- #Set icon in treeview for usercontrol visual studio how to
- #Set icon in treeview for usercontrol visual studio code
Ontario, Canada M5J 2N8 +1 (416) 849-8900 A suggestion in the forum was to set IsHitTestVisible Adjust dropdown arrow margin of WPF TreeView. Since the first parameter passed to any event is a reference to the object that fired the event, you can retrieve a reference to the Button that called the event by converting your Click event's Sender parameter to a Button.Telerik UI for WPF is also available as part of Telerik DevCraft UI, Telerik DevCraft Complete or For your reference i also attached a screen shot to give you a clear look. The best solution is to set each Button's CommandArgument to the letter that the button represents (e.g., "A"). This raises the problem of determining which button called the event. , I also recommended using one event routine to handle the Click events for all 26 buttons on the page.
#Set icon in treeview for usercontrol visual studio code
Normally, I'd put this code in the User Control's file after the User Control's "End Class" line.
The read-only property that makes the data available (and the end of the class) would look like this: Public ReadOnly Property ButtonLetter() As String The opening of the ButtonDataEventArgs class with the constructor that's used to initialize the class' internal variable would look like this: Public Class ButtonDataEventArgs Typically, you set the values made available through the read-only properties in the New method of the class.įor my reader's case, we want the ButtonDataEventArgs class to have a ButtonLetter property that would allow the host page to find out what letter was stored in the object when it was created. Your class must inherit from System.EventArgs and normally has a set of read-only properties that the host page will read when it catches the event. The last step in this process is to create the class that you'll use to pass data in the event's second parameter. For the "A" Button on the page, that code would look like this: Private Sub AButton_Click(.) Handles AButton.Click In my reader's case, he wanted to initialize the class in the second parameter with the letter that the Button that fired the event represented. When you fire the event you must set the two parameters specified in the delegate. With the delegate defined, you can declare an event that uses it: Public Event LinkEvent As ButtonDataEventHandlerĪnd with the event defined, you can fire the event in one of the Click events for the buttons on the page. This example defines a delegate called ButtonDataEventHandler. By convention, the delegate used for events has a name that ends in "Handler" and has two parameters: The first parameter is of type Object and is a reference to the object that fired the event, while the second event is a custom class that you initialize with information to pass to the host page. To fire an event from your UserControl, you first need to declare a delegate that specifies the format of your event. The best solution is to fire an event from the User Control that the host page can catch. My reader had a User Control with 26 buttons, one for each letter of the alphabet, and wanted to integrate the control with the host page by passing the letter represented by the button to the host page. The original problem was raised by one of this column's readers (yes, they do exist). Firing events isn't an ASP.NET-specific topic but because it's critical to integrating User Controls with their host page, it's worth discussing here.
#Set icon in treeview for usercontrol visual studio how to
, I talked about how to treat a User Control as an object, but I skipped over how to get your User Control to fire an event. If firing your own events is new to you, here's a step-by-step guide. To fully exploit User Controls, you need to treat them as object - which includes having them fire events. Practical ASP.NET Adding Events to User Controls
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