how to capture output for Process into a C# variable? [duplicate]

Question

I am running below command in windows command prompt and it's giving output like below,

C:\>logman.exe FabricTraces | findstr Root Root Path: C:\ProgramData\Windows Fabric\Fabric\log\Traces\

Now, I am trying to mimic the same in C# program and would like to capture the output (C:\ProgramData\Windows Fabric\Fabric\log\Traces\) into a variable.

How to do this, here's the code I tried,

Process P = Process.Start("logman.exe", "FabricTraces | findstr Root"); P.WaitForExit(); var result = P.ExitCode;

You have to start cmd with the /C option if you want to use pipes and other shell features. FabricTraces | findstr Root isn't the argument string of the process... — IS4
– IS4, Commented Nov 20, 2017 at 11:43

Avo Nappo · Accepted Answer · 2017-11-20 10:11:10Z

Something like this:

private void StartProcess() { System.Diagnostics.Process process = new System.Diagnostics.Process(); process.StartInfo.FileName = /* path + binary */; process.StartInfo.Arguments = /* arguments */; process.StartInfo.WorkingDirectory = /* working directory */; process.StartInfo.RedirectStandardOutput = true; process.StartInfo.RedirectStandardError = true; process.StartInfo.UseShellExecute = false; process.StartInfo.CreateNoWindow = true; process.OutputDataReceived += Process_OutputDataReceived; process.ErrorDataReceived += Process_ErrorDataReceived; process.Start(); process.BeginOutputReadLine(); process.BeginErrorReadLine(); process.WaitForExit(); } private void Process_ErrorDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e) { /* e.Data will contain string with error message */ } private void Process_OutputDataReceived(object sender, System.Diagnostics.DataReceivedEventArgs e) { /* e.Data will contain string with output */ }

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