Contains Element? : Panel « Windows Presentation Foundation « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Windows Presentation Foundation
3. Panel

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="ElemCollMethods.Pane1"
    WindowTitle="UI Element Collection Methods Sample">
 <StackPanel>
    <TextBlock Name="txt" FontSize="16">UI Element Collection - Methods</TextBlock>

    <TabControl>
        <TabItem MouseLeftButtonUp="ContainsElement">
            <TabItem.Header>Contains Element?</TabItem.Header>
        </TabItem>
    </TabControl>
    <StackPanel Name="sp1"></StackPanel>

 </StackPanel>
</Page>
//File:Window.xaml.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Data;
using System.Windows.Input;

namespace ElemCollMethods
{

  public partial class Pane1 : Page
  {
    System.Windows.Controls.Button btn, btn1, btn2, btn3;

        void ContainsElement(object sender, RoutedEventArgs e)
        {
            sp1.Children.Clear();
            btn = new Button();
      btn.Content = "Click to clear";
            sp1.Children.Add(btn);
            btn.Click += (ClearControls);
      btn1 = new Button();
      btn1.Content = "Click to clear";
            sp1.Children.Add(btn1);
            btn1.Click += (ClearControls);
      btn2 = new Button();
      btn2.Content = "Click to clear";
            sp1.Children.Add(btn2);
            btn2.Click += (ClearControls);
      btn3 = new Button();
      btn3.Content = "Click to clear";
            sp1.Children.Add(btn3);
            btn3.Click += (ClearControls);

            TextBlock txt1 = new TextBlock();
            sp1.Children.Add(txt1);
            txt1.Text = "This StackPanel contains UIElement btn1: " + sp1.Children.Contains(btn1).ToString();
        }
        
    void ClearControls(object sender, RoutedEventArgs e)
    {
            sp1.Children.Clear();
        }        
  }
}

24.55.Panel
	24.55.1.	Add a control to a Panel
	24.55.2.	Remove Control from a Panel
	24.55.3.	Insert Button to a Panel
	24.55.4.	Add child control
	24.55.5.	Show Index of Controls
	24.55.6.	Clear Controls
	24.55.7.	Contains Element?
	24.55.8.	UIElement Count
	24.55.9.	Get Item At Index Position [0]
	24.55.10.	Panel is setting the data context to the scrollbar object
	24.55.11.	Find the index number of a newly added element within a panel, using the IndexOf method
	24.55.12.	Insert to a Panel by index
	24.55.13.	Get all children from a Panel
	24.55.14.	Search for an element by using Panel.FindName()
	24.55.15.	Panel.ZIndex
	24.55.16.	Without Panel.ZIndex
	24.55.17.	Override the default layout behavior of the Panel element and create custom layout elements that are derived from Panel.