【发布时间】：2009-07-07 08:08:32
【问题描述】：
我在使用 HP LaserJet 10xx 打印机上的 .Net 2.0 打印时遇到问题。
有时（有时每月一次，有时每天一次）打印机被“阻塞”，无法从 .net 2.0 打印任何内容。
当调用 printDocument.print 方法时，它会抛出 InvalidPrinterException，即使刚刚从 printDialog 中选择了打印机。打印机在线并且正在工作（可以在上面打印其他所有内容），只有通过 .net 的打印被阻止。
我发现问题出在以下注册表项中：
HKEY_CURRENT_USER\Printers\DevModePerUser
如果此键存在，PrintDocument.PrinterSettings.IsValid 报告“假”。删除此键的那一刻 PrintDocument.PrinterSettings.IsValid 为“真”并且打印机正在工作。现在我正在通过以下方式解决这个问题：如果打印机是“HP”并且 PrinterSettings 是“false”，那么检查注册表项是否存在，擦除该键，然后进行打印。现在，我知道这是蹩脚的，但到目前为止我还没有发现为什么会发生这种情况。我强调，这只发生在 HP LaserJet 10xx 打印机上。在此注册表项存在之前，完全阻止从 .NET 打印。
有没有人看到这样的错误，如果有，解决办法是什么？
编辑：这是阻止 HP1005 打印机的注册表项。
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Printers\DevModePerUser]
"HP LaserJet P1005"=hex:48,00,50,00,20,00,4c,00,61,00,73,00,65,00,72,00,4a,00,\
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00,00,00,00,00,ff,ff,ff,ff,40,17,00,00,e2,20,00,00,01,00,00,00,01,00,00,00
【问题讨论】：
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什么样的.NET程序？ Windows 窗体？如果您退出程序并重新启动会发生什么？
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Windows 窗体程序。退出程序不会改变任何东西。在该密钥存在之前，所有 .NET 打印都会被阻止。即使是最小的 .NET 打印示例程序也无法打印。从非 .NET 程序打印运行良好。