从 asp.net ListBox 中获取所有选定的项目

问题描述

任何人都知道使用扩展方法获取列表框控件中所有选定项的流畅方法吗?

Anyone know of a smooth way to get all of the selected items in a listbox control by using extension methods?

并且，请不要让我争论 它与如何获得这样的列表无关，因为最终一切都使用循环来迭代项目并找到选定的项目.

And, please, spare me the argument of it's irrelevant as to how one gets such a list because in the end everything uses a loop to iterate over the items and find the selected ones anyway.

推荐答案

var selected = yourListBox.Items.GetSelectedItems();
//var selected = yourDropDownList.Items.GetSelectedItems();
//var selected = yourCheckBoxList.Items.GetSelectedItems();
//var selected = yourRadioButtonList.Items.GetSelectedItems();

public static class Extensions
{
    public static IEnumerable<ListItem> GetSelectedItems(
           this ListItemCollection items)
    {
        return items.OfType<ListItem>().Where(item => item.Selected);
    }
}

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