使用HP LaserJet 10xx打印.Net

Question

我在使用HP LaserJet 10xx打印機從.Net 2.0打印時遇到問題。

偶爾（有時一個月一次，有時一天一次）打印機被阻止，以致它無法打印任何來自.net 2.0的內容。

當調用printDocument.print方法時，即使從printDialog中選擇了打印機，也會引發InvalidPrinterException。打印機處於聯機狀態並正在工作（其他所有內容都可以打印在其上），只有通過.net的打印纔會被阻止。

我發現，問題出在下面的註冊表項：

HKEY_CURRENT_USER\Printers\DevModePerUser 

如果此項存在，PrintDocument.PrinterSettings.IsValid報告「假」。此鍵被擦除的時刻PrintDocument.PrinterSettings.IsValid爲'true'且打印機正在工作。現在我正在用下面的方法解決這個問題：如果打印機是「HP」而PrinterSettings是'false'，那麼檢查是否存在註冊表項，擦除鍵然後執行打印。現在，我知道這是蹩腳的，但到目前爲止，我還沒有發現爲什麼會發生這種情況。我強調這隻發生在HP LaserJet 10xx打印機上。從.NET打印完全阻止，直到此註冊表項存在。

有沒有人看到這樣的錯誤，如果是的話，有什麼解決方案？

---

編輯：這裏是使HP1005打印機變紅的註冊表鍵。

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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Answer 1

我不知道是什麼原因導致它，但它可能有助於您瞭解什麼應用程序設置該密鑰。嘗試使用Process Monitor中的註冊表監視工具，從http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx