So, I have a listbox in wpf that contains as a template (windows forms user control) using WindowsFormsHost,o do this, I additionally created my own host (UserControl3Host), which stores the dependency properties and the windows forms user control event property,see code

Host

public class UserControl3Host : WindowsFormsHost
{
    private readonly UserControl3 userControl = new UserControl3() { Title = string.Empty, 
    Date = string.Empty };
    public delegate void expandedDel2(object sender);       
    public UserControl3Host()
    {
        Child = userControl;
        ConditionalClick  = new RoutedEventHandler(userControl.label1_Click);
    }
    /// <summary>
    /// Заголовок контрола.
    /// </summary>        
    /// <summary>
    /// Заголовок контрола.
    /// </summary>
    public event RoutedEventHandler ConditionalClick
    {
        add
        {
            AddHandler(ConditionalClickEvent, value);
        }
        remove
        {
            RemoveHandler(ConditionalClickEvent, value);
        }
    }
    public string Title
    {
        get => (string)GetValue(TitleProperty);
        set => SetValue(TitleProperty, value);
    }
    public string Date
    {
        get => (string)GetValue(DateProperty);
        set => SetValue(DateProperty, value);
    }
    public static readonly RoutedEvent ConditionalClickEvent = 
   EventManager.RegisterRoutedEvent(
   name: "ConditionalClick",
   routingStrategy: RoutingStrategy.Tunnel,
   handlerType: typeof(RoutedEventHandler),
   ownerType: typeof(UserControl3Host));  

    public static readonly DependencyProperty TitleProperty =
        DependencyProperty.Register(nameof(Title), typeof(string), typeof(UserControl3Host), 
     new PropertyMetadata(string.Empty, OnTitleChanged, OnCoerceTitle));



    public static readonly DependencyProperty DateProperty =
       DependencyProperty.Register(nameof(Date), typeof(string), typeof(UserControl3Host), new 
  PropertyMetadata(string.Empty, OnDateChanged, OnCoerceTitle));

    private static void OnDateChanged(DependencyObject d, DependencyPropertyChangedEventArgs 
   e)
    {
        UserControl3Host host = (UserControl3Host)d;
        host.userControl.Date = e.NewValue.ToString();
    }

    private static void OnTitleChanged(DependencyObject d, DependencyPropertyChangedEventArgs 
    e)
    {
        UserControl3Host host = (UserControl3Host)d;
        host.userControl.Title = e.NewValue.ToString();
    }
    private static object OnCoerceTitle(DependencyObject d, object baseValue)
    {
        return baseValue ?? string.Empty;
    }
   
  }
 } 

The host itself is located in the wpf element(Listbox)

Xaml

    <UserControl x:Class="WindowsFormsApp12.UserControl4"
         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" 
         xmlns:local="clr-namespace:WindowsFormsApp12"
         mc:Ignorable="d" 
         d:DesignHeight="450" d:DesignWidth="800">
       <ListBox.ItemTemplate>
            <DataTemplate DataType="local:Line">
                <Border Style="{StaticResource MessageBorder}" HorizontalAlignment="Stretch">
                    <StackPanel Orientation="Vertical" MouseDown="StackPanel_MouseDown">
                        <local:UserControl3Host  Title="{Binding Name}" Date="{Binding Date}" 
                    ConditionalClick="UserControl3Host_ConditionalClick"> 
                    </local:UserControl3Host>
                    </StackPanel>
                </Border>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
  </Border>
 </UserControl>

xaml.cs

public partial class UserControl4 : System.Windows.Controls.UserControl
{     
    public UserControl4()
    {          
        InitializeComponent();           
    }
    public delegate void expandedDel(object sender);

    public event expandedDel isCollapsed;                      
    private void UserControl3Host_ConditionalClick(object sender, RoutedEventArgs e)
    {
        if (isCollapsed != null)
        {
            isCollapsed(this);
        }
    }
}

Code Windows forms element

namespace WindowsFormsApp12
{
public partial class UserControl3 : UserControl
{
    public readonly UserControl5 userControl2 = new UserControl5() { };
    #region Propertyies
    public UserControl3()
    {
        InitializeComponent();
      
    }      
    private string _title;
    private string _date;
    private Image _image;
    private Color _iconBack;
    [Category("Custom Props")]
    public string Title
    {
         get {return _title; }
         set {_title = value; label1.Text = value; }
    }
    [Category("Custom Props")]
    public string Date
    {
        get { return _date; }
        set { _date = value; label2.Text = value; }
    }
    [Category("Custom Props")]
    public Image Image
    {
        get { return _image; }
        set { _image = value;pictureBox1.Image = value; }
    }
    [Category("Custom Props")]
    public Color IconBackGround
    {
        get { return _iconBack; }
        set { _iconBack = value; panel1.BackColor =value ; }
    }

    #endregion
    public delegate void CallFormMethod(object obj,string text); //делегат
    public event CallFormMethod onButtonClick;    
    private void UserControl3_MouseEnter(object sender, EventArgs e)
    {
        this.BackColor = Color.FromArgb(30, 35, 40);
    }
   
    private void UserControl3_MouseLeave_1(object sender, EventArgs e)
    {
       
        this.BackColor = Color.FromArgb(50, 50, 50);
    }

   public void label1_Click(object sender, EventArgs e)
    {
        
        onButtonClick(this,label1.Text);
        
    }

    public void label2_Click(object sender, EventArgs e)
    {
        onButtonClick(this, label1.Text);
    }

    public void pictureBox1_Click(object sender, EventArgs e)
    {
        onButtonClick(this, label1.Text);
    }

    public void panel2_Click(object sender, EventArgs e)
    {
        onButtonClick(this, label1.Text);
    }

    private void UserControl3_Click(object sender, EventArgs e)
    {
        onButtonClick(this, label1.Text);
    }
 }

Now about the problem itself! When launching the program and clicking on the user control in the listbox. Events occur in label click, panel click...(Windows forms events). I need that event work in wpf main window with handler.

 private void UserControl3Host_ConditionalClick(object sender, RoutedEventArgs e)
        {
            if (isCollapsed != null)
            {
                isCollapsed(this);
            }
        }  

i try to use in my xaml ConditionalClick="UserControl3Host_ConditionalClick"> and after what
ConditionalClick = new RoutedEventHandler(userControl.label1_Click) in my host where conditional click was created. I dont know, how iw works. Maybe you know ,how i can catch event or raise event in my windows forms control

CodePudding user response：

Handle the events for UserControl3 in your WindowsFormsHost and raise your ConditionalClick event from the event handlers for the Windows Forms events by calling RaiseEvent(new RoutedEventArgs(ConditionalClickEvent)):

public UserControl3Host()
{
    Child = userControl;
    userControl.label1.Click  = (ss, ee) => RaiseEvent(new RoutedEventArgs(ConditionalClickEvent));
}