WPF中如何动态创建一个文本框，并找到一个按钮，点击文本框？

问题描述

我动态创建一个文本框和按钮使用下列code：

I am creating a TextBox and a Button dynamically using the following code:

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);

我钩到click事件的点击我的按钮。点击我的按钮，即使是正确的解雇。不过，我无法找到文本框我动态输入。

I hook up to a click event to the Click Me button. The click me button even is fired correctly. However I cannot find the TextBox I entered dynamically.

下面是我点击我的事件：

Here is my click me event:

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");
    }
}

我如何找到文本框 txtNumber ？

推荐答案

乔希G的是修复了这个code线索：使用RegisterName（）

Josh G had the clue that fixed this code: use RegisterName().

三惠在这里：

1. 不使用一个成员变量来保存参照动态创建的文本框。
2. 编译。

3. 完成code。

1. Doesn't use a member variable to save the reference to the dynamically created TextBox.
2. Compiles.

3. Complete code.

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);
        }
    }
}

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