如何处理来自代码的winrar诊断消息

我正在开发一个windows应用程序，在该应用程序中，我使用winrar命令行实用程序来制作rar文件。

public static string RarFiles(string rarPackagePath,
        Dictionary<int, string> accFiles)
    {
        string error = "";
        try
        {
            string[] files = new string[accFiles.Count];
            int i = 0;
            foreach (var fList_item in accFiles)
            {
                files[i] = "'"" + fList_item.Value;
                i++;
            }
            string fileList = string.Join("'" ", files);
            fileList += "'"";
            System.Diagnostics.ProcessStartInfo sdp = new System.Diagnostics.ProcessStartInfo();
            string cmdArgs = string.Format("A {0} {1} -ep1 -r",
                String.Format("'"{0}'"", rarPackagePath),
                fileList);
            sdp.ErrorDialog = true;
            sdp.UseShellExecute = true;
            sdp.Arguments = cmdArgs;
            sdp.FileName = winrarPath;//Winrar.exe path
            sdp.CreateNoWindow = false;
            sdp.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
            System.Diagnostics.Process process = System.Diagnostics.Process.Start(sdp);
            process.WaitForExit();
            //string s = process.StandardOutput.ReadToEnd();
            error = "OK";
        }
        catch (Exception ex)
        {
            error = ex.Message;
        }
        return error;
    }

谁能告诉我如何处理winrar诊断信息

sdp.StartInfo.RedirectStandardOutput = true;

sdp.Start();
string output = stillc.StandardOutput.ReadToEnd();
sdp.WaitForExit();