WPF如何动态创建文本框并在按钮单击时找到文本框？

我使用以下代码创建动态TextBox和Button动态:

Button btnClickMe = new Button();
btnClickMe.Content = "Click Me";
btnClickMe.Name = "btnClickMe";
btnClickMe.Click += new RoutedEventHandler(this.CallMeClick);

someStackPanel.Childern.Add(btnClickMe);

TextBox txtNumber = new TextBox();
txtNumber.Name = "txtNumber";
txtNumber.Text = "1776";

someStackPanel.Childern.Add(txtNumber);

我联系了Click Me按钮的点击事件.单击我按钮甚至被正确触发.但是我找不到TextBox我动态输入的内容.

这是我点击我的活动:

protected void ClickMeClick(object sender, RoutedEventArgs e)
{
    // Find the phone number
    TextBox txtNumber = this.someStackPanel.FindName("txtNumber") as TextBox;

    if (txtNumber != null)
    {
        string message = string.Format("The number is {0}", txtNumber.Text);

        MessageBox.Show(message);    
    }
    else
    {
        MessageBox.Show("Textbox is null");
    }
}

我该TextBox txtNumber怎么找到？

Josh G有修复此代码的线索:使用RegisterName().

这里有三个好处:

不使用成员变量来保存对动态创建的TextBox的引用.

编译.

完整的代码.

using System;
using System.Windows;
using System.Windows.Controls;

namespace AddControlsDynamically
{
    public partial class Window1 : Window
    {
        public void Window_Loaded(object sender, RoutedEventArgs e)
        {
            GenerateControls();
        }
        public void GenerateControls()
        {
            Button btnClickMe = new Button();
            btnClickMe.Content = "Click Me";
            btnClickMe.Name = "btnClickMe";
            btnClickMe.Click += new RoutedEventHandler(this.CallMeClick);
            someStackPanel.Children.Add(btnClickMe);
            TextBox txtNumber = new TextBox();
            txtNumber.Name = "txtNumber";
            txtNumber.Text = "1776";
            someStackPanel.Children.Add(txtNumber);
            someStackPanel.RegisterName(txtNumber.Name, txtNumber);
        }
        protected void CallMeClick(object sender, RoutedEventArgs e)
        {
            TextBox txtNumber = (TextBox) this.someStackPanel.FindName("txtNumber");
            string message = string.Format("The number is {0}", txtNumber.Text);
            MessageBox.Show(message);
        }
    }
}

另一种方法是将关联设置TextBox为Button Tag实例化时.

btnClickMe.Tag = txtNumber;

这样您就可以在事件处理程序中将其检索回来.

protected void ClickMeClick(object sender, RoutedEventArgs e)
{
    Button btnClickMe = sender as Button;
    if (btnClickMe != null)
    {
        TextBox txtNumber = btnClickMe.Tag as TextBox;
        // ...
    }
}

您可以通过注册文本框的名称来使原始点击处理程序正常工作：

someStackPanel.RegisterName(txtNumber.Name, txtNumber);

然后，这将允许您在StackPanel上调用FindName并找到TextBox。