I have the following query:
In ASP.NET Global.ascx file following HttpApplication events are defined:
protected void Application_Start(object sender, EventArgs e)
{
}
protected void Session_Start(object sender, EventArgs e)
{
}
protected void Application_BeginRequest(object sender, EventArgs e)
{
}
protected void Application_AuthenticateRequest(object sender, EventArgs e)
{
}
protected void Application_Error(object sender, EventArgs e)
{
}
protected void Session_End(object sender, EventArgs e)
{
}
protected void Application_End(object sender, EventArgs e)
{
}
As I can understand, these are HttpApplication event handlers. But there are lots of other events also. Are the Global.ascx events are only registered events? If not then, What are the other events those had been registered?
Also, say I have implemented a HttpModule on implementing Application_BeginRequest eventhandler. Now, the ASP.NET Framework also implemented the same. Then would my implementation overrides the Framework ones?
You can attach as many as handlers to an event. For more information read MSDN pages on - Handling events.
Read MSDN - Life Cycle Events and the Global.asax file and ASP.NET Application Life Cycle Overview for IIS 7.0
Related
Properties window asp.net: Just like other controls have that thunderbolt icon, when you select the entire form itself, I don't see a thunderbolt for the page level events.
When you double click on the form, Load is created for you.
But there are other page level events, and I expected to see them and define them, through properties window.
But for the form itself, there is none. See screenshot.
Is this by design? Or am I experiencing an anomaly?
My guess is that maybe the event recognized by the web page through the name of the method itself (Like page load is always Page_Load, etc.)
Click here for screenshot...No Thunderbolt:
Yes, I think this is by design. Only certain event names are recognized.
You can type this in, and it will recognize these event names and do accordingly:
protected void Page_PreInit(object sender, EventArgs e)
{ Response.Write("Page_PreInit" + "<br/>"); }
protected void Page_Init(object sender, EventArgs e)
{ Response.Write("Page_Init" + "<br/>"); }
protected void Page_InitComplete(object sender, EventArgs e)
{ Response.Write("Page_InitComplete" + "<br/>"); }
protected void Page_PreLoad(object sender, EventArgs e)
{ Response.Write("Page_PreLoad" + "<br/>"); }
protected void Page_LoadComplete(object sender, EventArgs e)
{ Response.Write("Page_LoadComplete" + "<br/>"); }
protected void Page_PreRender(object sender, EventArgs e)
{ Response.Write("Page_PreRender" + "<br/>"); }
protected void Page_PreRenderComplete(object sender, EventArgs e)
{ Response.Write("Page_PreRenderComplete" + "<br/>"); }
protected void Page_Unload(object sender, EventArgs e)
{
//Response.Write("Page_Unload" + "<br/>");
}
We use ASP.NET 4.5 (VS 2013) and want to replace Global.asax.cs with new Startup.cs file, which comes from OWIN specification.
We need to replace Application_AcquireRequestState, Session_Start and Session_End handlers with something in Startup.cs file. It looks as following in Global.asax.cs:
protected void (Object sender, EventArgs e)
{
SessionCounter.AddSessionPage(Context);
}
protected void Session_Start(Object sender, EventArgs e)
{
}
protected void Session_End(Object sender, EventArgs e)
{
LoginLog.RegisterLogOff(Context);
SessionCounter.AbandonSession(Context);
}
How can we do that?
OWIN has no definition for session and cannot fully replace the Global.asax.cs file.
Try ASP.NET 5, it moves everything from Global.asax.cs to Startup.cs. https://github.com/aspnet/home
Here is my code and i want to call the my custom method (Application_My()) automatically when application is loaded/refresh every time like Application_OnEndRequest().
Thanks in advance.
<%# Application Language="C#" %>
<script runat="server">
// THis code will be executed automatically when page is reloaded everytime
/*protected void Application_OnEndRequest()
{
Response.Write("Thsi page is executed on=" + DateTime.Now.ToString());
}*/
// how to call below method automatically when page is reloaded everytime
//such as above
protected void Application_My()
{
Response.Write("Hi welcome");
}
protected void Application_Start(object sender, EventArgs e)
{
}
protected void Session_Start(object sender, EventArgs e)
{
}
protected void Application_BeginRequest(object sender, EventArgs e)
{
}
protected void Application_AuthenticateRequest(object sender, EventArgs e)
{
}
protected void Application_Error(object sender, EventArgs e)
{
}
protected void Session_End(object sender, EventArgs e)
{
}
protected void Application_End(object sender, EventArgs e)
{
}
protected void Application_EndRequest(object sender, EventArgs e)
{
Application_My();
}
However, note that this is called for everything that is managed by your aspnet pipeline, so you might get called on css and image requests.
You could add Debug.WriteLine(Request.Url); to the code above to see what happens when you enter your site.
In my application, i am trying to get button_click event in another button click event, but it is not working.
My code is,
protected void btn1_Click(object sender, EventArgs e)
{
Response.Write("hi.....");
}
protected void btn2_Click(object sender, EventArgs e)
{
btn1.Click += new EventHandler(this.btn1_Click);
}
What is wrong with this?
I suppose you want to call the code of btn1_click event.
If this is the case, you simple call it as a method in your btn2_Click.
protected void btn2_Click(object sender, EventArgs e)
{
btn1_Click (sender, e);
}
How can I use the PostAuthenticateRequest event of Global.asax? I'm following this tutorial and it mentions that I have to use the PostAuthenticateRequest event. When I added the Global.asax event it created two files, the markup and the code-behind file. Here is the content of the code-behind file
using System;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;
namespace authentication
{
public class Global : System.Web.HttpApplication
{
protected void Application_Start(object sender, EventArgs e)
{
}
protected void Session_Start(object sender, EventArgs e)
{
}
protected void Application_BeginRequest(object sender, EventArgs e)
{
}
protected void Application_AuthenticateRequest(object sender, EventArgs e)
{
}
protected void Application_Error(object sender, EventArgs e)
{
}
protected void Session_End(object sender, EventArgs e)
{
}
protected void Application_End(object sender, EventArgs e)
{
}
}
}
Now when I type the
protected void Application_OnPostAuthenticateRequest(object sender, EventArgs e)
It is successfully called. Now I want to know how is the PostAuthenticateRequest bound to this Application_OnPostAuthenticateRequest method? How can I change the method to some other?
Magic..., a mechanism called Auto Event Wireup, the same reason you can write
Page_Load(object sender, EventArgs e)
{
}
in your code-behind and the method will automatically be called when the page loads.
MSDN description for System.Web.Configuration.PagesSection.AutoEventWireup property:
Gets or sets a value indicating whether events for ASP.NET pages are automatically connected to event-handling functions.
When AutoEventWireup is true, handlers are automatically bound to events at run time based on their name and signature. For each event, ASP.NET searches for a method that is named according to the pattern Page_eventname(), such as Page_Load() or Page_Init(). ASP.NET first looks for an overload that has the typical event-handler signature (that is, it specifies Object and EventArgs parameters). If an event handler with this signature is not found, ASP.NET looks for an overload that has no parameters. More details in this answer.
If you wanted to do it explicitly you would write the following instead
public override void Init()
{
this.PostAuthenticateRequest +=
new EventHandler(MyOnPostAuthenticateRequestHandler);
base.Init();
}
private void MyOnPostAuthenticateRequestHandler(object sender, EventArgs e)
{
}