C# 依赖项属性未更新Visual Studio Designer
我已经为一个新的WPF窗口类创建了一个样式,并且在其中有一些依赖属性。需要注意的是 显示帮助按钮 这将切换窗口上“帮助”按钮的可见性。代码在运行时运行良好,但我无法让它在设计视图中更新UI 下面是课程:C# 依赖项属性未更新Visual Studio Designer,c#,wpf,visual-studio-2015,dependency-properties,C#,Wpf,Visual Studio 2015,Dependency Properties,我已经为一个新的WPF窗口类创建了一个样式,并且在其中有一些依赖属性。需要注意的是 显示帮助按钮 这将切换窗口上“帮助”按钮的可见性。代码在运行时运行良好,但我无法让它在设计视图中更新UI 下面是课程: public class MainWindowFrame : Window { #region DependencyProperties public static readonly DependencyProperty ShowHelpButtonProperty = Depende
public class MainWindowFrame : Window
{
#region DependencyProperties
public static readonly DependencyProperty ShowHelpButtonProperty = DependencyProperty.Register(
"ShowHelpButton", typeof (bool), typeof (MainWindowFrame), new FrameworkPropertyMetadata(true, FrameworkPropertyMetadataOptions.AffectsRender));
public bool ShowHelpButton
{
get { return (bool) GetValue(ShowHelpButtonProperty); }
set { SetValue(ShowHelpButtonProperty, value); }
}
#endregion
static MainWindowFrame()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(MainWindowFrame),
new FrameworkPropertyMetadata(typeof(MainWindowFrame)));
}
风格如下:
<Style x:Key="MainWindowStyle" TargetType="{x:Type abstractClasses:MainWindowFrame}">
<Setter Property="HorizontalAlignment" Value="Stretch" />
<Setter Property="VerticalAlignment" Value="Stretch" />
<Setter Property="AllowsTransparency" Value="True" />
<Setter Property="Background" Value="{StaticResource LightBlueBrush}" />
<Setter Property="BorderBrush" Value="{StaticResource BlueBrush}" />
<Setter Property="BorderThickness" Value="1" />
<Setter Property="CornerRadius" Value="1" />
<Setter Property="ResizeMode" Value="NoResize" />
<Setter Property="WindowStyle" Value="None" />
<Setter Property="Title" Value="New Window" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type abstractClasses:MainWindowFrame}">
<Border
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
CornerRadius="{TemplateBinding CornerRadius}">
<Grid x:Name="ContainerGrid" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Grid.Triggers>
<EventTrigger RoutedEvent="Grid.Loaded">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetProperty="Opacity"
From="0"
To="1"
Duration="00:00:01" />
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Grid.Triggers>
<Grid Background="Transparent" MouseDown="Window_MouseDownDrag">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid Grid.Column="0">
<TextBlock
Margin="10,3,0,3"
HorizontalAlignment="Left"
VerticalAlignment="Center"
Style="{StaticResource CustomTitleBarTextBlackB}"
Text="{TemplateBinding Title}" />
</Grid>
<Button
Grid.Column="1"
Width="20"
Height="20"
Margin="0,0,5,0"
HorizontalAlignment="Right"
AutomationProperties.AutomationId="Help"
Style="{StaticResource HelpButtonStyle}"
Visibility="{TemplateBinding Property=ShowHelpButton,
Converter={StaticResource BoolToVisConverter}}" />
</Grid>
<AdornerDecorator Grid.Row="1">
<ContentPresenter x:Name="WindowContent" />
</AdornerDecorator>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
我还添加了一个回调,但没有用。我甚至尝试重新启动Visual Studio 2015。我开始认为这只是一个VS错误,但我希望有人知道发生了什么。谢谢你的帮助 对不起,我无法重现您的问题 我通常用一种更简单但仍然复杂的方式。我将ViewModel放在另一个程序集中,因此我不会从view中引用它为了使所有内容都可设置样式,我将模板放入Generic.xaml中,并覆盖另一个字典中的样式,该字典在App.xaml中的Generic之后加载 这是我做事的方式 MyWindow.xaml:
<Window x:Class="Sandbox.MyWindow"
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:local="clr-namespace:Sandbox"
xmlns:l="clr-namespace:ProjectLibrary;assembly=ProjectLibrary"
mc:Ignorable="d" d:DataContext="{DynamicResource DesignViewModel}"
Title="MyWindow" Height="300" Width="300">
<Window.Resources>
<l:MyViewModel x:Key="DesignViewModel" SomeButtonVisibility="Collapsed"/>
</Window.Resources>
<StackPanel>
<TextBlock Text="{Binding SomeText}"/>
<Button HorizontalAlignment="Center" VerticalAlignment="Center" Content="1 Button"/>
<Button Visibility="{Binding SomeButtonVisibility}" HorizontalAlignment="Center" VerticalAlignment="Center" Content="2 Button"/>
<Button HorizontalAlignment="Center" VerticalAlignment="Center" Content="3 Button"/>
</StackPanel>
MyViewModel:
using System.Windows;
namespace ProjectLibrary
{
public class MyViewModel : Notifiable
{
public MyViewModel() :this(false) {
}
public MyViewModel(bool Execute) {
if (Execute) {
SomeText = "Execution data";
} else {
SomeText = "Design Data";
}
SomeButtonVisibility = Visibility.Visible;
}
private string _someText;
public string SomeText { get { return _someText; } set { _someText = value; RaisePropertyChanged("SomeText"); } }
private Visibility _someButtonVisibility;
public Visibility SomeButtonVisibility { get { return _someButtonVisibility; } set { _someButtonVisibility = value; RaisePropertyChanged("SomeButtonVisibility"); } }
}
}
Notifiable.cs:
using System.ComponentModel;
namespace PTR.PTRLib.Common {
public class Notifiable : INotifyPropertyChanged {
public event PropertyChangedEventHandler PropertyChanged;
protected void RaisePropertyChanged(string propertyName) {
// take a copy to prevent thread issues
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) {
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
App.xaml:
<Application x:Class="Sandbox.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Sandbox">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Themes/Generic.xaml"/> <!-- Default Styles -->
<ResourceDictionary Source="Themes/StyleRes.xaml"/> <!-- ColorTemplates -->
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Application.Resources>
模板/Generic.xaml:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Sandbox">
<Style TargetType="{x:Type local:MyWindow}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Grid>
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}">
<AdornerDecorator>
<ContentPresenter/>
</AdornerDecorator>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="ResizeMode" Value="CanResizeWithGrip">
<Setter Property="Template" Value="{StaticResource WindowTemplateKey}"/>
</Trigger>
</Style.Triggers>
</Style>
Themes/StyleRes.xaml:
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Sandbox">
<Style TargetType="{x:Type local:MyWindow}">
<Setter Property="Foreground" Value="Red"/>
<Setter Property="Background" Value="LightBlue"/>
</Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Foreground" Value="Red"/>
<Setter Property="Background" Value="LightBlue"/>
</Style>
我不是WPF方面的专业人士,但这是我在1.5年的数据库+WPF接口编程课程(不错的一个)中学到的。我知道这可能是一个简短的答案。。。。但是我认为这个问题,因为它只是在设计时出现的,可能是由于设计器中的数据上下文问题。你试过d:DataContext吗
d:DataContext ="{d:DesignInstance {x:Type nameSpace:ViewModel}, IsDesignTimeCreatable=True}"
更新答案 它看起来像是一个已知的设计时错误;对于子类/派生窗口对象 此报告的错误似乎与此问题有关: 我们无法在设计器中创建Window的设计实例,因此我们使用自己的代理类型进行替换 因此,如果设计器无法创建派生窗口类型的实例;绑定(TemplateBinding)逻辑将在设计时失败
由于向TemplateBinding提供回退值并不容易,所以您可以使用它来提供默认值,作为设计时行为 这与DataContext无关。TemplateBinding就是为了这个目的。只是再次检查了你的代码;我错过了模板绑定。我会更新我的答案。这就是我的想法(并且害怕哈哈)。感谢您确认这是一个VS错误。我希望这不是一条评论所暗示的设计意图。也许有一天它会被修复。试着用controltemplate中的触发器代替templatebinding,看看它是否有助于。。。正如Sharada Gururaj所说,这是一个已知的bug。现在我记得我以前处理过类似的事情,但没有找到解决办法。所以我开始在用户控件中做所有的事情,但现在我意识到你可以用我的模式轻松地做自定义控件。您可以将每个控件原型化为UserControl,然后复制/粘贴并创建CustomControl。以后制作模板和重用控件将很容易。谢谢您的回复!这可能是一种解决方法,但唯一的问题是,设计MyWindow的所有代码都必须在.cs文件中完成,因为我希望在另一个包含xaml代码的类中继承MyWindow(不允许继承在另一个xaml文件中使用xaml定义的类)。我真的不想在cs文件中创建所有UI代码。
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Sandbox">
<Style TargetType="{x:Type local:MyWindow}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Window}">
<Grid>
<Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}">
<AdornerDecorator>
<ContentPresenter/>
</AdornerDecorator>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="ResizeMode" Value="CanResizeWithGrip">
<Setter Property="Template" Value="{StaticResource WindowTemplateKey}"/>
</Trigger>
</Style.Triggers>
</Style>
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Sandbox">
<Style TargetType="{x:Type local:MyWindow}">
<Setter Property="Foreground" Value="Red"/>
<Setter Property="Background" Value="LightBlue"/>
</Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Foreground" Value="Red"/>
<Setter Property="Background" Value="LightBlue"/>
</Style>
d:DataContext ="{d:DesignInstance {x:Type nameSpace:ViewModel}, IsDesignTimeCreatable=True}"