捕获派生类中通用按钮的单击事件
本文关键字：按钮 单击 事件 派生 | 更新日期: 2023-09-27 17:58:25
我正在开发一个WPF应用程序，其中大多数控件都是在运行时动态创建的。为了保存一些代码，我创建了各种静态控件。现在，我想创建一个文本框控件，旁边有一个删除按钮。我现在遇到的问题是，如何捕捉控件的事件？（参见代码）
编辑：按照建议，我尝试创建一个自定义控件。但是，我无法使自定义事件正常工作。也就是说，在wpf页面中，我找不到用于挂接处理程序的delete Event。我哪里出错了？到目前为止，我发现当我删除: Grid语句时，会显示Event。
public class tbTextReadOnlyWithDeleteButton : Grid
{
public event EventHandler Delete;
public tbTextReadOnlyWithDeleteButton(int gridrow, int gridcol, string feldname, object quelle, string ctlname, object tag)
{
Grid gr = new Grid() { Name = "grMit_" + gridrow + "_" + gridcol + "_" + ctlname };
gr.SetValue(Grid.RowProperty, gridrow);
gr.SetValue(Grid.ColumnProperty, gridcol);
gr.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(30) });
gr.ColumnDefinitions.Add(new ColumnDefinition());
gr.Tag = tag;
Button bu = new Button() { Name = "buLoeschen" };
bu.SetValue(Grid.ColumnProperty, 0);
bu.Margin = new Thickness(5, 5, 5, 5);
bu.Content = "'xE10A";
bu.FontFamily = new FontFamily("Segoe MDL2 Assets");
bu.FontSize = 10;
bu.Tag = quelle;
bu.Click += Bu_Click;
TextBox tb = new TextBox();
tb.SetValue(Grid.RowProperty, 0);
tb.SetValue(Grid.ColumnProperty, 1);
tb.IsReadOnly = true;
tb.VerticalContentAlignment = VerticalAlignment.Center;
tb.HorizontalContentAlignment = HorizontalAlignment.Left;
tb.Background = new SolidColorBrush() { Opacity = 1 };
tb.BorderThickness = new Thickness(0);
tb.TextWrapping = TextWrapping.Wrap;
BindingOperations.SetBinding(tb, TextBox.TextProperty, new Binding(feldname) { Source = quelle, Mode = BindingMode.OneWay });
gr.Children.Add(bu);
gr.Children.Add(tb);
}
private void Bu_Click(object sender, RoutedEventArgs e)
{
Delete(sender, e);
}
}
// in the page it looks like this:
Grid tbMit = new tbTextReadOnlyWithDeleteButton(1, 0, "Name", mit, "name", dat);
tbMit.Delete // <-- Why can't this be found??
结束编辑
// Control
public static Grid tbTextReadOnlyWithDeleteButton(int gridrow, int gridcol, string feldname, object quelle)
{
Grid gr = new Grid();
gr.SetValue(Grid.RowProperty, gridrow);
gr.SetValue(Grid.ColumnProperty, gridcol);
gr.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(30)});
gr.ColumnDefinitions.Add(new ColumnDefinition());
Button bu = new Button() { Name = "buDelete" };
bu.SetValue(Grid.ColumnProperty, 0);
bu.Margin = new Thickness(5, 5, 5, 5);
bu.Content = "'xE10A";
bu.FontFamily = new FontFamily("Segoe MDL2 Assets");
bu.FontSize = 10;
bu.Tag = quelle;
TextBox tb = new TextBox();
tb.SetValue(Grid.RowProperty, 0);
tb.SetValue(Grid.ColumnProperty, 1);
tb.IsReadOnly = true;
tb.VerticalContentAlignment = VerticalAlignment.Center;
tb.HorizontalContentAlignment = HorizontalAlignment.Left;
tb.Background = new SolidColorBrush() { Opacity = 1 };
tb.BorderThickness = new Thickness(0);
tb.TextWrapping = TextWrapping.Wrap;
BindingOperations.SetBinding(tb, TextBox.TextProperty, new Binding(feldname) { Source = quelle, Mode = BindingMode.OneWay });
gr.Children.Add(bu);
gr.Children.Add(tb);
return gr;
}
// Usage in Code
Grid tbMit = glCtlTextbox.tbTextReadOnlyWithDeleteButton(1, 0, "Name", mit);
spStackpanel.Children.Add(tbMit);
//Now I need something like this, which is not working
tbMit.buDelete.Click += buDelete__Click;
有人暗示过如何处理这件事吗？
谢谢！
您有两个解决方案来定义您的用户控件：
- XAML+代码隐藏
- 代码
在第一个例子中，您找不到Delete，因为您将类强制转换为Grid。
网格定义中没有Delete事件。
你应该这样做：
tbTextReadOnlyWithDeleteButton tbMit = new tbTextReadOnlyWithDeleteButton(1, 0, "Name", mit, "name", dat);
tbMit.Delete += your_event_handler;
我建议您使用XAML+代码隐藏方法。（没有人只使用代码来定义控件）
您可以右键单击Visual Studio中项目的任何文件夹，然后选择"用户控件"。
您将自动拥有以下文件：
- your_control.xaml
- your_control.xaml.cs
C#+XAML：
c#：
public partial class your_control : UserControl
{
public delegate void delete_event_handler(your_control sender);
public event delete_event_handler delete;
public your_control()
{
this.InitializeComponent();
}
private void on_bu_click(object sender, RoutedEventArgs e)
{
// the event is null if there is no listeners bind to it
if (this.delete != null)
this.delete(this);
}
}
和XAML：
<UserControl x:Class="test_wpf.your_control"
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="300" d:DesignWidth="300">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="3*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<!-- Use the FieldModifier property to define the visibility of the control outside the class-->
<TextBlock x:Name="tb" x:FieldModifier="private" >Your text</TextBlock>
<Button Grid.Column="1" x:Name="bu" x:FieldModifier="private" Click="on_bu_click">Delete</Button>
</Grid>
然后
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
your_control control = new your_control();
control.delete += on_delete;
}
public void on_delete(your_control sender)
{
// your stuff
}
}
仅代码方法：
public class your_control : UserControl
{
public TextBox tb { get; private set; }
public Button bu { get; private set; }
private Grid container;
public your_control (/* your params*/)
{
this.tb = this.build_textbox();
this.bu = this.build_button();
this.container = new Grid();
this.Content = this.container;
this.container.Children.Add(this.tb);
this.container.Children.Add(this.bu);
}
private TextBox build_textbox()
{
TextBox tb = new TextBox();
return tb;
}
private Button build_button()
{
Button bu = new Button();
return bu;
}
}
然后：
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
your_control control = new your_control ();
control.bu.Click += on_bu_click;
}
public void on_bu_click(object sender, EventArgs e)
{
// your stuff
}
}