ASP.NET - Web Pages

A simple ASP.NET page looks just like an ordinary HTML page.

Hello W3Schools

To start learning ASP.NET, we will construct a very simple HTML page that will display "Hello W3Schools" in an Internet browser like this:

Hello W3Schools!

 

 

Hello W3Schools in HTML

This code displays the example as an HTML page:

<html>
            <body bgcolor="yellow">
            <center>
            <h2>Hello W3Schools!</h2>
            </center>
            </body>
            </html>

Hello W3Schools in ASP.NET

The simplest way to convert an HTML page into an ASP.NET page is to copy the HTML file to a new file with an .aspx extension.

This code displays our example as an ASP.NET page:

<html>
            <body bgcolor="yellow">
            <center>
            <h2>Hello W3Schools!</h2>
            </center>
            </body>
            </html>

 

How Does it Work?

Fundamentally//从根本上来讲 an ASP.NET page is just the same as an HTML page.

An HTML page has the extension .htm. If a browser requests an HTML page from the server, the server sends the page to the browser without any modifications//改动.

An ASP.NET page has the extension .aspx. If a browser requests an ASP.NET page, the server processes//产生 any executable code//可执行代码 in the page, before the result is sent back to the browser.

The ASP.NET page above does not contain any executable code, so nothing is executed. In the next examples we will add some executable code to the page to demonstrate//示范,演示 the difference between static HTML pages and dynamic ASP pages.

Classic ASP

Active Server Pages (ASP) has been around for several years. With ASP, executable code can be placed inside HTML pages.

Previous versions of ASP (before ASP .NET) are often called Classic ASP.

ASP .NET is not fully compatible with Classic ASP, but most Classic ASP pages will work fine as ASP .NET pages, with only minor changes.

Dynamic Page in Classic ASP

To demonstrate how ASP can display pages with dynamic content, we have added some executable code//可执行代码 (in red) to the previous example:

<html>
            <body bgcolor="yellow">
            <center>
            <h2>Hello W3Schools!</h2>
            <p><%Response.Write(now())%></p>
            </center>
            </body>
            </html>

The code inside the <% --%> tags is executed on the server//服务器.

Response.Write is ASP code for writing something//写入数据to the HTML output stream//输出流.

Now() is a function returning the servers//服务器 current date and time.

Dynamic Page in ASP .NET

This following code displays our example as an ASP .NET page:

<html>
            <body bgcolor="yellow">
            <center>
            <h2>Hello W3Schools!</h2>
            <p><%Response.Write(now())%></p>
            </center>
            </body>
            </html>

 

ASP .NET vs Classic ASP

The previous examples didn't demonstrate//演示 any differences between ASP .NET and Classic ASP.

As you can see from the two latest examples there are no differences between the two ASP and ASP .NET pages.

In the next chapters you will see how server controls make ASP. NET more powerful  than Classic ASP.

posted on 2007-01-15 15:55  改变热爱  阅读(252)  评论(0)    收藏  举报

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