可以的MyUserControl不会是因为它是使用XAML定义的XAML文件的根 [英] MyUserControl cannot be the root of a XAML file because it was defined using XAML

问题描述

可能重复：结果
  从一个WPF用户控件继承

我试图创建一个WPF用户控件，它是从其它用户的控制，这也是我所定义的。

I'm trying to create a WPF user control, which is derived from an other user control, which I also have defined.

<myNamespace:NavigationControl
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:myNamespace="clr-namespace:myNamespace" mc:Ignorable="d"
x:Class="myNamespace.WelcomeScreen"
x:Name="UserControl"
d:DesignWidth="640" d:DesignHeight="480">

和这里的WelcomeScreen.cs样子：

and here's what WelcomeScreen.cs looks like:

public partial class WelcomeScreen : NavigationControl
{
    public WelcomeScreen()
    {
        this.InitializeComponent();
    }
}

当我编译，我得到以下错误：

When I compile this, I get following error:

myNamespace.NavigationControl'不能是因为它使用XAML定义的XAML文件的根。

'myNamespace.NavigationControl' cannot be the root of a XAML file because it was defined using XAML.

我在做什么错了？

推荐答案

您是不是要做到这一点，错误告诉你。

You are not meant to do that and the error tells you that.

此外，使用XAML将内容，如果你在你的派生控件重新设置它，你会失去你之前定义的一切。如果你想继承和重用使用自定义的控制（并创建一个相应的控件模板）。

Besides, using XAML you set the Content, if you set it again in your derived control you would lose everything you defined before. If you want inheritance and reusability use a custom control (and create a respective ControlTemplate).

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