前幾天MS的ASP.NET小組推出了一個小組件：Sprite and Image Optimization Framework，用於生成Sprite CSS，及將小的圖片生成一副大圖。
下載地址：http://aspnet.codeplex.com/releases/view/50140
下載後工程中有一個類庫，一個ASP.NET WebForm示例以及一個ASP.NET MVC示例。
下面我們就看看ASP.NET MVC的示例
圖中所標記的圖片都是來源於一個整張的圖片
~\App_Sprites\categories\sprite0.png
~\App_Sprites\popular\sprite0.png
而這個整張圖片則是由Sprite and Image Optimization Framework自動以幾個小圖片合併並生成類似下面的CSS
.popular_azureLogo-png { width:32px; height:30px; background-image:url(sprite0.png); background-position:-0px 0; }我們下面看看我們怎麼在程序中使用這個工具吧
1.在程序中建立一個名爲App_Sprites的文件夾在其中建立子目錄每一個子目錄中的圖片文件將會自動合併成一個大文件，並且生成CSS
圖中
框中的文件爲小的圖片文件
sprite0.png爲自動生成後的大圖片、highCompat.css/lowCompat.css爲自動生成的CSS文件
注：這兩個CSS文件暫沒有不同，但未來lowCompat.css可能只支持IE7-9、FF的主流瀏覽器，highCompat將支持其它
settings.xml爲配置文件：
<?xml version="1.0" encoding="utf-8"?> <ImageOptimizationSettings> <FileFormat>png</FileFormat> <Base64Encoding>false</Base64Encoding> <Quality>80</Quality> <BackgroundColor>00000000</BackgroundColor> <MaxSize>500</MaxSize> </ImageOptimizationSettings>其中
FileFormat爲大圖片類型
Based64Encoding爲圖片地址是否使用Base64編碼，如果使用則生成的CSS可能如下：
.categories_azureLogo-png { width:16px; height:16px; background: url(data:image/png;base64,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) no-repeat 0% 0%; }Quality爲生成圖片質量
BackgroundColor爲背景色，默認透明
MaxSize爲最大圖片大小
2.如何讓這這些文件自動生成的這個其中是靠添加Modules來完成的，也就是首次訪問頁面時就會自動生成大圖片以及CSS
在System.Web節點上添加
<httpModules><add type ="Microsoft.Samples.Web.ImageOptimizationModule" name ="Microsoft.Samples.Web.ImageOptimizationModule"/>
</httpModules>
或IIS7以上在System.WebServer節點上添加
<modules runAllManagedModulesForAllRequests="true"><add type="Microsoft.Samples.Web.ImageOptimizationModule" name ="Microsoft.Samples.Web.ImageOptimizationModule"/>
</modules>
都可以達到效果
3.如何使用這個分兩步走
第一，引用生成的CSS
<%: Microsoft.Samples.Web.ImageSprite.ImportStylesheet("~/App_Sprites/categories/") %> <%: Microsoft.Samples.Web.ImageSprite.ImportStylesheet("~/App_Sprites/popular/") %>指定到相應的文件夾就OK了
最終會根據訪問者的瀏覽器，生成
<link href="App_Sprites/categories/lowCompat.css" media="all" rel="stylesheet" type="text/css" /> <link href="App_Sprites/popular/lowCompat.css" media="all" rel="stylesheet" type="text/css" />或使用highCompat.css的link標籤
第二，如何使用某生圖片
如果要用img標籤的話
<%: Microsoft.Samples.Web.ImageSprite.Image("~/App_Sprites/popular/windowsLogo.png" ) %>類似這樣去用就可以了，會生成類似下面的標籤
<img class="popular_mesh-png" src="data:image/gif;base64,R0lGODlhAQABAIABAP///wAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" />如果要直接使用CSS去引用，則可以使用指定的Class來規定Sprite的背景圖片
<div class="categories_windowsLogo-png">windows</div>則會在此標籤的背景上顯示大圖片，並自動設定到要顯示小圖片的位移。
categories_windowsLogo-png則表示要顯示~/APP_Sprites/categories/windowsLogo.png
附原圖一張
