BackgroundWorker 类
来源:互联网 发布:mysql 自动增长 不好使 编辑:程序博客网 时间:2024/06/11 03:32
注意:此类在 .NET Framework 2.0 版中是新增的。
在单独的线程上执行操作。
命名空间:System.ComponentModel
程序集:System(在 system.dll 中)
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public class BackgroundWorker : Component
public ref class BackgroundWorker : public Component
备注
BackgroundWorker 类允许您在单独的专用线程上运行操作。耗时的操作(如下载和数据库事务)在长时间运行时可能会导致用户界面 (UI) 似乎处于停止响应状态。如果您需要能进行响应的用户界面,而且面临与这类操作相关的长时间延迟,则可以使用 BackgroundWorker 类方便地解决问题。
若要在后台执行耗时的操作,请创建一个 BackgroundWorker,侦听那些报告操作进度并在操作完成时发出信号的事件。可以通过编程方式创建 BackgroundWorker,也可以将它从“工具箱”的“组件”选项卡中拖到窗体上。如果在 Windows 窗体设计器中创建 BackgroundWorker,则它会出现在组件栏中,而且它的属性会显示在“属性”窗口中。
若要设置后台操作,请为 DoWork 事件添加一个事件处理程序。在此事件处理程序中调用耗时的操作。若要启动该操作,请调用 RunWorkerAsync。若要收到进度更新通知,请对 ProgressChanged 事件进行处理。若要在操作完成时收到通知,请对 RunWorkerCompleted 事件进行处理。
![Note](http://msdn2.microsoft.com/zh-cn/library/4852et58.note(zh-cn,VS.80).gif)
您必须非常小心,确保在 DoWork 事件处理程序中不操作任何用户界面对象。而应该通过 ProgressChanged 和 RunWorkerCompleted 事件与用户界面进行通信。
BackgroundWorker 事件不跨 AppDomain 边界进行封送处理。请不要使用 BackgroundWorker 组件在多个 AppDomain 中执行多线程操作。
如果后台操作需要参数,请在调用 RunWorkerAsync 时给出参数。在 DoWork 事件处理程序内部,可以从 DoWorkEventArgs.Argument 属性中提取该参数。
有关 BackgroundWorker 的更多信息,请参见 如何:在后台运行操作。
![Note](http://msdn2.microsoft.com/zh-cn/library/4852et58.note(zh-cn,VS.80).gif)
应用于此类的 HostProtectionAttribute 属性 (Attribute) 具有以下 Resources 属性 (Property) 值:SharedState。HostProtectionAttribute 不影响桌面应用程序(这些应用程序通常通过双击图标、键入命令或在浏览器中输入 URL 来启动)。有关更多信息,请参见 HostProtectionAttribute 类或 SQL Server 编程和宿主保护属性。
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下面的代码示例演示如何使用 BackgroundWorker 类异步执行耗时的操作。该操作计算选定的斐波纳契数,在计算过程中报告进度更新,并允许取消挂起的计算。
C#
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System.MarshalByRefObject
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System.ComponentModel.BackgroundWorker
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