C# 呼叫外部程式類別實作（二）：完整程式碼與錯誤處理

ReadErrorThread - 非同步讀取標準錯誤

class ReadErrorThread
{
    Thread m_Thread; Process m_Process; string m_Error; bool m_HasExisted; object m_LockObj = new object();
    public string Error { get { return m_Error; } }
    public bool HasExisted { get { lock(m_LockObj) return m_HasExisted; } set { lock(m_LockObj) m_HasExisted = value; } }

    void ReadError()
    {
        StringBuilder sb = new StringBuilder();
        while (!m_Process.HasExited) sb.AppendLine(m_Process.StandardError.ReadLine());
        sb.Append(m_Process.StandardError.ReadToEnd());
        m_Error = sb.ToString();
        HasExisted = true;
    }

    public ReadErrorThread(Process p) { m_Process = p; m_Thread = new Thread(ReadError); m_Thread.Start(); }
}

RunProcess - 執行外部程式並捕獲輸出/錯誤

class RunProcess
{
    string m_Error, m_Output;
    public string Error { get { return m_Error; } }
    public string Output { get { return m_Output; } }
    public bool HasError { get { return !string.IsNullOrEmpty(m_Error); } }

    public void Run(string fileName, string para)
    {
        // 關閉 Windows 錯誤報告對話框
        try
        {
            var key = Registry.LocalMachine.OpenSubKey(@"software\microsoft\PCHealth\ErrorReporting\", true);
            if ((int)key.GetValue("DoReport") != 0) key.SetValue("DoReport", 0);
            if ((int)key.GetValue("ShowUI") != 0) key.SetValue("ShowUI", 0);
        } catch { }

        m_Error = m_Output = "";
        try
        {
            Process p = new Process();
            p.StartInfo.FileName = fileName;
            p.StartInfo.Arguments = para;
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.CreateNoWindow = true;
            p.Start();

            ReadErrorThread errThread = new ReadErrorThread(p);
            StringBuilder outSb = new StringBuilder();
            while (!p.HasExited) outSb.AppendLine(p.StandardOutput.ReadLine());
            outSb.Append(p.StandardOutput.ReadToEnd());
            while (!errThread.HasExisted) Thread.Sleep(1);
            m_Error = errThread.Error;
            m_Output = outSb.ToString();
        }
        catch (Exception e) { m_Error = e.Message; }
    }
}

使用方式

var runner = new RunProcess();
runner.Run("cmd.exe", "/c dir");
Console.WriteLine(runner.Output);
if (runner.HasError) Console.WriteLine("Error: " + runner.Error);