執行命令提示進程asnyc並得到結果

Question

我需要執行commandpromt進程異步並獲取執行的輸出。我目前有這個代碼

Public Function ExecuteCommandSync(ByVal command As Object) As String 
    Dim result As String = Nothing 
    Try 
     Dim procStartInfo As New System.Diagnostics.ProcessStartInfo("cmd", "/c " & Convert.ToString(command)) 
     procStartInfo.RedirectStandardOutput = True 
     procStartInfo.UseShellExecute = False 
     procStartInfo.CreateNoWindow = True 
     Dim proc As New System.Diagnostics.Process() 
     proc.StartInfo = procStartInfo 
     proc.Start() 
     result = proc.StandardOutput.ReadToEnd() 
     Console.WriteLine(result) 
    Catch objException As Exception 
    End Try 
    Return result 
End Function 

請幫助我將其轉換爲async，而不使用線程。這可能嗎？

謝謝

Answer 1

下面是一個類，達到我相信你在找什麼。

該進程已經運行異步，我相信你正在尋找的是事件驅動和隱藏。 你是否因某種原因特別想要阻塞呼叫，或者害怕線程？

如果我脫離基地，你想阻止，讓我知道我們也可以這樣做，但我無法想象爲什麼。

它基本上允許你創建一個cmd shell並且不可見地與它進行交互。

#Region " Imports " 

Imports System.Threading 
Imports System.ComponentModel 

#End Region 

Namespace Common 

    Public Class CmdShell 

#Region " Variables " 

     Private WithEvents ShellProcess As Process 

#End Region 

#Region " Events " 

     ''' <summary> 
     ''' Event indicating an asyc read of the command process's StdOut pipe has occured. 
     ''' </summary> 
     Public Event DataReceived As EventHandler(Of CmdShellDataReceivedEventArgs) 

#End Region 

#Region " Public Methods " 

     Public Sub New() 
      ThreadPool.QueueUserWorkItem(AddressOf ShellLoop, Nothing) 
      Do Until Not ShellProcess Is Nothing : Loop 
     End Sub 

     ''' <param name="Value">String value to write to the StdIn pipe of the command process, (CRLF not required).</param> 
     Public Sub Write(ByVal value As String) 
      ShellProcess.StandardInput.WriteLine(value) 
     End Sub 

#End Region 

#Region " Private Methods " 

     Private Sub ShellLoop(ByVal state As Object) 
      Try 
       Dim SI As New ProcessStartInfo("cmd.exe") 
       With SI 
        .Arguments = "/k" 
        .RedirectStandardInput = True 
        .RedirectStandardOutput = True 
        .RedirectStandardError = True 
        .UseShellExecute = False 
        .CreateNoWindow = True 
        .WorkingDirectory = Environ("windir") 
       End With 
       Try 
        ShellProcess = Process.Start(SI) 
        With ShellProcess 
         .BeginOutputReadLine() 
         .BeginErrorReadLine() 
         .WaitForExit() 
        End With 
       Catch ex As Exception 
        With ex 
         Trace.WriteLine(.Message) 
         Trace.WriteLine(.Source) 
         Trace.WriteLine(.StackTrace) 
        End With 
       End Try 
      Catch ex As Exception 
       With ex 
        Trace.WriteLine(.Message) 
        Trace.WriteLine(.Source) 
        Trace.WriteLine(.StackTrace) 
       End With 
      End Try 
     End Sub 

     Private Sub ShellProcess_ErrorDataReceived(ByVal sender As Object, ByVal e As System.Diagnostics.DataReceivedEventArgs) Handles ShellProcess.ErrorDataReceived 
      If Not e.Data Is Nothing Then RaiseEvent DataReceived(Me, New CmdShellDataReceivedEventArgs(e.Data)) 
     End Sub 

     Private Sub ShellProcess_OutputDataReceived(ByVal sender As Object, ByVal e As System.Diagnostics.DataReceivedEventArgs) Handles ShellProcess.OutputDataReceived 
      If Not e.Data Is Nothing Then RaiseEvent DataReceived(Me, New CmdShellDataReceivedEventArgs(e.Data & Environment.NewLine)) 
     End Sub 

#End Region 

    End Class 

    <EditorBrowsable(EditorBrowsableState.Never)> _ 
     Public Class CmdShellDataReceivedEventArgs : Inherits EventArgs 
     Private _Value As String 

     Public Sub New(ByVal value As String) 
      _Value = value 
     End Sub 

     Public ReadOnly Property Value() As String 
      Get 
       Return _Value 
      End Get 
     End Property 

    End Class 

End Namespace