Share ASP.NET study notes (5) Global page AppStart and PageStart

This chapter introduces the global pages AppStart and PageStart.

Before the Web starts: _AppStart

Most of the server-side code is written in the personal web page. For example, if a web page contains an input form, the web page usually contains server-side code that reads the form data.

However, you can start code execution before the site starts by creating a page called _AppStart in the root of your site. If this page exists,ASP.NET will run this page first when other pages in the site are requested. Typical uses for

_AppStart are to start code and initialize global values (such as counters and global names).

Note 1: The file extension of _AppStart is consistent with your web page, such as: _AppStart.cshtml.

Note 2: _AppStart has an underscore prefix. Therefore, these files cannot be browsed directly.

Before every page: _PageStart

Just like _AppStart runs before your site starts, you can write code that runs before any page in each folder.

For each folder in your website, you can add a file named _PageStart.

How does it work?

The following diagram shows how it works:

When receiving a request, ASP.NET will first check whether _AppStart exists. If _AppStart exists and this is the first request received by the site, _AppStart is run.

Then ASP.NET checks whether _PageStart exists. If _PageStart exists, _PageStart is run before other requested pages.

You can call RunPage() in _PageStart to specify the running location of the requested page. Otherwise, by default, the requested page is run after _PageStart is run.

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