c# - 嵌入列表框初始焦点的文本框

Question

我想将焦点设置到第一个列表框项目(文本框)。我希望能够立即写入内容，而无需单击它或按任何键。我尝试了这个但不起作用:

        private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        listBox1.Items.Add(new TextBox() { });
        (listBox1.Items[0] as TextBox).Focus();

    }

Answer 1

这很愚蠢，但只有稍等片刻它才有效，试试这个版本:

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();
                            }
                            ));
                }
                );
        }
    }
}

我正在本地测试，直到我发现这个问题和 fuzquat 答案才修复它，所以在这里投票给我，在那里投票给他:D

Can't set focus to a child of UserControl