自定义类中的XAML控件 [英] XAML Controls inside Custom Class

问题描述

我创建了简单的项目WpfApplication1并将CanvasmyCanvas插入到XAML中，我试图在TestClass类中使用myCanvas但是不能，请帮助我......



如何在TestClass中调用myCanvas？

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"?

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

namespace WpfApplication1
{
    class TestClass
    {
    }
}

<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>

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();
        }
    }
}

推荐答案

感谢所有人，但我写了这个工作人员。



我们需要构造函数

Thanks all but I write this staff.

We need constructor

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

并写在MainWindow上

And write on MainWindow

var obj = TestClass(this);

All is Done。

And All is Done.

您好，



您无法直接访问其他类中的canvas对象，您必须在MainWindow中创建公共属性。

Hello,

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

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;}
}

您需要对MainWindow的引用。您可以通过Application.Current.MainWindow获取引用。您所要做的就是将其转换为MainWindow类型：

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:

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

但我不认为从其他类型访问控件是个好主意。你应该重新考虑为什么你需要从另一种类型引用'myCanvas'。在xaml中实例化的对象是私有的有一个原因。


希望有所帮助。

Uros

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

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