C# 打印机连接状态判断 _

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/// <summary>         /// 判断是否连接打印机         /// </summary>         public bool CheckPrinter()         {             //取得默认打印机名             PrintDocument pdoc = new PrintDocument();             string printerName1 = pdoc.PrinterSettings.PrinterName;               ManagementScope scope = new ManagementScope(@"\root\cimv2");             scope.Connect();               // Select Printers from WMI Object Collections             ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_Printer");               string printerName = "";             foreach (ManagementObject printer in searcher.Get())             {                 printerName = printer["Name"].ToString().ToLower();                 if (printerName.IndexOf(printerName1.ToLower()) > -1)                 {                       if (printer["WorkOffline"].ToString().ToLower().Equals("true"))                     {                         switch (MessageBox.Show("默认打印机未连接或出错", "警告", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Error))                         {                             case DialogResult.Retry:                                 CheckPrinter();                                 break;                         }                         return false;                         // printer is offline by user                       }                     else                     {                         // printer is not offline                           return true;                     }                 }             }             switch (MessageBox.Show("默认打印机未连接或出错", "警告", MessageBoxButtons.AbortRetryIgnore, MessageBoxIcon.Error))             {                 case DialogResult.Retry:                     CheckPrinter();                     break;             }             return false;         }           /// <summary>         /// 判断打印机状态,传Exception         /// </summary>         /// <param name="ex">Exception</param>         public void ErrerPrint(Exception ex)         {             PrintQueue pq = LocalPrintServer.GetDefaultPrintQueue();             string PrintStaticText = "";             bool isPrintErrer = false;                 switch (pq.QueueStatus)             {                 case PrintQueueStatus.Busy:                     PrintStaticText = "打印机正忙";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.DoorOpen:                     PrintStaticText = "打印机上的门已打开";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.Error:                     PrintStaticText = "由于错误情况，打印机无法打印。";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.IOActive:                     PrintStaticText = "打印机正在与打印服务器交换数据";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.Initializing:                     PrintStaticText = "打印机正在初始化";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.ManualFeed:                     PrintStaticText = "打印机正在等待用户将打印介质放入手动送纸盒";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.NoToner:                     PrintStaticText = "打印机墨粉用完";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.None:                     PrintStaticText = "未指定状态。";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.NotAvailable:                     PrintStaticText = "状态信息不可用";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.Offline:                     PrintStaticText = "打印机处于脱机状态。";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.OutOfMemory:                     PrintStaticText = "打印机无可用内存";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.OutputBinFull:                     PrintStaticText = "打印机的输出纸盒已满";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.PagePunt:                     PrintStaticText = "打印机不能打印当前页";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.PaperJam:                     PrintStaticText = "打印机卡纸";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.PaperOut:                     PrintStaticText = "打印机中没有或已用完当前打印作业所需的纸张类型";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.PaperProblem:                     PrintStaticText = "打印机中的纸张导致未指定的错误情况";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.Paused:                     PrintStaticText = "打印队列已暂停";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.PendingDeletion:                     PrintStaticText = "打印队列正在删除打印作业";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.PowerSave:                     PrintStaticText = "打印机处于节能模式";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.Printing:                     PrintStaticText = "设备正在打印";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.Processing:                     PrintStaticText = "设备正在执行某种工作，如果此设备是集打印机、传真机和扫描仪于一体的多功能设备，则不需要打印";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.ServerUnknown:                     PrintStaticText = "打印机处于错误状态";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.TonerLow:                     PrintStaticText = "打印机中只剩下少量墨粉";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.UserIntervention:                     PrintStaticText = "打印机要求通过用户操作来更正错误情况";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.Waiting:                     PrintStaticText = "打印机正在等待打印作业";                     isPrintErrer = true;                     break;                 case PrintQueueStatus.WarmingUp:                     PrintStaticText = "打印机正在预热";                     isPrintErrer = true;                     break;             }               if (isPrintErrer)             {                 WriteLog.SetString(PrintStaticText);                 MessageBox.Show(PrintStaticText, "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);             }             if (ex.Message == "The net printer is unavailable.")             { 　　　　　　　　　　                   MessageBox.Show("网络打印机不可用", "警告", MessageBoxButtons.OK, MessageBoxIcon.Error);                 WriteLog.SetString(ex.Message);             }             else             {                 WriteLog.SetException(ex);             }         }