public static Action ExcuteUntilExitOrCancellation(
CancellationToken aCancellationToken,
ShellParameters aShellParameters,
Action <string> aActOnProcessOutput)
{
return(() =>
{
using (Process lBackgroundProcess = BackgroundProcesses.SetBackgroundProcessRunning(aShellParameters))
{
// Start a task to read all of STDOUT from the background process. The process will exit
// if and when the process closes STDOUT and this task reads it to the end.
Task <string> lReadingStdout = lBackgroundProcess.StandardOutput.ReadToEndAsync();
// Wait on the task. If the task is cancelled, an OperationCanceledException will be raised.
// If the task is cancelled, the background process probably hasn't exited, so try to kill it,
// else it won't exit.
try
{
lReadingStdout.Wait(aCancellationToken);
}
catch (System.OperationCanceledException)
{
BackgroundProcesses.AttemptToKill(lBackgroundProcess);
}
aActOnProcessOutput(lReadingStdout.Result);
}
});
}
public static Process SetBackgroundProcessRunning(ShellParameters aParameters)
{
Process lProcess = new System.Diagnostics.Process();
lProcess.StartInfo.WorkingDirectory = Path.GetTempPath();
lProcess.StartInfo.UseShellExecute = false;
lProcess.StartInfo.FileName = aParameters.Executable;
lProcess.StartInfo.RedirectStandardInput = true;
lProcess.StartInfo.RedirectStandardOutput = true;
lProcess.StartInfo.CreateNoWindow = true;
if (aParameters.Arguments != null && aParameters.Arguments.Length > 0)
{
lProcess.StartInfo.Arguments = aParameters.Arguments;
}
lProcess.Start();
lProcess.StandardInput.WriteLine(aParameters.StandardInput);
lProcess.StandardInput.Close();
return(lProcess);
}