如何使用C# 捕获进程输出

 using var executor = new ProcessExecutor("dotnet", "nuget locals global-packages -l"); var folder = string.Empty; executor.OnOutputDataReceived += (sender, str) => { if(str is null) return; Console.WriteLine(str); if(str.StartsWith("global-packages:")) { folder = str.Substring("global-packages:".Length).Trim(); } }; executor.Execute(); Console.WriteLine(folder);

 public class ProcessExecutor : IDisposable { public event EventHandler OnExited; public event EventHandler OnOutputDataReceived; public event EventHandler OnErrorDataReceived; protected readonly Process _process; protected bool _started; public ProcessExecutor(string exePath) : this(new ProcessStartInfo(exePath)) { } public ProcessExecutor(string exePath, string arguments) : this(new ProcessStartInfo(exePath, arguments)) { } public ProcessExecutor(ProcessStartInfo startInfo) { _process = new Process() { StartInfo = startInfo, EnableRaisingEvents = true, }; _process.StartInfo.UseShellExecute = false; _process.StartInfo.CreateNoWindow = true; _process.StartInfo.RedirectStandardOutput = true; _process.StartInfo.RedirectStandardInput = true; _process.StartInfo.RedirectStandardError = true; } protected virtual void InitializeEvents() { _process.OutputDataReceived += (sender, args) => { if (args.Data != null) { OnOutputDataReceived?.Invoke(sender, args.Data); } }; _process.ErrorDataReceived += (sender, args) => { if (args.Data != null) { OnErrorDataReceived?.Invoke(sender, args.Data); } }; _process.Exited += (sender, args) => { if (sender is Process process) { OnExited?.Invoke(sender, process.ExitCode); } else { OnExited?.Invoke(sender, _process.ExitCode); } }; } protected virtual void Start() { if (_started) { return; } _started = true; _process.Start(); _process.BeginOutputReadLine(); _process.BeginErrorReadLine(); _process.WaitForExit(); } public async virtual Task SendInput(string input) { try { await _process.StandardInput.WriteAsync(input!); } catch (Exception e) { OnErrorDataReceived?.Invoke(_process, e.ToString()); } } public virtual int Execute() { InitializeEvents(); Start(); return _process.ExitCode; } public virtual async Task ExecuteAsync() { InitializeEvents(); return await Task.Run(() => { Start(); return _process.ExitCode; }).ConfigureAwait(false); } public virtual void Dispose() { _process.Dispose(); OnExited = null; OnOutputDataReceived = null; OnErrorDataReceived = null; } }

 [Fact] public void HostNameTest() { if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) { return; } var result = CommandRunner.ExecuteAndCapture("hostname"); var hostName = Dns.GetHostName(); Assert.Equal(hostName, result.StandardOut.TrimEnd()); Assert.Equal(0, result.ExitCode); }

 public static class CommandRunner { public static int Execute(string commandPath, string arguments = null, string workingDirectory = null) { using var process = new Process() { StartInfo = new ProcessStartInfo(commandPath, arguments ?? string.Empty) { UseShellExecute = false, CreateNoWindow = true, WorkingDirectory = workingDirectory ?? Environment.CurrentDirectory } }; process.Start(); process.WaitForExit(); return process.ExitCode; } public static CommandResult ExecuteAndCapture(string commandPath, string arguments = null, string workingDirectory = null) { using var process = new Process() { StartInfo = new ProcessStartInfo(commandPath, arguments ?? string.Empty) { UseShellExecute = false, CreateNoWindow = true, RedirectStandardOutput = true, RedirectStandardError = true, WorkingDirectory = workingDirectory ?? Environment.CurrentDirectory } }; process.Start(); var standardOut = process.StandardOutput.ReadToEnd(); var standardError = process.StandardError.ReadToEnd(); process.WaitForExit(); return new CommandResult(process.ExitCode, standardOut, standardError); } } public sealed class CommandResult { public CommandResult(int exitCode, string standardOut, string standardError) { ExitCode = exitCode; StandardOut = standardOut; StandardError = standardError; } public string StandardOut { get; } public string StandardError { get; } public int ExitCode { get; } }