[英]WPF can't find resource
我有一個關於在WPF中查找資源的問題,並且閱讀了從書本中查找資源的機制。
它說UIElement將首先找到其資源屬性,如果不合適,則將找到其父級的資源屬性,依此類推,直到應用程序資源屬性為止。
我認為這就像泡沫事件一樣。
所以我在stackpanel中定義了一個資源,這里是xaml。
<Window x:Class="DynamicResource.MainWindow"
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:DynamicResource"
mc:Ignorable="d"
Title="MainWindow" Height="350" Width="525">
<StackPanel x:Name="stackPanel">
<StackPanel.Resources>
<TextBlock x:Key="res1" Text="this is staticresource" Background="Beige"></TextBlock>
<TextBlock x:Key="res2" Text="this is dynamicresource" Background="DarkGoldenrod"></TextBlock>
</StackPanel.Resources>
<Button Margin="5,5,5,0" Content="{StaticResource res1}"></Button>
<Button Margin="5,5,5,0" Content="{DynamicResource res2}"></Button>
<Button x:Name="button" Margin="5,5,5,0" Content="refresh resource" Click="Button_Click"></Button>
</StackPanel>
然后我嘗試在按鈕單擊事件中更改動態資源,這是xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
//Can find target resource
//stackPanel.Resources["res1"] = new TextBlock() { Text = "this is new staticresource", Background = new SolidColorBrush(Colors.Tan) };
//stackPanel.Resources["res2"] = new TextBlock() { Text = "this it new dynamicresouce", Background = new SolidColorBrush(Colors.Magenta) };
//Can't find target resource
button.Resources["res1"] = new TextBlock() { Text = "this is new staticresource", Background = new SolidColorBrush(Colors.Tan) };
button.Resources["res2"] = new TextBlock() { Text = "this it new dynamicresouce", Background = new SolidColorBrush(Colors.Magenta) };
}
}
但是按鈕的資源沒有改變。
那么,發生這種情況的原因是什么,以及如何大量地尋找資源。
您必須為按鈕設置名稱,並在后面的代碼中使用該名稱
在xaml中:
<Button Margin="5,5,5,0" Name="btnRes2" Content="{DynamicResource res2}"></Button>
在后面的代碼中:
private void Button_Click(object sender, RoutedEventArgs e)
{
btnRes2.Resources["res2"] = new TextBlock() { Text = "this it new dynamicresouce", Background = new SolidColorBrush(Colors.Magenta) };
}
此代碼適用於DynamicResource。
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