OfficeTool/Services/ProcessRunner.cs

using System;
using System.Diagnostics;
using System.Text;
using System.Threading.Tasks;

namespace InstaSoftOfficeTool.Services
{
    public class ProcessRunner
    {
        public event Action<string> OutputReceived;

        public async Task<int> RunAsync(string fileName, string arguments, bool redirectOutput = true)
        {
            var psi = new ProcessStartInfo
            {
                FileName = fileName,
                Arguments = arguments,
                UseShellExecute = false,
                CreateNoWindow = true,
                RedirectStandardOutput = redirectOutput,
                RedirectStandardError = redirectOutput,
                StandardOutputEncoding = redirectOutput ? Encoding.UTF8 : null,
                StandardErrorEncoding = redirectOutput ? Encoding.UTF8 : null
            };

            using (var process = new Process { StartInfo = psi })
            {
                if (redirectOutput)
                {
                    process.OutputDataReceived += (s, e) =>
                    {
                        if (e.Data != null)
                            OutputReceived?.Invoke(e.Data);
                    };
                    process.ErrorDataReceived += (s, e) =>
                    {
                        if (e.Data != null)
                            OutputReceived?.Invoke("[HIBA] " + e.Data);
                    };
                }

                process.Start();

                if (redirectOutput)
                {
                    process.BeginOutputReadLine();
                    process.BeginErrorReadLine();
                }

                await Task.Run(() => process.WaitForExit());
                return process.ExitCode;
            }
        }

        public async Task<string> RunAndCaptureAsync(string fileName, string arguments)
        {
            var sb = new StringBuilder();
            OutputReceived += line => sb.AppendLine(line);
            await RunAsync(fileName, arguments);
            return sb.ToString();
        }
    }
}