ASP.NET AJAX入门系列（1）：概述
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。
下篇预告：ASP.NET AJAX入门系列（2）：使用ScriptManager
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作者：TerryLee
出处：http://terrylee.cnblogs.com
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