Response.Redirect() 问题

Question

Throughout my program, I always used Response.Redirect() method. I always assumed that whenever this method is called, the current page is terminated and the redirected page is initiated. But then, i realized that Response.Redirect() has a second parameter: bool endResponse . So I concluded that the page doesnt get terminated...(Correct me if I'm wrong)

But at some point I needed to use Response.AddHeader("REFRESH","3;URL=mypage.aspx") to delay the page redirection. But now I'm afraid the page doesn't get terminated. So I decided to use Page.Unload event. But I don't know how to use it.

Anyone can explain to me how to properly end the life cycle of a page?

Answer 1

The page in both cases really much gets terminated.

The "default" of that 2nd value (true - default) means that the code will TERMINATE!

If you set the value = false, then the re-direct occurs, but any code you have that follows will keep running.

Thus:

    Response.Redirect("WebForm2.aspx")
    Debug.Print("this code will NOT run")

    or

    Response.Redirect("WebForm2.aspx", True)    ' true is default
    Debug.Print("this code will NOT run")

    but:

    Response.Redirect("WebForm2.aspx", False) 
    Debug.Print("this code WILL RUN - so will rest of code")

So, setting the value to true as you started or discovered? It will not change one thing, since that is/was the default in the first place.

So, if you use "false", then the code in that routine will continue to run until the sub exit (end sub) and then the other page will run along with its normal event cycle.

So, the true/false really just determines if you want a hard exit.

And if you have a few more lines of code that you need or want to run AFTER the response.redirect? Well, then one could:

Move the response.Redirect AFTER those lines of code, or as noted, use "false" to not terminate the execution of the code in the current sub.

so, if you include a false? Then the page re-direct occurs, but not until that sub routine in that code stub is done running.

Edit:

There seems to be some confusing over the Response.Redirect("WebForm2");

in c#, if we go to definition, we get this: Lets look at the SECOND over-load:

NO PLACE DO we see a suggested default exists for the 2nd value. (there is NOT a default)

And going to the def we see this:

Now how there are TWO methods (2nd is a overload)

And we can expand the 2nd one (without 2nd parameter). We see this:

and with the overload (with 2nd value), we see this:

Once again, that 2nd parameter does NOT have a specified default.

And a simple quick test will confirm that:

response.Redirect("some url")

Or

response.Redirect("some url",True)

BOTH produce the same effect - the code stub is terminated and exits.

If one wants the code stub to run out and continue to run, then using

Response.Redirect("some url", false)

is required.