C# 单击WPF中自定义控件模板的事件

C# 单击WPF中自定义控件模板的事件,c#,wpf,events,wpf-controls,custom-controls,C#,Wpf,Events,Wpf Controls,Custom Controls,我在WPF中创建了一个自定义ContentControl,并应用了以下模板: <Style TargetType="{x:Type local:BdlUserControl}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="local:BdlUserControl">

我在WPF中创建了一个自定义ContentControl,并应用了以下模板:

<Style TargetType="{x:Type local:BdlUserControl}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="local:BdlUserControl">
                <Grid x:Name="ContentGrid">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="22"/>
                        <RowDefinition Height="1*"/>
                    </Grid.RowDefinitions>

                    <Grid Grid.Row="0" Background="White">
                        <StackPanel HorizontalAlignment="Right">
                            <Button Content="Close" Width="50" Name="BtClose" Click="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=BtClose_Click}"/>
                        </StackPanel>
                    </Grid>

                    <Grid Grid.Row="1">
                        <ContentPresenter Content="{TemplateBinding Content}" Margin="{TemplateBinding Padding}"/>
                    </Grid>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>
错误非常普遍:

A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in PresentationFramework.dll

关于为什么会发生这种情况的任何提示?

在WPF中,您只能绑定到一个
DependencyProperty
,在WPF中,botton有一个可以绑定的命令属性。命令是处理WPF中事件的MVVM方法

下面是WPF中命令绑定的一个快速示例

Xaml:

在上述示例中,单击按钮时将调用
MyClickCommand
中的
Execute
方法

现在,为了让这更方便用户,您可以使用
RelayCommand
实现,这允许将委托传递到命令实现中,在大多数情况下,这是在WPF中使用命令的最简单方法

例如:

Xaml:


代码:

公共部分类主窗口:窗口
{
公共主窗口()
{
MyCommand=新的RelayCommand(MyMethod);
初始化组件();
DataContext=this;
}
公共中继命令MyCommand{get;set;}
私有void MyMethod()
{
MessageBox.Show(“单击!”);
}
}
公共类中继命令:ICommand
{
只读操作_执行;
只读功能可执行;
public RelayCommand(Action execute):这个(execute,null){}
public RelayCommand(Action execute):这个(execute,null){}
公共RelayCommand(操作执行,函数执行)
{
if(execute==null)
抛出新的ArgumentNullException(“执行”);
_execute=p=>execute();
_canExecute=canExecute;
}
公共RelayCommand(操作执行,函数执行)
{
if(execute==null)
抛出新的ArgumentNullException(“执行”);
_执行=执行;
_canExecute=canExecute;
}
公共布尔CanExecute(对象参数)
{
return _canExecute==null?true:_canExecute();
}
公共事件事件处理程序CanExecuteChanged
{
添加{CommandManager.RequerySuggested+=value;}
删除{CommandManager.RequerySuggested-=value;}
}
public void Execute(对象参数)
{
_执行(参数);
}
}

示例:

您无法绑定到事件处理程序,您需要创建一个命令并将Buttons命令属性绑定到该命令。
A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in PresentationFramework.dll
<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="50" Width="100" >
    <Grid>
        <Button Content="Click" Command="{Binding MyCommand}" />
    </Grid>
</Window>
public partial class MainWindow : Window
{
    public MainWindow()
    {
        MyCommand = new MyClickCommand();
        InitializeComponent();
        DataContext = this;
    }

    public MyClickCommand MyCommand { get; set; }
}

public class MyClickCommand : ICommand 
{
    public bool CanExecute(object parameter) 
    {
        return true;
    }
    public event EventHandler CanExecuteChanged;

    public void Execute(object parameter)
    {
        MessageBox.Show("click!");
    }
}
<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="50" Width="100" >
    <Grid>
        <Button Content="Click" Command="{Binding MyCommand}" />
    </Grid>
</Window>
public partial class MainWindow : Window 
{
    public MainWindow()
    {
        MyCommand = new RelayCommand(MyMethod);
        InitializeComponent();
        DataContext = this;
    }

    public RelayCommand MyCommand { get; set; }

    private void MyMethod()
    {
        MessageBox.Show("Click!");
    }
}

public class RelayCommand : ICommand
{
    readonly Action<object> _execute;
    readonly Func<bool> _canExecute;

    public RelayCommand(Action execute) : this(execute, null) { }
    public RelayCommand(Action<object> execute) : this(execute, null) { }
    public RelayCommand(Action execute, Func<bool> canExecute)
    {
        if (execute == null)
            throw new ArgumentNullException("execute");

        _execute = p => execute();
        _canExecute = canExecute;
    }

    public RelayCommand(Action<object> execute, Func<bool> canExecute)
    {
        if (execute == null)
            throw new ArgumentNullException("execute");

        _execute = execute;
        _canExecute = canExecute;
    }

    public bool CanExecute(object parameter)
    {
        return _canExecute == null ? true : _canExecute();
    }

    public event EventHandler CanExecuteChanged 
    {
        add { CommandManager.RequerySuggested += value; }
        remove { CommandManager.RequerySuggested -= value; }
    }

    public void Execute(object parameter)
    {
        _execute(parameter);
    }
}