我在绑定到数据源 (BindingList) 的窗体 (Windows 窗体) 上有一个所有者绘制的 ListBox.我需要提供一个选项来快速选择所有项目(最多 500000 个).
I have an ownerdrawn ListBox on a form (Windows Forms) binding to a datasource (BindingList). I need to provide an option to select all items (up to 500000) really fast.
这就是我目前正在做的事情:
This is what I am currently doing:
for (int i = 0; i < listBox.Items.Count; i++)
listBox.SetSelected(i, true);
这非常慢并且不可接受.有人知道更好的解决方案吗?
This is incredibly slow and not acceptable. Does anybody know a better solution?
假设这是一个 Windows 窗体
问题:Windows 窗体将在每个选定项之后绘制更改.要禁用绘图并在完成后启用它,请使用 BeginUpdate()
和 EndUpdate()
方法.
Assuming this is a Windows Forms
problem: Windows Forms will draw changes after each selected item. To disable drawing and enable it after you're done use the BeginUpdate()
and EndUpdate()
methods.
listBox.BeginUpdate();
for (int i = 0; i < listBox.Items.Count; i++)
listBox.SetSelected(i, true);
listBox.EndUpdate();
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