为什么连续调用Server.Transfer会更改URL？

Question

I'm using Server.Transfer to load the contents of another page when clicking a button. This works as expected and the url stays the same. However, if I try to load a third page at the click of a button in the second page, the url changes to that of the second page. I would expect it to keep the url of the first page.

Example:

1. Page1.aspx loads.
   • Url: .../Page1.aspx
   • Content: Page1.aspx
2. Server.Transfer("~/Page2.aspx") on button click.
   • Url: .../Page1.aspx
   • Content: Page2.aspx
3. Server.Transfer("~/Page3.aspx") on button click
   • Url: .../Page2.aspx
   • Content: Page3.aspx

Why does the url change in the third step?

Answer 1

When you call Server.Transfer() the execution of the 1st page is stopped and the 2nd page is executed instead within the same HTTP request. The 2nd page (Page2.aspx) is then executed in the same way that it would be for a any normal request made directly to its URL, so the action of the form is set to its own URL (despite being called from Server.Transfer() ).

If this was not the case then when the form is submitted it would post to Page1.aspx (as you are expecting), but this page would not necessarily contain the same controls and be able to process the request.

Answer 2

这可能会有所帮助：

Response.Redirect("~/page.aspx",false)