精通ASP.NET 4.5：从入门到实战

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"Apress.Pro.ASP.NET.4.5.in.C#.5th.Edition"是一本深入讲解ASP.NET 4.5在C#中的应用的专业书籍，涵盖了1228页的内容，于2013年7月10日发布，由Apress出版社出版，适合英语读者。本书第五版强调了ASP.NET 4.5的革新特性，如Web API的使用和集成，以及Entity Framework在Web应用程序中的数据绑定。学习者将从头开始，理解ASP.NET 4.5的核心原则和基础概念，包括Visual Studio的运用，掌握如何创建和整合ASP.NET控件于页面中，从而构建完整的应用程序。书中特别关注了Web API这一新增功能，指导读者如何有效利用它并融入现有项目。此外，读者还将学习到实体框架（Entity Framework）的深层次操作，包括如何进行数据绑定，以及如何确保应用程序的安全性。书中详尽探讨了高级用户界面技术，涉及用户控制、服务器控件、自定义控件以及客户端JavaScript的使用，使读者能跟上当代Web开发的潮流。书中还包含了一个实际的体育商店应用程序示例，通过一步步的教学，帮助读者从创建初始应用到部署和测试，全面展示了ASP.NET平台的各个方面。从基础的Web Forms工作原理，到页面和控件生命周期事件的管理，再到模块和处理器的使用，每一章都深入浅出地剖析了核心概念。这本书不仅提供了丰富的理论知识，还提供了实践操作的案例，对于想要提升ASP.NET 4.5和C#技能的开发者来说，是不可或缺的参考资料。无论是初次接触该技术的初学者，还是希望更新技能的中级开发者，都能从中获益匪浅。

CHAPTER 1 ■ YOUR FIRST ASP.NET APPLICATION

We have changed the id attribute value of the form element and added some standard HTML elements to display

information about the party and gather the RSVP details from the users. You can see how changes appear by starting

the application (either select Start Debugging from the Debug menu or click the Internet Explorer button on the

toolbar). As you can see in Figure 1-7, we have a form but it doesn’t look very nice.

Figure 1-7. The effect of adding to the form element in the Default.aspx file

We style elements in a Web Form in the same way we would a regular HTML page—by using Cascading Style

Sheets (CSS). To add some basic styles to the application, right-click on the PartyInvites item in the Solution Explorer

and select Add ➤ Style Sheet from the pop-up menu. Set the name to be PartyStyles and click the OK button. Visual

Studio will add a new PartyStyles.css file to the project. Set the contents of this new file to match the CSS shown

in Listing 1-7. Although these are very basic CSS styles, they will improve the appearance of our form fields.

Listing 1-7. The CSS styles defined in the PartyStyles.css file

#rsvpform label { width: 120px; display: inline-block;}

#rsvpform input { margin: 2px; margin-left: 4px; width: 150px;}

#rsvpform select { margin: 2px 0; width: 154px;}

button[type=submit] { margin-top: 5px;}

We associate a CSS style sheet with a Web Form using a link element. You can see how we have added such

an element to the head section of the Default.aspx file in Listing 1-8.

Tip ■ If you are unfamiliar with the standards and technologies that underpin web content, such as HTML, CSS, and

basic JavaScript, we suggest that you consult Adam’s book The Definitive Guide to HTML5, which is also published by

Apress and which is a comprehensive reference.

CHAPTER 1 ■ YOUR FIRST ASP.NET APPLICATION

For our example, the Page_Load method will be called once when the page is first loaded and once again when

the user submits the form. (We will explain why this happens in Part 2.) In Listing 1-10, you can see the code we have

added to the Page_Load method to respond to requests.

Listing 1-10. Adding code to the Page_Load method

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.ModelBinding;

namespace PartyInvites {

public partial class Default : System.Web.UI.Page {

protected void Page_Load(object sender, EventArgs e) {

if (IsPostBack) {

GuestResponse rsvp = new GuestResponse();

if (TryUpdateModel(rsvp,

new FormValueProvider(ModelBindingExecutionContext))) {

ResponseRepository.GetRepository().AddResponse(rsvp);

if (rsvp.WillAttend.HasValue && rsvp.WillAttend.Value) {

Response.Redirect("seeyouthere.html");

} else {

Response.Redirect("sorryyoucantcome.html");

}

We determine if the request we are responding to is the form being posted back to the server by checking the

IsPostBack property. If it is, we create a new instance of the GuestResponse data model object and pass it to the

TryUpdateModel method, which is inherited from the base Page class.

The TryUpdateModel method performs a process called model binding where data values are used

from the browser request to populate the properties of our data model object. The other argument to the

TryUpdateModel method is the object that ASP.NET should use to obtain the values it needs—we have used the

System.Web.ModelBinding.FormValueProvider class, which provides values from form data. We describe model

binding in more depth in Part 3, but the result of calling the TryUpdateModel method is that the properties of our

GuestResponse object are updated to reflect the data values that the user submitted in the form. We then store the

GuestResponse object in our repository.

We want to give the user some kind of feedback when this user submits the form and we do this by using the

Response.Redirect method, which redirects the user’s browser. If the WillAttend property is true, then the user is

coming to the party and we redirect him or her to the seeyouthere.html file. Otherwise, we redirect the user to the

sorryyoucantcome.html file.

CHAPTER 1 ■ YOUR FIRST ASP.NET APPLICATION

Creating the HTML Response Files

Not all of the pages in an ASP.NET application have to be generated from Web Form files. We can also include regular,

static HTML files. To create the first response file, right-click the PartyInvites item in the Solution Explorer and

select Add ➤ New Item from the pop-up menu. Select the HTML Page template from the Add New Item dialog and set

the name to seeyouthere.html. Finally, click the Add button to create the HTML file. Ensure that the contents of the

file match the contents in Listing 1-11.

Listing 1-11. The contents of the seeyouthere.html file

<!DOCTYPE html>

<head>

<title>See you there!</title>

</head>

<body>

<h1>See you there!</h1>

<p>Come around 9pm. Fancy dress is optional</p>

</body>

</html>

Repeat the process to create the sorryyoucantcome.html file and set the contents to match the contents

in Listing 1-12.

Listing 1-12. The contents of the sorryyoucantcome.html file

<!DOCTYPE html>

<head>

</head>

<body>

<h1>Sorry you can't come!</h1>

<p>It won't be the same without you. Maybe next year.</p>

</body>

</html>

Bringing the HTML Elements into Scope

We almost have the basic structure of our application in place, but things are not quite working. We need to tell Visual

Studio which file should be loaded when we start the application. It didn’t matter earlier because there was only the

Default.aspx file and Visual Studio is smart enough to figure out that this is the file that we want. But now we have a

couple of HTML files as well and we need to give Visual Studio a helping hand. Right-click on the Default.aspx entry

in the Solution Explorer and select Set as Start Page from the pop-up menu.

Now you can start the application, either by selecting Start Debugging from the Debug menu or by clicking

the Internet Explorer toolbar button. Fill out the form and ensure that you select the Yes option from the select

element. When you submit the form, you will see the response that should only be shown when you select the No

option, as illustrated in Figure 1-10. Clearly, something is amiss.

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