从代码背后访问ButtonStyle内的Textblock文本 [英] Acces Textblock Text inside a ButtonStyle from codebehind
问题描述
如何通过自定义样式从后面的代码访问 tbRegistrationBtn.text 属性?
How to access the tbRegistrationBtn.text property from code behind from a custom made style?
我的按钮是从代码隐藏中动态创建的,并被添加到父控件(堆栈面板)中: 当我按下屏幕上的另一个按钮时,该按钮即会创建.
My button is being created dynamically from codebehind and gets added to the parent control (stackpanel): The button gets created when i press a other button on my screen.
隐藏代码:
Button newBtn = new Button();
newBtn.Width = 160;
newBtn.Height = 46;
newBtn.Style = this.FindResource("ButtonStyleRegistration") as Style;
spHorizontal.Children.Add(newBtn);
Xaml:
<Style x:Key="ButtonStyleRegistration" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Grid x:Name="registrationButton">
<Rectangle Fill="#FF89959A" Height="Auto" RadiusY="15" RadiusX="15" Stroke="White" Width="Auto"/>
<TextBlock x:Name="tbRegistrationBtn" TextWrapping="Wrap" Text="" HorizontalAlignment="Center" Margin="7.5,14.973,0,16.84" d:LayoutOverrides="Height"/>
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsFocused" Value="True"/>
<Trigger Property="IsDefaulted" Value="True"/>
<Trigger Property="IsMouseOver" Value="True"/>
<Trigger Property="IsPressed" Value="True"/>
<Trigger Property="IsEnabled" Value="False"/>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="FontSize" Value="10.667"/>
</Style>
任何尝试检索文本块的操作都会导致null错误. 尝试:
Any attempt to retrieve the textblock results in a null error. Attempt:
Style style = this.FindResource("ButtonStyleRegistration") as Style;
newBtn.Style = style;
TextBlock tb = (TextBlock)style.Resources.FindName("tbRegistrationBtn");
tb.Text = "test";
最诚挚的问候.
推荐答案
您可以使用VisualTreeHelper浏览按钮的可视树.使用此辅助功能:
You can use VisualTreeHelper to navigate though visual tree of your button. Use this helper function:
public static T FindVisualChild<T>(DependencyObject obj, string name)
where T : DependencyObject
{
var count = VisualTreeHelper.GetChildrenCount(obj);
for(int i = 0; i < count; i++)
{
var child = VisualTreeHelper.GetChild(obj, i);
if(child != null)
{
var res = child as T;
if(res != null && (string)res.GetValue(FrameworkElement.NameProperty) == name)
{
return res;
}
res = FindVisualChild<T>(child, name);
if(res != null) return res;
}
}
return null;
}
此外,您还需要强制按钮基于模板来构建它的可视树(因为默认情况下它是延迟的):
Also you need to force your button to build it's visual tree based on template (because it is delayed by default):
newBtn.ApplyTemplate();
最后设置您的TextBlock
文本:
var tb = FindVisualChild<TextBlock>(newBtn, "tbRegistrationBtn");
tb.Text = "Registration";
这篇关于从代码背后访问ButtonStyle内的Textblock文本的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!