How Can I Determine if a Specific Process is Running in C#?

Check the process running status

The Process class in the System.Diagnostics namespace represents a running process. It provides a variety of process operation methods, including querying process status. When accessing a Process reference, it is critical to determine whether it is running.

Use ProcessName method

One way to check the status of a process is to use the GetProcessesByName method:

<code class="language-csharp">Process[] pname = Process.GetProcessesByName("notepad");
if (pname.Length == 0)
  MessageBox.Show("未运行");
else
  MessageBox.Show("正在运行");</code>

This code retrieves all processes with a specified name (e.g., "notepad"). If the length of the result array is zero, it means that no process of that name is running; otherwise, it means that there is currently a process running.

Traverse the process

Another way is to loop through all running processes and check their IDs:

<code class="language-csharp">Process[] processlist = Process.GetProcesses();
foreach(Process theprocess in processlist){
   Console.WriteLine("进程：{0}，ID：{1}", theprocess.ProcessName, theprocess.Id);
}</code>

This method iterates over all active processes, displaying their names and IDs. It provides a more comprehensive view of running system processes.

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