Month: April 2019

Execute a bash script via C#/.NET Core

jack4it2 Comments

With .NET Core now being a cross-platform framework, it’s very easy to invoke a Bash script from C# codes. It’s not a common practice, but in cases that are lack of a .NET library or REST/rpc API, being able to run a script out-of-process is valuable. So here is a nice extension method that I wrote and found it a joy to call.

public static class ShellHelper
{
public static Task<int> Bash(this string cmd, ILogger logger)
{
var source = new TaskCompletionSource<int>();
var escapedArgs = cmd.Replace("\"", "\\\"");
var process = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = "bash",
Arguments = $"-c \"{escapedArgs}\"",
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
CreateNoWindow = true
},
EnableRaisingEvents = true
};
process.Exited += (sender, args) =>
{
logger.LogWarning(process.StandardError.ReadToEnd());
logger.LogInformation(process.StandardOutput.ReadToEnd());
if (process.ExitCode == 0)
{
source.SetResult(0);
}
else
{
source.SetException(new Exception($"Command `{cmd}` failed with exit code `{process.ExitCode}`"));
}
process.Dispose();
};
try
{
process.Start();
}
catch (Exception e)
{
logger.LogError(e, "Command {} failed", cmd);
source.SetException(e);
}
return source.Task;
}
}
view raw bash_helper.cs hosted with ❤ by GitHub

To call the method, one can simply do, e.g.:

await $"scripts/00magic.sh --param {arg}".Bash(this.logger);
view raw bash_helper_call.cs hosted with ❤ by GitHub
Execute a bash script via C#/.NET Core