显示弹出框时TextBox失去焦点

Question

I try to implement something similar to Intellisense: while the user enters text in a (WinForms) TextBox, I'd like to display suggestions.

Currently, I'm doing something like this in the TextChanged-EventHandler of the TextBox:

        ListBox lb = new ListBox();
        lb.Items.Add(new DataItem() { Id = "1", DisplayText = "Abc" });
        lb.Items.Add(new DataItem() {Id = "2", DisplayText = "Abuiaec"});


        ToolStripDropDown popup = new ToolStripDropDown();
        popup.Margin = Padding.Empty;
        popup.Padding = Padding.Empty;
        ToolStripControlHost host = new ToolStripControlHost(lb);
        host.Margin = Padding.Empty;
        host.Padding = Padding.Empty;
        popup.Items.Add(host);
        popup.Show(this, Point.Empty);

However, as soon as the popup comes up, the TextBox loses its focus. The popup does not get focus - it seems like the focus disappears completely.

What can I do against this behavior?

Thanks!

Answer 1

尝试在最后添加textbox.Select()以将焦点放在textbox上。