我试图通过单击按钮使我的所有代码都在后台工作程序中运行。所以我有以下代码模板。
BackgroundWorker backgroundWorker = new BackgroundWorker();
backgroundWorker.DoWork += delegate
{
//code
};
backgroundWorker.RunWorkerAsync();
while (backgroundWorker.IsBusy)
{
Application.DoEvents();
}
只想知道是否有一种方法可以简化此代码,所以我没有为所有按钮有效地复制相同的代码块。
编辑:
我尝试运行的典型代码大致如下:
//Synchronous task
Wait(2000);
//Synchronous task
return taskResult ? "Success" : "Failure"
最佳答案
没有更多的背景信息,就不可能提出非常具体的改进建议。也就是说,可以肯定地摆脱了while
循环。只需使用:
BackgroundWorker backgroundWorker = new BackgroundWorker();
backgroundWorker.DoWork += delegate
{
//code
};
backgroundWorker.RunWorkerAsync();
请注意,如果您有要在
BackgroundWorker
任务完成时执行的代码(可能首先解释了为什么while
循环的原因),则类似的事情将起作用(而不是使用while
循环)您之前有过):BackgroundWorker backgroundWorker = new BackgroundWorker();
backgroundWorker.DoWork += delegate
{
//code
};
backgroundWorker.RunWorkerCompleted += (sender, e) =>
{
// code to execute when background task is done
};
backgroundWorker.RunWorkerAsync();
在现代C#中,
BackgroundWorker
几乎已过时。它现在提供的主要好处是方便的进度报告,实际上可以很容易地通过使用Progress<T>
来获得。如果不需要报告进度,则将代码分解为使用
async
/ await
很容易:await Task.Run(() =>
{
//code
});
// code to execute when background task is done
如果您确实需要报告进度,则只会稍微困难一点:
Progress<int> progress = new Progress<int>();
progress.ProgressChanged += (sender, progressValue) =>
{
// do something with "progressValue" here
};
await Task.Run(() =>
{
//code
// When reporting progress ("progressValue" is some hypothetical
// variable containing the progress value to report...Progress<T>
// is generic so you can customize to do whatever you want)
progress.Report(progressValue);
});
// code to execute when background task is done
最后,在某些情况下,您可能需要任务返回一个值。在这种情况下,它将看起来像这样:
var result = await Task.Run(() =>
{
//code
// "someValue" would be a variable or expression having the value you
// want to return. It can be of any type.
return someValue;
});
// At this point in execution "result" now has the value returned by the
// background task. Note that in the above example, the method itself
// is anonymous and so you could just set a local variable at the end of the
// task; the value-returning syntax is more useful when you are calling an
// actual method that itself returns a value, and is especially useful when
// you are calling an `async` method that returns a value (i.e. you're not
// even using `Task.Run()` in the `await` statement.
// code to execute when background task is done
您可以根据需要混合和匹配上述技术。
关于c# - 简化后台工作人员的匿名方法,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/28922074/