![](/img/trans.png)
[英]WPF ItemsControl element DataTrigger doesn`t fire after data changes
[英]WPF DataTrigger won't monitor changes
我創建了一個自定義UserControl。 它具有自定義的Dependency屬性。 樣式具有使用該屬性的數據觸發器。 加載表單時,ExpectsFunction.get()被調用兩次。 然后,我在外部將ExpectsFunction設置為true。 如果在設置器中放置一個斷點,則會看到SetValue被正確調用,並且屬性ExpectsFunction變為'true'。 但是,DataTrigger似乎對更改沒有反應。 我是否需要實現一些其他事件,或者實現INotifyPropertyChanged並從DependencyProperty的回調中手動觸發PropertyChanged? 我以為DataTrigger會訂閱DependencyProperty,但事實並非如此:/
public partial class MatlabScriptSettings : UserControl
{
public static readonly DependencyProperty ExpectsFunctionProperty =
DependencyProperty.Register("ExpectsFunctionProperty", typeof(bool), typeof(MatlabScriptSettings), new PropertyMetadata(false));
public bool ExpectsFunction
{
get
{
return (bool)GetValue(ExpectsFunctionProperty);
}
set
{
SetValue(ExpectsFunctionProperty, value);
}
}
}
<UserControl x:Class="PlatformManager.UI.Configuration.MatlabScriptSettings"
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"
d:DesignHeight="400" d:DesignWidth="350"
x:Name="_this">
<UserControl.Resources>
<Style x:Key="ArgumentsStyle" TargetType="{x:Type TextBox}">
<Style.Triggers>
<DataTrigger Binding="{Binding ElementName=_this, Path=ExpectsFunction}" Value="True">
<Setter Property="IsReadOnly" Value="False" />
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlLightLightBrushKey}}" />
</DataTrigger>
<DataTrigger Binding="{Binding ElementName=_this, Path=ExpectsFunction}" Value="False">
<Setter Property="IsReadOnly" Value="True" />
<Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlLightBrushKey}}" />
</DataTrigger>
</Style.Triggers>
</Style>
</UserControl.Resources>
...
<TextBox Name="ScriptArguments" Grid.Row="1" Grid.Column="1" VerticalAlignment="Center" Margin="5,5,0,0" Text="{Binding Path=ScriptArguments}" Style="{StaticResource ResourceKey=ArgumentsStyle}" />
...
謝謝!
容易(浪費4小時后:/)...屬性名稱的字符串不能包含Property 。
public static readonly DependencyProperty ExpectsFunctionProperty =
DependencyProperty.Register("ExpectsFunction", typeof(bool), typeof(MatlabScriptSettings), new PropertyMetadata(false));
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.