基于视图模型属性的条件控件模板

Question

是否可以根据视图模型的属性"选择"不同的控件模板？

我有以下用户控件模板：

<UserControl.Template>
<ControlTemplate TargetType="UserControl">
<RadioButton 
GroupName="DisplayButtons" 
Content="{TemplateBinding Content}"/>
</ControlTemplate>
</UserControl.Template>

基于视图模型中的布尔值，我想使用RadioButton或Button。

我怎样才能做到这一点？

Answer 1

您可以使用带有DataTrigger的Style来设置Template属性：

<UserControl>
<UserControl.Style>
<Style TargetType="UserControl">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="UserControl">
<Button Content="Button" />
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<DataTrigger Binding="{Binding ViewModelProperty}" Value="True">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="UserControl">
<RadioButton Content="RadioButton" />
</ControlTemplate>
</Setter.Value>
</Setter>
</DataTrigger>
</Style.Triggers>
</Style>
</UserControl.Style>
</UserControl>

Answer 2

可以对每种情况使用不同的视图，但此方法在复杂模板的情况下更有用。 对于当前情况，最简单的方法是使用触发器：

方法 1

<UserControl x:Class="Myusercontrolnamespace.Views.Myusercontrol" 
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" "  
mc:Ignorable = "d" Height="auto" Width="auto" >
<UserControl.Resources>
<DataTemplate x:Key="RadioButtontTemplate">
<RadioButton/>
</DataTemplate>
<DataTemplate x:Key="ButtonTemplate">
<Button/>
</DataTemplate>
</UserControl.Resources>
<Grid>
<ContentControl Content="{Binding }">
<ContentControl.Style>
<Style TargetType="{x:Type ContentControl}">
<Setter Property="ContentTemplate" Value="{StaticResource RadioButtontTemplate}" />
<Style.Triggers>
<DataTrigger Binding="{Binding IsRadioButton}" Value="False">
<Setter Property="ContentTemplate" Value="{StaticResource ButtonTemplate}" />
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</Grid>
</UserControl>

方法 2

<UserControl x:Class="Myusercontrolnamespace.Views.Myusercontrol" 
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" "  
mc:Ignorable = "d" Height="auto" Width="auto" >
<UserControl.Resources>
<DataTemplate x:Key="RadioButtontTemplate">
<RadioButton/>
</DataTemplate>
<DataTemplate x:Key="ButtonTemplate">
<Button/>
</DataTemplate>
</UserControl.Resources>
<Grid>
<DataTemplate x:Key="globalControlTemplate">
<ContentControl Content="{Binding }">
<ContentControl.Style>
<Style TargetType="{x:Type ContentControl}">
<Setter Property="ContentTemplate" Value="{StaticResource RadioButtontTemplate}" />
<Style.Triggers>
<DataTrigger Binding="{Binding ConsumerType}" Value="Business">
<Setter Property="ContentTemplate" Value="{StaticResource ButtonTemplate}" />
</DataTrigger>
</Style.Triggers>
</Style>
</ContentControl.Style>
</ContentControl>
</DataTemplate> 
<ContentControl Content="{Binding globalControlTemplate}" />
</Grid>
</UserControl>

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