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Implementation Failure of a Transparent Window in WPF - c#

I found the implementation of WPF transparent window WITH BORDERS here C# WPF transparent window with a border. I tried implementing it, but my window is not transparent. No errors come out. Below are the xaml and code behind.
<Window x:Class="WpfApplication9.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Extended Glass in WPF" Height="300" Width="400"
Background="Transparent" Loaded="Window_Loaded">
<Grid ShowGridLines="True" Background="Transparent">
</Grid>
</Window>
Code behind
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Runtime.InteropServices;
using System.Drawing;
namespace WpfApplication9
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Window_Loaded(object sender, RoutedEventArgs e)
{
var transparancyConverter = new TransparancyConverter(this);
transparancyConverter.MakeTransparent();
}
[StructLayout(LayoutKind.Sequential)]
public struct MARGINS
{
public int cxLeftWidth; // width of left border that retains its size
public int cxRightWidth; // width of right border that retains its size
public int cyTopHeight; // height of top border that retains its size
public int cyBottomHeight; // height of bottom border that retains its size
};
[DllImport("DwmApi.dll")]
public static extern int DwmExtendFrameIntoClientArea(
IntPtr hwnd,
ref MARGINS pMarInset);
}
class TransparancyConverter
{
private readonly Window _window;
public TransparancyConverter(Window window)
{
_window = window;
}
public void MakeTransparent()
{
var mainWindowPtr = new WindowInteropHelper(_window).Handle;
var mainWindowSrc = HwndSource.FromHwnd(mainWindowPtr);
if (mainWindowSrc != null)
if (mainWindowSrc.CompositionTarget != null)
mainWindowSrc.CompositionTarget.BackgroundColor = System.Windows.Media.Color.FromArgb(0, 0, 0, 0);
var margins = new Margins
{
cxLeftWidth = 0,
cxRightWidth = Convert.ToInt32(_window.Width) * Convert.ToInt32(_window.Width),
cyTopHeight = 0,
cyBottomHeight = Convert.ToInt32(_window.Height) * Convert.ToInt32(_window.Height)
};
if (mainWindowSrc != null) DwmExtendFrameIntoClientArea(mainWindowSrc.Handle, ref margins);
}
[StructLayout(LayoutKind.Sequential)]
public struct Margins
{
public int cxLeftWidth;
public int cxRightWidth;
public int cyTopHeight;
public int cyBottomHeight;
}
[DllImport("DwmApi.dll")]
public static extern int DwmExtendFrameIntoClientArea(IntPtr hwnd, ref Margins pMarInset);
}
}
In addition, I have tried setting basic transparency in the code behind WITHOUT keeping the border. One will also find my xaml and code behind for this below. The created window is not transparent and just has a white background. What am I doing wrong in both of these examples? I feel like there is a common thread.
<Window x:Class="WpfApplication10.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
x:Name="MainWindowGUI"
>
<Grid>
</Grid>
</Window>
Code Behind
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApplication10
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.Loaded += MainView_Loaded;
}
void MainView_Loaded(object sender, RoutedEventArgs e)
{
Window yourParentWindow = Window.GetWindow(MainWindowGUI);
yourParentWindow.WindowStyle = WindowStyle.None;
yourParentWindow.AllowsTransparency = true;
SolidColorBrush Transparent = new SolidColorBrush(System.Windows.Media.Colors.Transparent);
yourParentWindow.Background = Transparent;
}
}
}

You need to set AllowsTransparency="True"; for that to work, you're required to set WindowStyle="None". WindowStyle="None" will lose you your non-client area (borders, titlebar, min/max/close buttons), but that's easy enough to work around.
<Window x:Class="WpfApplication9.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Extended Glass in WPF" Height="300" Width="400"
Background="Transparent"
AllowsTransparency="True"
WindowStyle="None"
>
<Grid ShowGridLines="True" Background="Transparent">
</Grid>
</Window>

Related

I have a class that has several properties, one of which is editable, another of which is calculated based on the editable value. I want to initialize the editable value with something and allow the user to change it however they wish. However, I also want to have a reset button that puts the original value back into the textbox. I have a third variable that stores the value of the original number. However, I am not sure how I am supposed to access the object when the reset button is clicked to put the value back into the textbox. I've put the relevant code below (if I shouldn't be posting everything please let me know, still new to stackoverflow how-to):
Main Window
C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using HDR_BED_Calc_local.Testers;
using HDR_BED_Calc_local.Helpers;
namespace HDR_BED_Calc_local
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
//var window = new MainWindow();
this.DataContext = new fraction_doses(800, 700, 900, 800, 900, 1, 3);
}
}
}
XAML
<Window x:Class="HDR_BED_Calc_local.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:HDR_BED_Calc_local"
xmlns:uctesters="clr-namespace:HDR_BED_Calc_local.Testers"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<uctesters:fx_tester x:Name="fxtester_UC"/>
</Grid>
</Window>
Custom user control
C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using HDR_BED_Calc_local.Helpers;
namespace HDR_BED_Calc_local.Testers
{
/// <summary>
/// Interaction logic for fx_tester.xaml
/// </summary>
public partial class fx_tester : UserControl
{
public fx_tester()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
// What do I put here??
}
}
}
XAML
<UserControl x:Class="HDR_BED_Calc_local.Testers.fx_tester"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:HDR_BED_Calc_local.Testers"
mc:Ignorable="d"
d:DesignHeight="450" d:DesignWidth="800" Background="White">
<StackPanel HorizontalAlignment="Center">
<StackPanel Orientation="Horizontal">
<TextBlock xml:space="preserve">Fraction: </TextBlock>
<TextBlock Text="{Binding Path=fraction_number}"></TextBlock>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock xml:space="preserve">Current Dose: </TextBlock>
<TextBox x:Name="curr_fx_tb" Text="{Binding Path=editable_fraction_dose, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"></TextBox>
</StackPanel>
<StackPanel Orientation="Horizontal">
<TextBlock xml:space="preserve">EQD2: </TextBlock>
<TextBlock Text="{Binding Path=this_fx_brachy_EQD2, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
</StackPanel>
<Button Content="Reset" Click="Button_Click"/>
</StackPanel>
</UserControl>
Helper function with class
C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace HDR_BED_Calc_local.Helpers
{
internal class fraction_doses : INotifyPropertyChanged
{
public int fraction_number { get; set; }
public double alpha_beta { get; }
private double _editable_fraction_dose;
public double editable_fraction_dose
{
get { return _editable_fraction_dose; }
set
{
_editable_fraction_dose = value;
calc_EQD2();
this.OnPropertyChanged("editable_fraction_dose");
}
}
public double actual_fraction_dose { get; }
public double pear_plan_dose { get; }
public double IMRT_plan_dose { get; }
public double max_dose_limit { get; }
public double preferred_dose_limit { get; }
private double _this_fx_brachy_EQD2;
public double this_fx_brachy_EQD2
{
get { return this._this_fx_brachy_EQD2; }
set
{
this._this_fx_brachy_EQD2 = value;
this.OnPropertyChanged("this_fx_brachy_EQD2");
}
}
public event PropertyChangedEventHandler PropertyChanged;
public fraction_doses(double current_dose, double pear_dose, double IMRT_dose, double max_dose_limit, double preferred_dose_limit, int fraction_number, int alpha_beta)
{
this.alpha_beta = alpha_beta;
this.actual_fraction_dose = current_dose;
this.editable_fraction_dose = current_dose;
this.pear_plan_dose = pear_dose;
this.IMRT_plan_dose = IMRT_dose;
this.max_dose_limit = max_dose_limit;
this.preferred_dose_limit = preferred_dose_limit;
this.fraction_number = fraction_number;
}
public void calc_EQD2()
{
// EQD2 is always reported in Gray even though we will be reporting cGy
double dose_Gy = this.editable_fraction_dose/100;
this.this_fx_brachy_EQD2 = Math.Round(1 * dose_Gy * (1+ dose_Gy / alpha_beta)/(1+2/alpha_beta), 2);
}
public void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
if (PropertyChanged != null)
{
this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}

You can try the following:
private void Button_Click(object sender, RoutedEventArgs e)
{
// What do I put here??
var dc = (fraction_doses ) this.DataContext:
if(dc!=null)
dc.Clear();
}
in your fraction_doses class add the method that clears the properties
public void Clear(){
this.MyProperty = MY_DEFAULT_VALUE;
//clear other properties..
}

I have made a list that is a property amnd then given that list values and this is still not working to place in a listview as a itemsource i have no idea how to fix this and get results is there anyone that can show me what im doing wrong here? i am placing the data context in the MainWindow
XAML
<Window x:Class="CRM.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:CRM"
mc:Ignorable="d"
Title="MainWindow" Height="1080" Width="1920">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition Width="0*"/>
</Grid.ColumnDefinitions>
<ListView ItemsSource="{Binding tickets}" Margin="0,10,1075,0" MaxWidth="990"/>
</Grid>
</Window>
MainViewModel:
using API.Objects;
using API.ViewModels;
using System;
using System.Collections.Generic;
using System.Text;
namespace API.ViewModels
{
public class MainViewModel : BaseViewModel
{
int Counter{ get; set; }
List<TicketO> tickets { get; set;}
public MainViewModel()
{
TicketO ticket = new TicketO("Jens", "Svensson", "jenson1234#live.se", "0767942768", "This is working but my box is not", 500);
tickets.Add(ticket);
}
}
}
MainWindow
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using API.ViewModels;
namespace CRM
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.DataContext = new MainViewModel();
}
}
}

Make tickets public, DataContext = this; is missing, refer below link.
How can I bind a List as ItemSource to ListView in XAML?

i'm trying to learn WPF and on top of that the MVVM style of doing things.
I have a simple practice app in which i would like to display codes in a combo box.
My Code
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace SteamCodes
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
private ObservableCollection<Codes> codes;
public MainWindow()
{
InitializeComponent();
codes = new ObservableCollection<Codes>()
{
new Codes() {CodeID = "1", Code="CODETEXT"}
};
steamCode.ItemsSource = codes.ToString();
}
}
public class Codes
{
public string CodeID { get; set; }
public string Code { get; set; }
}
}
My XAML
<Window x:Class="SteamCodes.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:SteamCodes"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<Grid>
<ComboBox x:Name="steamCode" ItemsSource="{Binding Source = Codes}" HorizontalAlignment="Left" Height="43" Margin="122,37,0,0" VerticalAlignment="Top" Width="259"/>
</Grid>
</Window>
At the moment my Combo box is Pulling through as each option in the ComboBox is a letter from the line 'System.Collections.Objectmodel.ObservableCollection`1[SteamCodes.Codes]'
Everyone of those letters is a different drop down option in the combo box.
Any Ideas where i have gone wrong.

Your ComboBox ItemSource must be a collection of items, not a string:
steamCode.ItemsSource = codes;
You also have to specify which property of your item must be considered as value to be shown in combobox by setting DisplayMemberPath property:
steamCode.DisplayMemberPath = "Code";
To specify which property of bound objects will be used as actual selected value you have to use SelectedValuePath property:
steamCode.SelectedValuePath = "CodeID";
The MVVM approach is this:
public class ViewModel
{
public ObservableCollection<Codes> Codes { get; }
= new ObservableCollection<Codes>();
}
The MainWindow constructor:
public MainWindow()
{
InitializeComponent();
var viewModel = new ViewModel();
viewModel.Codes.Add(new Codes { CodeID = "1", Code = "CODETEXT" });
DataContext = viewModel;
}
The XAML:
<ComboBox ItemsSource="{Binding Codes}" DisplayMemberPath="Code" .../>

This question already has answers here:
Passing parameters between viewmodels
(2 answers)
Closed 8 years ago.
Goal:
When you click one of the rows in the lstView_bbb (in Test.xaml), the return value shall be return to the class MainWindow (MainWindow.xaml). And then, the Test.xaml shall be closed.
Problem:
I tried finding a solution that data of "_a" from row shall be transferred to the MainWIndow but it didn't go so well due to performance issue. I want to make it more efficient.
Information:
*I'm using WPF with VS 2013
*The return value is "_a" to the class MainWIndow.xaml
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Button x:Name="btn_test" Content="Test" HorizontalAlignment="Left" Margin="348,240,0,0" VerticalAlignment="Top" Width="75" Click="btn_test_Click"/>
</Grid>
</Window>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private List<aaa> _myList_aaa;
private void btn_test_Click(object sender, RoutedEventArgs e)
{
_myList_aaa = new List<aaa>();
for (int a = 1; a <= 5; a++)
{
aaa myaaa = new aaa();
myaaa._a = a;
myaaa._city = "New Yor";
myaaa._name = "jj jj jj";
_myList_aaa.Add(myaaa);
}
Test myTest = new Test(_myList_aaa);
myTest.ShowDialog();
}
}
public class aaa
{
public int _a { get; set; }
public string _name { get; set; }
public string _city { get; set; }
}
}
---------------------------------------
<Window x:Class="WpfApplication1.Test"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Test" Height="300" Width="300">
<Grid Background="#FFE5E5E5">
<ListView x:Name="lstView_bbb" SelectionMode="Single" ItemsSource="{Binding}" HorizontalAlignment="Left" Height="111" Margin="35,67,0,0" VerticalAlignment="Top" Width="222">
<ListView.View>
<GridView>
<GridViewColumn Header="name" Width="auto" DisplayMemberBinding="{Binding Path=_name}" TextBlock.TextAlignment="Left" />
<GridViewColumn Header="city" Width="auto" DisplayMemberBinding="{Binding Path=_city}" TextBlock.TextAlignment="Center" />
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for Test.xaml
/// </summary>
public partial class Test : Window
{
public Test(IList<aaa> pAAA)
{
InitializeComponent();
lstView_bbb.DataContext = pAAA;
}
}
}

The easiest way is to create a property in Test:
class Test
{
public aaa SelectedItem
{
get
{
return lstView_bbb.SelectedItems[0] as aaa;
}
}
The best way is to use a ViewModel. Assign it to Test and use the same ViewModel in you other form to get the selected value.
Read the related MSDN article.

I was wondering is it possible to create a panel-like control in wpf, and another wpf custom control that will be the child of this panel, all in WinForms application. And then, would it be possible to set the custom control's size in float?
Also would I be able to rotate that custom control?
Thanks in advance

You will need to use the System.Windows.Forms.Integration NameSpace, more specifically the ElementHost Control, that will allow you to embed a WPF Control in Winforms.
This is a quick and simple demonstration of changing the WPF UserControls Child UserControls Size and Location. I will leave the animation to you.
Main Winform Form
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.Integration;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
ElementHost host;
WpfControlLibrary1.UserControl1 uc;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
host = new ElementHost();
host.Dock = DockStyle.Top;
uc = new WpfControlLibrary1.UserControl1();
host.Child = uc;
this.Controls.Add(host);
}
private void button1_Click(object sender, EventArgs e)
{
uc.SetChildLocation = new System.Windows.Point(uc.SetChildLocation.X + 25.5, uc.SetChildLocation.Y + 10.2);
}
private void button2_Click(object sender, EventArgs e)
{
uc.SetChildSize = new System.Windows.Size(uc.SetChildSize.Width + .25, uc.SetChildSize.Height + .25);
}
}
}
UserControl1.xaml
<UserControl x:Class="WpfControlLibrary1.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300" Background="Red" xmlns:my="clr-namespace:WpfControlLibrary1">
<Canvas>
<my:UserControl2 HorizontalAlignment="Center" x:Name="userControl21" VerticalAlignment="Center" Canvas.Left="0" Canvas.Top="0" />
</Canvas>
</UserControl>
UserControl1.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfControlLibrary1
{
/// <summary>
/// Interaction logic for UserControl1.xaml
/// </summary>
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent();
}
public Point SetChildLocation
{
get
{
return new Point(Canvas.GetLeft(userControl21), Canvas.GetTop(userControl21));
}
set
{
Canvas.SetLeft(userControl21, value.X);
Canvas.SetTop(userControl21, value.Y);
}
}
public Size SetChildSize
{
get
{
return new Size(userControl21.ActualWidth, userControl21.ActualHeight);
}
set
{
userControl21.Width = value.Width;
userControl21.Height = value.Height;
}
}
}
}
UserControl2.xaml
<UserControl x:Class="WpfControlLibrary1.UserControl2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d"
d:DesignHeight="300" d:DesignWidth="300" SizeChanged="UserControl_SizeChanged">
<Grid>
<Rectangle x:Name="rect" Fill="Blue" Height="40" Width="120"></Rectangle>
</Grid>
</UserControl>
UserControl2.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfControlLibrary1
{
/// <summary>
/// Interaction logic for UserControl2.xaml
/// </summary>
public partial class UserControl2 : UserControl
{
public UserControl2()
{
InitializeComponent();
}
private void UserControl_SizeChanged(object sender, SizeChangedEventArgs e)
{
rect.Width = e.NewSize.Width;
rect.Height = e.NewSize.Height;
}
}
}