ASP.NET AJAX入门系列（1）：概述

经常关注我的Blog的朋友可能注意到了，在我Blog的左边系列文章中，已经移除了对Atlas学习手记系列文章的推荐，因为随着ASP.NET AJAX 1.0 Beta版的发布，它们已经不再适用，为了不继续误导广大朋友，所以不再作为推荐系列文章，如果有需要参考的朋友，可以直接到随笔分类中查看。

　　ASP.NET AJAX Beta改动如此之大，鉴于又没有很好的中文参考资料，所以决定最近开始写作ASP.NET AJAX入门系列，这个系列我会把ASP.NET AJAX当作一个全新的东西去对待，不再考虑以前的Atlas，把自己对ASP.NET AJAX的研究与大家分享，便于初学的朋友少走一些弯路。对Atlas熟悉的朋友可以推荐看Dflying Chen的《拥抱变化——从Atlas到ASP.NET AJAX系列》，以及老赵的《深入Atlas系列》。由于个人的能力和掌握的程度有限 ，难免出现错误和遗漏的地方，还请大家多多理解和指正。

　　OK，让我们从这里开始！

　　一．ASP.NET AJAX组成部分

　　在ASP.NET AJAX官方网站上有如下三个下载：

　　1．ASP.NET AJAX：这部分是ASP.NET AJAX的核心部分，包括了核心AJAX类型系统，网络协议层(networking stack)，组件模型，扩展器(extender)基类，以及与ASP.NET集成的服务器端功能(包括广受欢迎的ScriptManager，UpdatePanel，和 Timer控件)。功能列表如下：

服务端功能列表 Asynchronous client-to-server networking Authentication as a Web service ControlExtender class Profile as a Web service ScriptManager and ScriptManagerProxy controls Static page methods as Web services Timer control UpdatePanel control UpdateProgress control 客户端功能列表 Authentication for JavaScript Behavior class Calling .asmx Web services from JavaScript Component class Control class Debug class JavaScript Array type extensions JavaScript Boolean type extensions JavaScript Error type extensions JavaScript Number type extensions JavaScript Object type extensions JavaScript String type extensions JSON serialization Profile for JavaScript Trace class

　　2．ASP.NET AJAX “Value-Add”CTP：ASP.NET AJAX社区支持的“增值”CTP部分，包括了以前各个Atlas CTP版本包含的，但并不在完全支持的“核心”1.0 版本内的额外的高级特性。通过进一步的反馈，这些将会逐步稳定的增加到核心1.0中去。功能列表如下：

服务端功能列表 AutoCompleteExtender class Cross-browser Web Parts drag-and-drop DragOverlayExtender control PopupExtender class 客户端功能列表 Actions components AutoCompleteBehavior class BatchResponse class Binding component Button control Checkbox control Click behavior Counter class Cross-browser Web Parts Data control DragDropList control DragDropManager component DraggableListItem control FadeAnimation component

 

　　Floating behavior

Hover behavior Hyperlink control Image control Input control Label control Layout behavior Opacity behavior Popup behavior Selector control ServiceMethodRequest class Sys.Data and Sys.UI.Data namespaces Textbox control Timer control Validator controls xml-script support

　　3．ASP.NET AJAX Control Toolkit：包含了基于ASP.NET AJAX 1.0 版“核心”下载版本的28个非常酷的免费AJAX控件。它是一个开源项目，由微软和非微软开发人员共同开发的，去CodePlex下载代码。

　　二．安装ASP.NET AJAX

　　1．在安装ASP.NET AJAX 1.0 Beta之前，需要先卸载以前所有的CTP版本。

　　2．下载ASP.NET AJAX 1.0 Beta安装包，安装时Microsoft.Web.Extensions.dll程序集将被安装在GAC（Global Assembly Cache）中，所以使用时不需要再在Web站点的Bin文件夹中包括该程序集。

　　3．下载安装ASP.NET AJAX “Value-Add”CTP和ASP.NET AJAX Control Toolkit。列表如下：

名称 描述 Accordion: Create efficient UI from multiple panes with this animated control. AlwaysVisibleControl Docks a panel to a corner of the browser window and keeps it visible even when the user scrolls. Animation Adds powerful, easy to use animations to any element or control. CascadingDropDown Easily link drop downs, complete with asynchronous population and no postbacks! CollapsiblePanel This extender allows panels on your page to collapse and expand with no code. ConfirmButton This extender adds a confirm dialog to any Button, LinkButton, or ImageButton control. DragPanel Makes any panel into an object that you can drag around the page. DropDown This extender can wrap any control to provide a SharePoint-style drop-down menu that is attached to the control. DropShadow This extender adds attractive drop shadows to any control on the page DynamicPopulate Replace the contents of a page element with the result of a web-service call. FilteredTextBox Restrict the types of input that text boxes will accept. HoverMenu Allows UI to pop up next to a control when the mouse hovers over it. ModalPopup Allows you to show styled modal UI without using HTML dialogs. MutuallyExlcusiveCheckBox By adding a number of checkboxes to the same “Key”, only one checkbox with the specified key can be checked at a time. NoBot Applies simple rules to prevent automated bots or scripts from posting to a page. NumericUpDown Allow users to easily increase and decrease values using the mouse to scroll through values. PagingBulletedList Add paging and sorting to long bulleted lists. PasswordStrength Give your users visual cues to help them create secure passwords. PopupControl This extender turns any panel into a popup. Rating Let your users easily give feedback by rating content with this easy-to-use control. ReorderList This control is a full-featured data-bound control that allows its elements to be reordered on the client via drag and drop. ResizableControl Allow users to dynamically resize content, right in the browser RoundedCorners Rounds the corners of any control for a clean, professional look! Slider Adds an elegant scrollbar-like user interface for setting numeric values. TextBoxWatermark This extender adds "watermark" prompt text to TextBoxes on the page. ToggleButton This extender turns an ASP.NET CheckBox into an image checkbox. UpdatePanelAnimation Animates page elements corresponding to hidden postback activity. ValidatorCallout This extender enhances the functionality of existing ASP.NET validators.

　　三．在Visual Studio.NET 2005开发基于ASP.NET AJAX的应用

　　安装完ASP.NET AJAX后，打开Visual Studio.NET 2005中新建Web Site，在项目模板中会出现一项ASP.NET AJAX-enabled Web site，直接选择它就可以了，如下图：

　　新建完成的项目中会自动在Web.config中做好相关的配置，并且AJAXExtensionToolbox.dll已经添加到了VS的工具箱中，不需要再手工添加。

　　概述篇简单的介绍这里，从下一篇开始学习ASP.NET AJAX中的每一项具体的功能。