異步調用一個System.Action例如在PowerShell中

Question

背景

首先我創建了一個System.Action實例：

PS C:\Users\KnutKristian> $a = [Action]{} 

在看看成員：

PS C:\Users\KnutKristian> $a | gm 

    TypeName: System.Action 

Name    MemberType Definition           
----    ---------- ----------           
BeginInvoke  Method  System.IAsyncResult BeginInvoke(System.AsyncCal... 
Clone    Method  System.Object Clone(), System.Object ICloneable... 
DynamicInvoke  Method  System.Object DynamicInvoke(Params System.Objec... 
EndInvoke   Method  void EndInvoke(System.IAsyncResult result)   
Equals   Method  bool Equals(System.Object obj)      
GetHashCode  Method  int GetHashCode()         
GetInvocationList Method  System.Delegate[] GetInvocationList()    
GetObjectData  Method  void GetObjectData(System.Runtime.Serialization... 
GetType   Method  type GetType()          
Invoke   Method  void Invoke()          
ToString   Method  string ToString()         
Method   Property System.Reflection.MethodInfo Method {get;}   
Target   Property System.Object Target {get;} 

的BeginInvoke簽名：

PS C:\Users\KnutKristian> $a.BeginInvoke.OverloadDefinitions 
System.IAsyncResult BeginInvoke(System.AsyncCallback callback, System.Object ob 
ject) 

當我嘗試做開始調用我得到這個錯誤：

PS C:\Users\KnutKristian> $a.BeginInvoke($null, $null) 
Exception calling "BeginInvoke" with "2" argument(s): "The object must be a run 
time Reflection object." 
At line:1 char:1 
+ $a.BeginInvoke($null, $null) 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : NotSpecified: (:) [], MethodInvocationException 
    + FullyQualifiedErrorId : ArgumentException 

指定的東西沒有幫助：

PS C:\Users\…> $a.BeginInvoke([AsyncCallback]{param([IAsyncResult] $a)}, '') 
Exception calling "BeginInvoke" with "2" argument(s): "The object must be a run 
time Reflection object." 
At line:1 char:1 
+ $a.BeginInvoke([AsyncCallback]{param([IAsyncResult] $a)}, '') 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : NotSpecified: (:) [], MethodInvocationException 
    + FullyQualifiedErrorId : ArgumentException 

一些異常信息：

PS C:\Users\KnutKristian> $Error[0].Exception.InnerException | gm 


    TypeName: System.ArgumentException 

Name    MemberType Definition           
----    ---------- ----------           
Equals   Method  bool Equals(System.Object obj), bool _Exception.... 
GetBaseException Method  System.Exception GetBaseException(), System.Exce... 
GetHashCode  Method  int GetHashCode(), int _Exception.GetHashCode()  
GetObjectData Method  void GetObjectData(System.Runtime.Serialization.... 
GetType   Method  type GetType(), type _Exception.GetType()   
ToString   Method  string ToString(), string _Exception.ToString()  
Data    Property System.Collections.IDictionary Data {get;}   
HelpLink   Property string HelpLink {get;set;}       
HResult   Property int HResult {get;}         
InnerException Property System.Exception InnerException {get;}    
Message   Property string Message {get;}        
ParamName  Property string ParamName {get;}        
Source   Property string Source {get;set;}       
StackTrace  Property string StackTrace {get;}       
TargetSite  Property System.Reflection.MethodBase TargetSite {get;} 


PS C:\Users\KnutKristian> $Error[0].Exception.InnerException | 
    fl Message, ParamName, InnerException -Force 


Message  : The object must be a runtime Reflection object. 
ParamName  : 
InnerException : 

問題

1. 什麼信息

   The object must be a run time Reflection object.

   是否意味着在這方面？據我所知，這裏只有.NET對象。也許抱怨一些PowerShell的具體細節？

2. 我怎樣才能成功運行BeginInvoke方法？異步

Answer 1

嘗試下面的代碼。

[Action]{}|%{$_.BeginInvoke($null, $null)} 


IsCompleted   : True 
AsyncDelegate   : System.Action 
AsyncState    : 
CompletedSynchronously : False 
EndInvokeCalled  : False 
AsyncWaitHandle  : System.Threading.ManualResetEvent 
NextSink    : 

請看看下面的文章，瞭解RunTimeType http://msdn.microsoft.com/en-us/library/ms172329.aspx

Answer 2

要運行的東西，你可以嘗試jobs（多進程方式，而不是如此高效的），或者你可以嘗試如圖this post創建RunspacePool。