It's a little different because ListViewItemCollection is an inner class of ListView.

I'm guessing that you saw this looking at ListView.Items Property (System.Windows.Forms) .

If you look at the listing for all the other languages, they're all listed with the JScript syntax. You've found a documentation bug.

Answer 2

ListViewItemCollection is a nested type of ListView, which means that in the code, the Collection class is defined inside of the ListView definition, like so:

public class ListView {
  public ListViewItemCollection Items {get;}

  public class ListViewItemCollection : IList {
    // more code here
  }
}

I would assume that it is coded this way just to keep their source tree a little bit cleaner. This way, all of the helper collection classes that are associated with the ListView control aren't scattered throughout the directory. Inner classes do have a few special characteristics, but none that I can imagine would apply here.