Enterprise Library 2.0 Hands On Lab 翻译(11):缓存应用程序块(三)
练习3:实现后台缓存
该练习将示范如何实现后台加载。
第一步
打开EmployeeBrowser.sln 项目,默认的安装路径应该为C:\Program Files\Microsoft Enterprise Library January 2006\labs\cs\Caching\exercises\ex03\begin,并编译。
第二步 实现后台加载
1.在解决方案管理器中选择EmployeeServices.cs文件,选择View | Code菜单命令,添加如下两个方法,它们将实现在后台加载缓存。
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BeginBackgroundLoad方法使用一个委托在后台线程开始PopulateCache方法,它将会被.NET工作线程处理。
2.选择MainForm.cs文件,选择View | Code菜单命令,在方法MainForm_Load中加入如下代码开始后台工作。
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第三步 运行应用程序
1.选择Debug | Start Without Debugging菜单命令运行应用程序。
不要浏览任何雇员数据,在等待大概10秒后退出应用程序。如果应用程序在线它将尝试后台加载雇员照片,缓存存储在物理存储位置上,即持久缓存,但是与前一个练习使用了不同的PartitionName。
2.在解决方案管理器中选择ConnectionManager.cs,选择View | Code菜单命令,在下面的代码中修改IsOnline属性的值。
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3.选择Debug | Start Without Debugging菜单命令运行应用程序。现在应用程序不再连接数据库处于离线状态,所有的雇员信息已经照片已经被缓存。
更多Enterprise Library的文章请参考《Enterprise Library系列文章》
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