我有一個名爲「獲取-連接」功能，它返回一些SQL連接的列表，例如：這個PowerShell Foreach-Object語句有什麼問題？

PS C:\Windows\system32> Get-Connections 

Id     : e1a2fd17-91aa-4975-b1ee-1a7df65e6d6b 
DataSource   : myDataSource1 
InitialCatalog  : myInitCatalog 
UseIntegratedSecurity : True 
DisplayName   : testConnection 

Id     : 2688f2af-1b49-405f-aa92-417a43b76dca 
DataSource   : myDataSource1 
InitialCatalog  : myInitCatalog 
UseIntegratedSecurity : True 
DisplayName   : testConnection

我還調用的函數「刪除連接」用來消除ID的連接：

Remove-Connection "2688f2af-1b49-405f-aa92-417a43b76dca"

現在我tryed使用

Get-Connections | % { Remove-Connection $_.Id }

這不工作，除去所有連接，例外的是：

Remove-Connection : Cannot convert 'System.Object[]' to the type 'System.Guid' required by parameter 'Id'. Specified method is not supported.

工作是這樣的究竟是什麼：

Get-Connections | % { $_.Id } | % { Remove-Connection "$_" }

哪些錯誤與以前的聲明？

更新1

獲取連接：

[Cmdlet(VerbsCommon.Get, "Connections", SupportsShouldProcess = true)] 
    public class GetConnectionsCommand : Cmdlet 
    { 
     private List<ConnectionDto> Connections { get; set; } 

     public void GetConnections() 
     { 
      var binding = new BasicHttpBinding(); 
      var address = new EndpointAddress(Address); 

      var repositoryService = new WcfConnectionRepositoryServiceProxy(binding, address); 

      Connections = repositoryService.GetAll().ToList(); 
     } 

     protected override void BeginProcessing() 
     { 
      base.BeginProcessing(); 
      GetConnections(); 
     } 

     protected override void ProcessRecord() 
     { 
      base.ProcessRecord(); 
      WriteObject(Connections); 
     } 
    }

刪除連接：

[Cmdlet(VerbsCommon.Remove, "Connection", SupportsShouldProcess = true)] 
     public class RemoveConnectionCommand : Cmdlet 
     { 
      [Parameter(Position = 0, ParameterSetName = "Id", 
       Mandatory = true, ValueFromPipeline = true, 
       ValueFromPipelineByPropertyName = true, 
       HelpMessage = "Please enter the ID of the connection to remove")] 
      [ValidateNotNullOrEmpty] 
      public Guid Id { get; set; } 

      private void RemoveConnection() 
      { 
       var binding = new BasicHttpBinding(); 
       var address = new EndpointAddress(Address); 

       var repositoryService = new WcfConnectionRepositoryServiceProxy(binding, address); 
       repositoryService.Delete(Id); 
      } 

      protected override void BeginProcessing() 
      { 
       base.BeginProcessing(); 
       RemoveConnection(); 
      } 
     }

DTO：

[DataContract(Name = "ConnectionDto"] 
    public class ConnectionDto 
    { 
     [DataMember] 
     public Guid Id { get; set; } 

     [DataMember] 
     public string DataSource { get; set; } 

     ...

來源

2013-04-02 Martin Brandl

Get-Connections的返回類型是什麼？一個列表或數組？ – Jackie

或者更具體地說，'Get-Connections'返回的對象的'Id'屬性的類型是什麼？你有沒有嘗試過'Get-Connections | ％{Remove-Connection $ _。Id.ToString（）}'？ – alroc

Get-Connections的類型是ConnectionDTO的列表。 ConnectionDTO的Id屬性是一個GUID，Remove-Connection也需要一個GUID。您的示例也不起作用：Remove-Connection：無法綁定參數「Id」。無法將值「System.Object []」轉換爲鍵入「System.Guid」。錯誤：？「GUID應該包含32個數字與4個短線 –

我終於找到了答案。我必須在括號中設置Get-Connections命令：

(Get-Connections) | % { Remove-Connection $_.Id }

來源

2013-04-04 13:20:37

這個PowerShell Foreach-Object語句有什麼問題？

更新1

回答

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