WPF自定义控件不可见 [英] WPF Custom Controls Are Invisible

问题描述

当我在WPF中创建自定义控件并将其添加到窗口时，在对话框中没有看到任何放置位置。这是我正在做的事情：

When I create a custom control in WPF and add it to a window, I don't see anything where I placed it in the dialog. Here's what I'm doing:

1. 创建新的WPF应用程序


2. 添加->新项目...->自定义控件（WPF）： CustomButton.cs


3. 我将CustomButton基类更改为Button而不是Control


4. 添加


5. 当我运行应用程序或在设计器中查看主窗口时，什么都看不到。

1. Create a new WPF Application
2. Add -> New Item... -> Custom Control (WPF): "CustomButton.cs"
3. I change the CustomButton base class to Button instead of Control
4. Add a CustomButton control to my main window.
5. When I run the application or view the main window in the designer, I don't see anything.

这是代码的样子。

CustomButton.cs：

CustomButton.cs:

public class CustomButton : Button
{
    static CustomButton()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomButton),
            new FrameworkPropertyMetadata(typeof(CustomButton)));
    }
}

MainWindow.xaml：

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" xmlns:my="clr-namespace:WpfApplication1">
    <Grid>
        <my:CustomButton Content="Hello World" x:Name="customButton1"
                         HorizontalAlignment="Left" VerticalAlignment="Top" Margin="150,175,0,0" />
    </Grid>
</Window>

Generic.xaml：

Generic.xaml:

<Style TargetType="{x:Type local:CustomButton}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type local:CustomButton}">
                <Border Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">
                </Border>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

我发现了发生情况的两条线索，但没有任何点击。当我添加自定义控件时，Visual Studio添加了Themes / Generic.xaml，但是无论我在其中尝试什么，在屏幕上都看不到任何区别。另一件事是，如果我在CustomButton.cs中注释掉了静态构造函数，该按钮会突然显示在主窗口中。但是，在所有情况下它看起来都不是很正确（例如，如果我使用工具栏中的按钮）。

I've found two leads as to what's going on, but nothing has clicked yet. When I added the custom control, Visual Studio added Themes/Generic.xaml, but no matter what I try in there, I see no difference on screen. The other thing is that if I comment out the static constructor in CustomButton.cs, all of a sudden the button show up in the main window. It doesn't look quite right in all situations, though (like if I use the button in a toolbar).

推荐答案

是您的自定义控件模板？

Where is your custom control template?

说

      DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomButton),
        new FrameworkPropertyMetadata(typeof(CustomButton)));

您表示要定义自己的自定义控件。我认为，如果删除该按钮，则会看到您的按钮。

you're indicating you want to defined your own custom control. I think if you remove that, you'll see your button.

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