textBox中嵌入在ListBox最初的焦点 [英] textBox embedded in a ListBox initial focus
本文介绍了textBox中嵌入在ListBox最初的焦点的处理方法,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小编来一起学习吧!
问题描述
我想将焦点设置到这是一个文本框的第一个列表框项目。我希望能够在这immedatelly写不necesity点击它或按任意键。我尝试这一点,但不工作:
私人无效Window_Loaded(对象发件人,RoutedEventArgs E)
{
listBox1.Items.Add(新文本框(){});
(listBox1.Items [0]作为文本框)。重点();
}
解决方案
这是愚蠢的但它只能如果你稍等一下,试试这个版本:
使用系统;使用System.Windows
;使用System.Windows.Controls的
;
命名空间WpfApplication1
{
公共部分类主窗口:窗口
{
公共主窗口()
{
的InitializeComponent() ;
}
私人无效Window_Loaded(对象发件人,RoutedEventArgs E)
{
变种的textBox =新的TextBox(){};
listBox1.Items.Add(的textBox);
System.Threading.ThreadPool.QueueUserWorkItem(
(A)=>
{
System.Threading.Thread.Sleep(100);
textBox.Dispatcher.Invoke(
System.Windows.Threading.DispatcherPriority.Normal,
新的行动(
委托()
{
textBox.Focus();
}
));
}
);
}
}
}
我在本地测试,并可能不解决这个问题,直到我发现在那里这个问题,答案fuzquat投票等等我在这里和他在那里:D
的孩子
I want to set the focus to the first ListBox item that is a textbox. I want to be able to write in it immedatelly without the necesity to click it or press any key. I try this but doesn't work:
private void Window_Loaded(object sender, RoutedEventArgs e)
{
listBox1.Items.Add(new TextBox() { });
(listBox1.Items[0] as TextBox).Focus();
}
解决方案
it's stupid but it works only if you wait a moment, try this version:
using System;
using System.Windows;
using System.Windows.Controls;
namespace WpfApplication1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
var textBox = new TextBox() {};
listBox1.Items.Add(textBox);
System.Threading.ThreadPool.QueueUserWorkItem(
(a) =>
{
System.Threading.Thread.Sleep(100);
textBox.Dispatcher.Invoke(
System.Windows.Threading.DispatcherPriority.Normal,
new Action(
delegate()
{
textBox.Focus();
}
));
}
);
}
}
}
I was testing locally and could not fix it until I found this question and fuzquat answer in there so vote me here and him there :D
WPF - Can't set focus to a child of UserControl
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