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Custom UserControl events


Custom UserControl events

By : user2955009
Date : November 22 2020, 10:33 AM
I hope this helps . I would also suggest making a CustomControl, but if you want to use your UserControl you will need to add a DependencyProperty in your code behind.
code :
public partial class Prompt : UserControl
{
    private bool _canExecute;
    private EventHandler _canExecuteChanged;

    /// <summary>
    /// DependencyProperty for the OKCommand property.
    /// </summary>
    public static readonly DependencyProperty OKCommandProperty = DependencyProperty.Register("OKCommand", typeof(ICommand), typeof(Prompt), new PropertyMetadata(OnOKCommandChanged));

    /// <summary>
    /// Gets or sets the command to invoke when the OKButton is pressed.
    /// </summary>
    public ICommand OKCommand
    {
        get { return (ICommand)GetValue(OKCommandProperty); }
        set { SetValue(OKCommandProperty, value); }
    }

    /// <summary>
    /// Gets a value that becomes the return value of
    /// System.Windows.UIElement.IsEnabled in derived classes.
    /// </summary>
    protected override bool IsEnabledCore
    {
        get { return base.IsEnabledCore && _canExecute; }
    }

    // Command dependency property change callback. 
    private static void OnOKCommandChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        Prompt p = (Prompt)d;
        p.HookUpCommand((ICommand)e.OldValue, (ICommand)e.NewValue);
    }

    public Prompt()
    {
        InitializeComponent();
    }

    // Add the command. 
    private void AddCommand(ICommand command)
    {
        EventHandler handler = new EventHandler(CanExecuteChanged);
        _canExecuteChanged = handler;
        if (command != null)
            command.CanExecuteChanged += _canExecuteChanged;
    }

   private void CanExecuteChanged(object sender, EventArgs e)
    {
        if (OKCommand != null)
            _canExecute = OKCommand.CanExecute(null);

        CoerceValue(UIElement.IsEnabledProperty);
    }

    // Add a new command to the Command Property. 
    private void HookUpCommand(ICommand oldCommand, ICommand newCommand)
    {
        // If oldCommand is not null, then we need to remove the handlers. 
        if (oldCommand != null)
            RemoveCommand(oldCommand);

        AddCommand(newCommand);
    }

    // Remove an old command from the Command Property. 
    private void RemoveCommand(ICommand command)
    {
        EventHandler handler = CanExecuteChanged;
        command.CanExecuteChanged -= handler;
    }
}


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Why don't custom events show up in Blend for a UserControl?

Why don't custom events show up in Blend for a UserControl?


By : user1502812
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Think i've found my own answer:
Sounds like its a limitation of Blend.
Custom events in XAML on my UserControl on Windows Phone 7

Custom events in XAML on my UserControl on Windows Phone 7


By : user3746958
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Add event to your UserControl like code below and it will appears like normal event
code :
    public partial class UserControl1 : UserControl
    {
       public delegate void ValueChangedEventHandler(object sender, EventArgs e);

       public event ValueChangedEventHandler ValueChanged;

       public UserControl1()
       {
           // Required to initialize variables
           InitializeComponent();
       }

       private void Button_Click(object sender, System.Windows.RoutedEventArgs e)
       {
          if (ValueChanged != null)
          {
              ValueChanged(this, EventArgs.Empty);
          }
       }
   }
   private void UserControl1_ValueChanged(object sender, System.EventArgs e)
    {
        // TODO: Add event handler implementation here.
    }
Updatepanel causing full postback with usercontrol custom events

Updatepanel causing full postback with usercontrol custom events


By : DisplayName=
Date : March 29 2020, 07:55 AM
help you fix your problem I have seen this question before, but none of the answers seems to work for me. This is my updatePanel section (inside hi.ascx): , That solved the problem:
code :
    Protected Sub rpPaging_onItemCreated(ByVal sender As Object, ByVal e As RepeaterItemEventArgs)

    Dim lb = e.Item.FindControl("lbPage")
    If lb IsNot Nothing Then _
        ScriptManager.GetCurrent(Page).RegisterAsyncPostBackControl(lb)

End Sub
How can i call method from UserControl to another UserControl or another aspx.Page using Events?

How can i call method from UserControl to another UserControl or another aspx.Page using Events?


By : A Leslie
Date : March 29 2020, 07:55 AM
wish helps you The button is part of the page so it has visibility of all the controls in the page so why can't you access the control instances like this, presuming your control instance names are UCCheckBox1 and UCTextBox1:
code :
 protected void SetButton_Click(object sender, EventArgs e)
        {
           if (UCCheckBox1.IsChecked) {
               UCTextBox1.hideTextboxes();
           }
        }
Events in Asp.Net Webforms custom UserControl

Events in Asp.Net Webforms custom UserControl


By : Harsh Panwar
Date : March 29 2020, 07:55 AM
Hope that helps try to just override the OnInit event in the Page and add the handler to your event there.
like this:
code :
protected override void OnInit(EventArgs e)
{
    base.OnInit(e);
    InitDateFilter(SearchDate);
}
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