Run git commands from a C# function

I realize this is an old question but I wanted to add the solution I recently came across to help those in the future.

The PowerShell class provides an easy way to interact with git. This is part of the System.Management.Automation namespace in .NET. Note that System.Management.Automation.dll is available via NuGet.

string directory = ""; // directory of the git repository

using (PowerShell powershell = PowerShell.Create()) {
    // this changes from the user folder that PowerShell starts up with to your git repository
    powershell.AddScript($"cd {directory}");

    powershell.AddScript(@"git init");
    powershell.AddScript(@"git add *");
    powershell.AddScript(@"git commit -m 'git commit from PowerShell in C#'");
    powershell.AddScript(@"git push");

    Collection<PSObject> results = powershell.Invoke();
}

In my opinion this is cleaner and nicer than using the Process.Start() approach. You can modify this to your specfic needs by editing the scripts that are added to the powershell object.

As commented by @ArtemIllarionov, powershell.Invoke() does not return errors but the Streams property has output information. Specifically powerShell.Streams.Error for errors.

If you want to do it in C#, you can call the external git command by Process.Start when you detect file change

string gitCommand = "git";
string gitAddArgument = @"add -A";
string gitCommitArgument = @"commit ""explanations_of_changes""";
string gitPushArgument = @"push our_remote";

Process.Start(gitCommand, gitAddArgument);
Process.Start(gitCommand, gitCommitArgument);
Process.Start(gitCommand, gitPushArgument);

Not the best solution but it works in C#

    //Console.WriteLine(CommandOutput("git status"));

    public static string CommandOutput(string command,
                                       string workingDirectory = null)
    {
        try
        {
            ProcessStartInfo procStartInfo = new ProcessStartInfo("cmd", "/c " + command);

            procStartInfo.RedirectStandardError = procStartInfo.RedirectStandardInput = procStartInfo.RedirectStandardOutput = true;
            procStartInfo.UseShellExecute = false;
            procStartInfo.CreateNoWindow = true;
            if (null != workingDirectory)
            {
                procStartInfo.WorkingDirectory = workingDirectory;
            }

            Process proc = new Process();
            proc.StartInfo = procStartInfo;
            proc.Start();

            StringBuilder sb = new StringBuilder();
            proc.OutputDataReceived += delegate (object sender, DataReceivedEventArgs e)
            {
                sb.AppendLine(e.Data);
            };
            proc.ErrorDataReceived += delegate (object sender, DataReceivedEventArgs e)
            {
                sb.AppendLine(e.Data);
            };

            proc.BeginOutputReadLine();
            proc.BeginErrorReadLine();
            proc.WaitForExit();
            return sb.ToString();
        }
        catch (Exception objException)
        {
            return $"Error in command: {command}, {objException.Message}";
        }
    }