Is there a way to detect if a debugger is attached to another process from C#?

Question

I have a program that Process.Start() another program, and it shuts it down after N seconds.

Sometimes I choose to attach a debugger to the started pro

Answer 1

Is the current process being debugged?

var isDebuggerAttached = System.Diagnostics.Debugger.IsAttached;

Is another process being debugged?

Process process = ...;
bool isDebuggerAttached;
if (!CheckRemoteDebuggerPresent(process.Handle, out isDebuggerAttached)
{
    // handle failure (throw / return / ...)
}
else
{
    // use isDebuggerAttached
}


/// 
Checks whether a process is being debugged.
/// 
/// The "remote" in CheckRemoteDebuggerPresent does not imply that the debugger
/// necessarily resides on a different computer; instead, it indicates that the 
/// debugger resides in a separate and parallel process.
/// 
/// Use the IsDebuggerPresent function to detect whether the calling process 
/// is running under the debugger.
/// 
[DllImport("Kernel32.dll", SetLastError=true, ExactSpelling=true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool CheckRemoteDebuggerPresent(
    SafeHandle hProcess,
    [MarshalAs(UnmanagedType.Bool)] ref bool isDebuggerPresent);

Within a Visual Studio extension

Process process = ...;
bool isDebuggerAttached = Dte.Debugger.DebuggedProcesses.Any(
    debuggee => debuggee.ProcessID == process.Id);