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我需要一个不直接打印的打印机列表。获得一个可以直接打印的列表似乎相当容易。但是如何做相反的事情呢？

    Dim PrintServer As New SysPrint.PrintServer
    Dim arrFlags(0) As SysPrint.EnumeratedPrintQueueTypes
    arrFlags(0) = System.Printing.EnumeratedPrintQueueTypes.DirectPrinting
    Dim QColl As SysPrint.PrintQueueCollection = PrintServer.GetPrintQueues(arrFlags)

PrintServer.GetPrintQueues 方法

EnumeratedPrintQueueTypes 枚举

MSDN 说 EnumeratedPrintQueueTypes 有一个 FlagsAttribute 属性，它允许按位组合其成员值。所以我应该能够以某种方式指定不直接。我该怎么做？

我试图这样做，arrFlags(0) = Not System.Printing.EnumeratedPrintQueueTypes.DirectPrinting但没有返回任何结果。显然不正确。

那么如何操作 flags 属性来消除所有直接打印的打印机呢？

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1 回答 1

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这是一种方法，但它似乎很不优雅：

    'get full list
    Dim PrintServer As New SysPrint.PrintServer
    Dim QColl As SysPrint.PrintQueueCollection = PrintServer.GetPrintQueues()

    'get those not printing direct 
    Dim Qcoll2 As List(Of SysPrint.PrintQueue) = QColl.Where(Function(x) Not (x.IsDirect)).ToList

    'select name only
    Dim strList As List(Of String) = Qcoll2.Select(Function(x) x.Name).ToList
于 2015-11-09T10:11:34.197 回答