如何投射 System.Windows.Controls.SelectedItemCollection? [英] How to cast a System.Windows.Controls.SelectedItemCollection?

问题描述

我有一个方法:

private void DeletePuzzle(object param) 
{
}

param 是一个 System.Windows.Controls.SelectedItemCollection，它是我从 WPF ListView 的 SelectedItems 属性中获得的.

param is a System.Windows.Controls.SelectedItemCollection, that I got from a WPF ListView's SelectedItems property.

不知何故，我似乎无法将它从一个对象转换为任何有用的东西.由于其保护级别，我无法创建 System.Windows.Controls.SelectedItemCollection，并且参数不会转换为 IList, ICollection或 IEnumerable.

Somehow, I can't seem to cast it from an object to anything useful. I can't create a System.Windows.Controls.SelectedItemCollection because of its protection level, and param won't cast to IList, ICollection or IEnumerable.

如何遍历参数的项目?

推荐答案

好的，整理好了.我一直试图把它像

Right, got it sorted. I kept trying to cast it like

IList<PuzzleViewModel> collection = (IList<PuzzleViewModel>)param;

告诉我它无法从 SelectedItemCollection 转换为 IList ...

Which told me it couldn't convert from SelectedItemCollection to IList...

这实际上是您需要做的.

This is in fact what you need to do.

System.Collections.IList items = (System.Collections.IList)param;
var collection = items.Cast<PuzzleViewModel>();

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