如何访问以 XAML 资源形式动态分配给控件的元素?
我的窗口中有以下资源,它声明某种 TabItem 的外观。
<Window.Resources>
<StackPanel x:Key="TabSearchContents" x:Shared="False"
Orientation="Vertical">
<Border
BorderThickness="3"
BorderBrush="Purple">
<TextBlock
Text="SEARCH BOOKS"
FontFamily="Verdana"
FontSize="25"
Foreground="Blue"
HorizontalAlignment="Center" />
</Border>
<StackPanel
Height="30"
Orientation="Horizontal"
Margin="5">
<TextBox
x:Name="txtSearch"
Width="650"
FontFamily="Comic Sans MS"
Foreground="Chocolate" />
<Button
x:Name="btnSearch"
Width="100"
Content="Go!"
Click="BtnSearch_Click" />
</StackPanel>
<Grid x:Name="gridResults">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="450"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ScrollViewer Grid.Column="0" VerticalScrollBarVisibility="Auto">
<ItemsControl x:Name="itmsSearch" ItemsSource="{Binding}" Padding="4"
ItemTemplate="{StaticResource SearchResultItemDT}">
</ItemsControl>
</ScrollViewer>
<StackPanel x:Name="stkpnlDetails">
</StackPanel>
</Grid>
</StackPanel>
</Window.Resources>
然后,在我的代码隐藏中,我动态创建一个选项卡并分配给窗口中已存在的 TabControl。
void BtnNewTab_Click(object sender, RoutedEventArgs e)
{
TabItem tb = new TabItem();
tb.Content = this.Resources["TabSearchContents"];
tb.DataContext = _bridge.SearchBooksByTitle("e");
tb.Header = "Wuttp yo!";
Button btnGo = ((Button)tb.FindName("btnSearch"));
ItemsControl i = (ItemsControl)tb.FindName("itmsSearch");
btnGo.Resources.Add("ResultList", i);
daTabs.Items.Add(tb);
tb.Focus();
}
我想访问在我的 XAML 资源中声明的 btnSearch 按钮。
实际上,此代码会抛出异常,因为 btnGo 结果为 null(以及 i),因为它无法通过 FindName() 找到预期的控件。
我读到了有关 RegisterName() 方法的信息,但它需要引用所需控件的实例...我没有。
I have the following resource in my window that declares how a certain kind of TabItem should look like.
<Window.Resources>
<StackPanel x:Key="TabSearchContents" x:Shared="False"
Orientation="Vertical">
<Border
BorderThickness="3"
BorderBrush="Purple">
<TextBlock
Text="SEARCH BOOKS"
FontFamily="Verdana"
FontSize="25"
Foreground="Blue"
HorizontalAlignment="Center" />
</Border>
<StackPanel
Height="30"
Orientation="Horizontal"
Margin="5">
<TextBox
x:Name="txtSearch"
Width="650"
FontFamily="Comic Sans MS"
Foreground="Chocolate" />
<Button
x:Name="btnSearch"
Width="100"
Content="Go!"
Click="BtnSearch_Click" />
</StackPanel>
<Grid x:Name="gridResults">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="450"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<ScrollViewer Grid.Column="0" VerticalScrollBarVisibility="Auto">
<ItemsControl x:Name="itmsSearch" ItemsSource="{Binding}" Padding="4"
ItemTemplate="{StaticResource SearchResultItemDT}">
</ItemsControl>
</ScrollViewer>
<StackPanel x:Name="stkpnlDetails">
</StackPanel>
</Grid>
</StackPanel>
</Window.Resources>
Then, in my code-behind, I dynamically create a tab and assign to the TabControl that is already present in my window.
void BtnNewTab_Click(object sender, RoutedEventArgs e)
{
TabItem tb = new TabItem();
tb.Content = this.Resources["TabSearchContents"];
tb.DataContext = _bridge.SearchBooksByTitle("e");
tb.Header = "Wuttp yo!";
Button btnGo = ((Button)tb.FindName("btnSearch"));
ItemsControl i = (ItemsControl)tb.FindName("itmsSearch");
btnGo.Resources.Add("ResultList", i);
daTabs.Items.Add(tb);
tb.Focus();
}
I want to access the btnSearch Button that is declared in my XAML resource.
As it is, this code throws an exception since btnGo turns out to be null (as well as i) since it can't find the expected control via FindName().
I read about the RegisterName() method, but it requires a reference to an instance of the required control... which I don't have.
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评论(1)
我不认为你应该像这样定义你的按钮,尝试以一种样式定义它,创建一个按钮并为按钮分配该样式,我认为你将能够通过这种方式得到你想要的东西。
myTheme.xaml
myCode.cs
希望这有帮助,
埃蒙
I dont think you should define your button like this, try defining it in a style, creating a button and assigning the button that style, i think you will be able to get what you are going for this way.
myTheme.xaml
myCode.cs
Hope this helps,
Eamonn