Does C# have a Handles keyword?

Question

Protected Sub Menu1_MenuItemClick(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.MenuEventArgs) Handles Menu1.MenuItemClick


End Sub

In VB.net, we have the Handles keyword, I'm wondering if C# has anything comparable. Or do you have to manually wire all the methods to each control's event (in ASP.NET especially)?

Cum

Answer 1

Nope. You will have to wire up the event like this

Menu1.MenuItemClick += Menu1_MenuItemClick;

Terpsichore

So do you have to do this all in the Page_Load event or somewhere else? What's the best way to handle this in C#? – Cum

@Cum for asp.net you can do it in the markup if that's possible ,like <asp:Menu ID="Menu1" runat="server" OnMenuItemClick="Menu1_MenuItemClick"> if not you can do it from code in Page_Load or probably Page_Init – Terpsichore

Answer 2

You have to assign the events yourself using the += syntax.

Fairbanks

Answer 3

Its pretty easy to setup handlers in C#. In my option much easier than VB.Net. You'll need to make sure the handler gets setup early enough in the page to get fired off. Just type in the object name (Menu1) . (the name of the event) the "+=" and hit tab twice. Visual Stuido will generate everything for you.

Beverlee

Nice, I didn't knew I could use 'tab twice' in that spot – Impersonality

Answer 4

Generally this goes right in the markup.

<asp:Menu ID="Menu1" runat="server" onmenuitemclick="Menu1_MenuItemClick"></asp:Menu>

and in the codebehind it looks like

protected void Menu1_MenuItemClick(object sender, MenuEventArgs e)
{

}

You can generate all of this in Visual Studio from the designer. Select the menu control, go to the properties window (f4), view the events list (the lightning bolt) and double click the event name.

You can also subscribe an event handler manually with += but you have to do it every time the page loads.

Forfeiture

Answer 5

If you don't mind doing so, you can always set the AutoEventWireUp to "true". Then C# will automatically bind event handlers with "VB" names.

Sulla

There is a performance penalty for this: msdn.microsoft.com/en-us/library/… – Deduction

So, you comment on a 4.5 year old post, commenting a web techology that is soon to be replaced. OK. Yes, there is a penalty by doing this. But System.Web is a big performance hog in itself, that's why dotnet core is due in few weeks... :) – Sulla