which method in ASP.NET life-cycle is only called once? It is not fired during postback

Question

Can we avoid using

If (!Postback) {.....code runs once....}

in Page_load()

Answer 1

I'm not particularly "hot" on ASP.NET events, but don't you think if there were a better approach (within the normal ASP.NET model) than the usual " if (!Postback) " one, everyone would already be using it?

I suspect there may be some cunning way of avoiding it, but only as "clever" code which will make it harder to maintain.

A single if statement isn't exactly horrendous...

(I'm not a big fan of the ASP.NET model to start with, admittedly... but if you're already within that model, there are worse things to contend with than this.)

Answer 2

This one is called only once:

 protected void Application_Start()

Google " global.asax " for more info.

Answer 3

If you want to happen the event not to occur in subsequest postbacks you have to write code in

if ( !IsPostBack )
{
} 

Answer 4

不，您不能，因为Web是无状态的，因此每个ASP.NET页在每次被请求时都需要加载。

Answer 5

There is no such event/method that you can hook up code in page life cycle that runs once. Every time the page instance passes through the same steps. That is the model.

Answer 6

There isn't an event that is only called once. In ASP.NET MVC you can distinguish between GET and POST using the AcceptVerbs attribute but that is just akin to IsPostBack , looking at the Request object.

Init is called before any ViewState is loaded so that might help, and the LoadViewState method is only called when a ViewState is loaded.

This is a simplification of the above link:

OnInit: 1
LoadViewState: 2
CreateChildControls: 3
OnLoad: 4
ShowButton: 5
OnPreRender: 6
Render: 7
OnUnload: 8

Number 3 can occur at any point in the chain.