ASP.NET Web Pages - Page Layout

A Consistent Look

On the Internet you will discover many web sites with a consistent look and feel:

• Every page have the same header
• Every page have the same footer
• Every page have the same style and layout

With Web Pages this can be done very efficiently. You can have reusable blocks of content (content blocks), like headers and footers, in separate files.

You can also define a consistent layout for all your pages, using a layout template (layout file).

Practice Excercise Practice now

Content Blocks

Many websites have content that is displayed on every page (like headers and footers).

With Web Pages you can use the @RenderPage() method to import content from separate files.

Content block (from another file) can be imported anywhere in a web page, and can contain text, markup, and code, just like any regular web page.

Using common headers and footers as an example, this saves you a lot of work. You don't have to write the same content in every page, and when you change the header or footer files, the content is updated in all your pages.

This is how it looks in code:

Example

Practice Excercise Practice now

Using A Layout Page

In the previous section, you saw that including the same content in many web pages is easy.

Another approach to creating a consistent look is to use a layout page. A layout page contains the structure, but not the content, of a web page. When a web page (content page) is linked to a layout page, it will be displayed according to the layout page (template).

The layout page is just like a normal web page, except from a call to the @RenderBody() method where the content page will be included.

Each content page must start with a Layout directive.

This is how it looks in code:

Layout Page:

Any Web Page:

Practice Excercise Practice now

D.R.Y. - Don't Repeat Yourself

With two ASP.NET tools, Content Blocks and Layout Pages, you can give your web applications a consistent look.

These tools also save you a lot of work, since you don't have to repeat the same information on all pages. Centralizing markup, style, and code makes web applications much more manageable and easier to maintain.

Practice Excercise Practice now

Preventing Files From Being Browsed

With ASP.NET, files with a name that starts with an underscore cannot be browsed from the web.

If you want to prevent your content blocks or layout files from being viewed by your users, rename the files to:

_header.cshtml

_footer.cshtml

_Layout.cshtml

Practice Excercise Practice now

Hiding Sensitive Information

With ASP.NET, the common way to hide sensitive information (database passwords, email passwords, etc.) is to keep the information in a separate file named "_AppStart".

_AppStart.cshtml

Practice Excercise Practice now