C# 如何启动低优先级的进程？C＃
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How do I launch a process with low priority? C#
提问by
I want to execute a command line tool to process data. It does not need to be blocking. I want it to be low priority. So I wrote the below
我想执行一个命令行工具来处理数据。它不需要阻塞。我希望它是低优先级的。所以我写了下面
Process app = new Process();
app.StartInfo.FileName = @"bin\convert.exe";
app.StartInfo.Arguments = TheArgs;
app.PriorityClass = ProcessPriorityClass.BelowNormal;
app.Start();
However, I get a System.InvalidOperationExceptionwith the message "No process is associated with this object." Why? How do I properly launch this app in low priority?
但是，我收到System.InvalidOperationException消息“没有进程与此对象关联”。为什么？如何以低优先级正确启动此应用程序？
Without the line app.PriorityClass = ProcessPriorityClass.BelowNormal;the app runs fine.
没有这条线app.PriorityClass = ProcessPriorityClass.BelowNormal;，应用程序运行良好。
采纳答案by Robert Harvey
Try setting the PriorityClass AFTER you start the process. Task Manager works this way, allowing you to set priority on a process that is already running.
尝试在开始该过程后设置 PriorityClass。任务管理器以这种方式工作，允许您为已经运行的进程设置优先级。
回答by Roger Lipscombe
If you're prepared to P/Invoke to CreateProcess, you can pass CREATE_SUSPENDEDin the flags. Then you can tweak the process priority before resuming the process.
如果您准备 P/Invoke to CreateProcess，则可以传入CREATE_SUSPENDED标志。然后您可以在恢复进程之前调整进程优先级。
回答by Pablo Montilla
You can create a process with lower priority by doing a little hack. You lower the parent process priority, create the new process and then revert back to the original process priority:
您可以通过一些小技巧创建一个优先级较低的进程。您降低父进程优先级，创建新进程，然后恢复到原始进程优先级：
var parent = Process.GetCurrentProcess();
var original = parent.PriorityClass;
parent.PriorityClass = ProcessPriorityClass.Idle;
var child = Process.Start("cmd.exe");
parent.PriorityClass = original;
childwill have the Idleprocess priority right at the start.
child将Idle在开始时拥有进程优先权。
