WPF Menu item behaviour? - wpf

Question

I tried to look all around on the world wide web but with no success, I have a button in my application for opening a folder select dialog that it's implemented in that way:
<Button Grid.Column="0" Margin="5" Content="Select Folder" Style="{StaticResource MaterialDesignRaisedLightButton}">
<i:Interaction.Behaviors>
<FolderDialog:FolderDialogBehavior SetterName="FolderName"></FolderDialog:FolderDialogBehavior>
</i:Interaction.Behaviors>
</Button>
Now i need this behavior (with another SetterName of course) in a Menu Item, but there is no way for me to find a solution to accomplish my task, can anyone please help me out?
<Menu Background="#292A24" Foreground="Yellow" VerticalAlignment="Top" IsMainMenu="True">
<MenuItem Header="_File" Height="35">
<MenuItem Header="Export to csv">
<MenuItem.Icon>
<materialDesign:PackIcon Kind="Export" />
</MenuItem.Icon>
</MenuItem>
<MenuItem Header="Exit" InputGestureText="Ctrl+E">
<MenuItem.Icon>
<materialDesign:PackIcon Kind="ExitToApp" />
</MenuItem.Icon>
</MenuItem>
</MenuItem>
</Menu>

Answer 1

MenuItem has its own Click event. So you have to create new behavior class for MenuItem
public class FolderDialogBehavior : Behavior<MenuItem>
{
public string SetterName { get; set; }
protected override void OnAttached()
{
AssociatedObject.Click += OnClick;
}
protected override void OnDetaching()
{
AssociatedObject.Click -= OnClick;
}
private void OnClick(object sender, RoutedEventArgs e)
{
var dialog = new FolderBrowserDialog();
var result = dialog.ShowDialog();
if (result == DialogResult.OK && AssociatedObject.DataContext != null)
{
var propertyInfo = AssociatedObject.DataContext.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public)
.Where(p => p.CanRead && p.CanWrite)
.Where(p => p.Name.Equals(SetterName))
.First();
propertyInfo.SetValue(AssociatedObject.DataContext, dialog.SelectedPath, null);
}
}
}
If you want to have single behavior class you can define subscription via reflection
private RoutedEvent _clickEvent;
protected override void OnAttached()
{
var memberInfo = AssociatedObject.GetType().GetProperty("ClickEvent");
if (memberInfo == null)
{
return;
}
_clickEvent = memberInfo.GetValue(AssociatedObject) as RoutedEvent
if (_clickEvent == null)
{
return;
}
AssociatedObject.AddHandler(_clickEvent, OnClick);
}
protected override void OnDetaching()
{
if (_clickEvent == null)
{
return;
}
AssociatedObject.RemoveHandler(_clickEvent, OnClick);
}