检查进程是否在c＃中为null？ [英] check process if null in c# ?

问题描述

你好所有

请我尝试使用此代码在c＃windows应用程序中运行进程

hello all
please i try to use this code to run process in c# windows application

Process p = Process.Start(@"C:\Program Files\TeamViewer\Version7\TeamViewer", "-i 10.57.171.132 --Password P@ssw0rd");
            Thread.Sleep(500); // Allow the process to open it's window
            SetParent(p.MainWindowHandle, this.Handle);

但是如果Process P找不到我需要它的程序走另一条道路..

问题是我无法检查p是否为空，如果找不到正确的路径代码停止运行

？

help please：）

but if Process P doesnt find the program i need it to go another path ..
the problem is i cant check if p is null , the code stop running if not found the correct path
?
help please :)

推荐答案

如果没有进程已经启动，无论出于何种原因，这个调用确实返回null（你还能期待什么？:-)：< a href =http://msdn.microsoft.com/en-us/library/vstudio/h6ak8zt5> http://msdn.microsoft.com/en-us/library/vstudio/h6ak8zt5 [< a href =http://msdn.microsoft.com/en-us/library/vstudio/h6ak8zt5target =_ blanktitle =New Window> ^ ]。



那么，有什么问题，检查 if（p == null）... ？什么都没有停止运行。



（这个帖子的答案，不是问题;一切都很清楚。）

-SA

If no process has started, by whatever reason, this call really returns null (what else would you expect? :-): http://msdn.microsoft.com/en-us/library/vstudio/h6ak8zt5[^].

So, what's the problem, to check "if (p == null) …"? Nothing "stops running".

(This post the answer, not a question; everything is clear.)

—SA

也许你可以先检查是否存在可执行文件，然后继续处理。

见这里 File.Exists [ ^ ]

maybe you can first check the existence of executable, then continue with process.
see here File.Exists[^]

string fullPath = @"full_exe_path"; // fullPath may change according to your design. like a parameter for a method, or a property of a helper class, or a constant value coming from an external configuration file.
if(File.Exists(fullPath)) {
  var p = Process.Start(fullPath);
  // ...
}

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