Question

我对VB或C＃的回答很好，我知道两者，终极解决方案将用VB.Net编写。基本上我想使用一个模板在n个排列中重用基础的依赖属性，但是我在路径后面的代码中放弃了一个xaml并放弃了一个Style模板。基本上我想在用户控件中做这样的事情，我想用于基础：

XAML：

<UserControl x:Class="Test"
             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:WPFControls"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid Name="PART_TestLayout">
    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"/>
      <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <TextBlock Text="{Binding TestTitle}" Height="30" Background="White" Foreground="Black" />
    <TextBlock Name="PART_Text2" Grid.Row="1" Background="White" />
  </Grid>
</UserControl>

XAML背后的代码：

Imports System.ComponentModel

Public Class Test


  Public Sub New()
    InitializeComponent()
    PART_TestLayout.DataContext = Me
  End Sub

  Public Shared ReadOnly TestTitleProperty As DependencyProperty = DependencyProperty.Register("TestTitle", GetType(String), GetType(Test), New UIPropertyMetadata(String.Empty, AddressOf TestChanged))

  Public Property TestTitle As String
    Get
      Return CType(GetValue(TestTitleProperty), String)
    End Get
    Set
      SetValue(TestTitleProperty, Value)
    End Set
  End Property

  Private Shared Sub TestChanged(d As DependencyObject, e As DependencyPropertyChangedEventArgs)
    Dim m = DirectCast(d, Test)
    m.PART_Text2.Text = $"Changed {DateTime.Now.ToLongTimeString}"
  End Sub
  Public MustOverride Sub DoThing()
End Class

我想做的是这样的事情：

USE1：

<local:Test x:Class="TestInheritance"
             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:WPFControls"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
    <Label Content="I am the first implentation"/>
    <local:Test TestTitle="{Binding TestText}" />
  </Grid>
</local:Test>

USE2

<local:Test x:Class="TestInheritance2"
             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:WPFControls"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
    <Label Content="I am the second implentation"/>
    <local:Test TestTitle="{Binding TestText}" />
  </Grid>
</local:Test>

现在我知道我可以做这样的事情（可能就是我应该去的方式）

<UserControl x:Class="TestInheritance"
             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:WPFControls"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
    <local:Part1 TestTitle="{Binding TestText}" />
    <!-- myproprietaryContent -->
    <local:Part2 TestLegend="{Binding TestText2}" />
  </Grid>
</local:Test>

但我宁愿继承基础模板，只需应用我需要的一切。 我是否需要使用样式模板来执行此操作，还是可以按原样重复使用XAML UserControl？每次我尝试继承（baseclassname）＆＃39;在后面的代码我得到这个错误：

'Base class 'Test' specified for class 'TestInheritance' cannot be different from the base class 'UserControl' of one of its other partial types.'

所以我有点不知所措，对WPF的语言和功能了解不足，可以做到这一点，或者应该做到这一点。

Answer 1

您无法重复使用基础UserControl的内容，因为内容将被派生控件覆盖。基类应该只定义依赖项属性，并且没有任何XAML标记。

请参阅以下示例代码：

Test.vb（基类）：

Public MustInherit Class Test
    Inherits UserControl

    Public Shared ReadOnly TestTitleProperty As DependencyProperty = DependencyProperty.Register("TestTitle", GetType(String), GetType(Test), New UIPropertyMetadata(String.Empty, AddressOf TestChanged))

    Public Property TestTitle As String
        Get
            Return CType(GetValue(TestTitleProperty), String)
        End Get
        Set
            SetValue(TestTitleProperty, Value)
        End Set
    End Property

    Private Shared Sub TestChanged(d As DependencyObject, e As DependencyPropertyChangedEventArgs)
        '...
    End Sub
    Public MustOverride Sub DoThing()
End Class

<强> UserControl1.xaml：

<local:Test x:Class="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" 
             xmlns:local="clr-namespace:WpfApplicationVb1"
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>

    </Grid>
</local:Test>

<强> UserControl1.xaml.vb：

Public Class UserControl1
    Inherits Test

    Public Overrides Sub DoThing()
        '...
    End Sub
End Class

Answer 2

UserControls用于构图。如果你想要合理的继承，你应该使用自定义控件。

http://wpftutorial.net/HowToCreateACustomControl.html

在您的情况下，我将从TextBlock继承并向其添加BottomText依赖项属性。然后在Generic.xaml中对其进行样式处理，就像你所做的那样。

另请参阅此处了解UserControls和自定义控件之间的区别（后一种模式是为您的用例构建的）：http://wpftutorial.net/CustomVsUserControl.html

如何从基础WPF用户控件继承从属属性到继承的新用户控件？

2 个答案: