XAML Controls inside Custom Class

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I created simple project "WpfApplication1" and inserted Canvas "myCanvas" into XAML and I tried to use "myCanvas" inside that class "TestClass" but couldn't, Please help me...

how I can call "myCanvas" inside "TestClass"?

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace WpfApplication1
{
    class TestClass
    {
    }
}

XML

<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>
        <Canvas Name="myCanvas" HorizontalAlignment="Left" Height="137" Margin="122,90,0,0" VerticalAlignment="Top" Width="277" Background="Green"/>
    </Grid>
</Window>

C#

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 WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}

Posted 6-Jun-13 0:51am

suro_sh

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suro_sh · Answer 1 · 2013-06-07T03:23:00

Solution 3

Thanks all but I write this staff.

We need constructor

C#

public TestClass(Mainwindow window)
{
   window.myCanvas.Background = Brushes.Red;
}

And write on MainWindow

C#

var obj = TestClass(this);

And All is Done.

Posted 7-Jun-13 3:23am

suro_sh

Sunasara Imdadhusen · Answer 2 · 2013-06-06T02:18:00

Hello,

you can not directly access your canvas object in other class you have to create public property inside the MainWindow.

C#

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }

//here you can set any property value of your canvas. this is sample demonstrate code how to access not complete running example anymore.
    public Control myCanvas { get; set;}
}

koleraba · Answer 3 · 2013-06-06T17:13:00

You need a reference to your MainWindow. You can get the reference through Application.Current.MainWindow. All you have to do is cast it to MainWindow type:

C#

var canvas = ((MainWindow)Application.Current.MainWindow).Get_Canvas;

However I don't think that accesing controls from another type is a good idea. You should reconsider why you need a reference to 'myCanvas' from another type. There is a reason why objects instantiated in xaml are private.

Hope that helps.
Uros

XAML Controls inside Custom Class

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