ASP.NET页面'Page_Load'在Master Page的'Page_Load'事件之前触发？

Question

On my Master Page, I have a little method in the Page_Load event that checks to see if a user is logged in, and redirects them to the Login page if not.

The problem is that for some of my pages the Page_Load events presume a users logged are in, and these events seems to fire before the login check in the master page, which causes errors.

What are some ways around this? Any events I can use other than Page_Load in my pages, that'll fire after the master page?

Answer 1

You have a rich Page Cycle with lots of events to use. Perhaps you could use Page_Init to check if the user is logged-in in the Master Page. Or use Page_PreRender in the other pages.

Answer 2

If you need things to occur in the MasterPage Page_Load before the page events, use the Page_PreRender

protected void Page_PreRender(object sender, EventArgs e)

in the actual page.

Answer 3

You are going to have to check whether the user is logged in for those features, by doing: if (this.Page.User.Identity.IsAuthenticated == true) { .. } . Nothing can be assumed, which is what you are experiencing. You could also move your login check to Page_Init, or even move it to an HTTP module that runs on every page load; there you have access to a wide array of events including application authentication/authorization.

If you are using forms authentication, you can use the configuration file to drive this instead, via the authorization element.

<system.web>
  <authorization>
    <deny users="?" />
    <allow users="*" />
  </authorization>
</system.web>
<location path="login.aspx">
  <system.web>
    <authorization>
      <allow users="*" />
    </authorization>
  </system.web>
</location>

HTH.