本文介绍了如何在 WinForms ListBox 上设置多个选定项的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着跟版网的小编来一起学习吧！
问题描述
我有一个处于多选模式的 System.Windows.Forms.ListBox 和一组我想被选中的项目.我该怎么做?
I have a System.Windows.Forms.ListBox in multiple selection mode and a set of items I'd like to be selected. How do I do that?
[Test]
public void SetListBox()
{
var listBox = new ListBox();
var items = new List<string>{"one", "two", "three", "four"};
listBox.SelectionMode = SelectionMode.MultiSimple;
listBox.Items.AddRange(items.ToArray());
var selectedItems = new List<string> {"two", "four"};
// ???
Assert.AreEqual(selectedItems, listBox.SelectedItems);
}
推荐答案
这样做:
selectedItems.Select(sd => listBox.Items.IndexOf(sd)).Where(i => i >= 0).ToList().ForEach(i => listBox.SetSelected(i, true));
为:
[Test]
public void SetListBox()
{
var listBox = new ListBox();
var items = new List<string>{"one", "two", "three", "four"};
listBox.SelectionMode = SelectionMode.MultiSimple;
listBox.Items.AddRange(items.ToArray());
var selectedItems = new List<string> {"two", "four"};
selectedItems.Select(sd => listBox.Items.IndexOf(sd)).Where(i => i >= 0).ToList().ForEach(i => listBox.SetSelected(i, true));
Assert.AreEqual(selectedItems, listBox.SelectedItems);
}
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