后台打印控件使用后销毁

DK.Service/BarcodePrintService/InvoiceLayoutPrinter.cs

@@ -39,7 +39,7 @@ namespace Dongke.WinForm.Controls.InvoiceLayout
         private DataRow _printData = null;
         private DataTable _printGridData = null;
 
-        private PrintDocument _printDocument = new PrintDocument();
+        private PrintDocument _printDocument = null;
 
         /// <summary>
         /// 0：正常，1：旋转180，
@@ -56,9 +56,6 @@ namespace Dongke.WinForm.Controls.InvoiceLayout
 
         private InvoiceLayoutPrinter()
         {
-            _printDocument.DocumentName = "LayoutDocument";
-            _printDocument.BeginPrint += new PrintEventHandler(this.printDocument_BeginPrint);
-            _printDocument.PrintPage += new PrintPageEventHandler(this.PrintDocument_PrintPage);
         }
         #endregion
 
@@ -130,8 +127,8 @@ namespace Dongke.WinForm.Controls.InvoiceLayout
             try
             {
                 //Logger.Debug("打印开始1");
-                InvoiceLayoutPrinter printer = new InvoiceLayoutPrinter();
 
+                InvoiceLayoutPrinter printer = new InvoiceLayoutPrinter();
                 printer._printDirectionKind = printDirectionKind;
 
                 printer.LayoutItems = new List<LayoutItem>();
@@ -140,15 +137,23 @@ namespace Dongke.WinForm.Controls.InvoiceLayout
                 printer._printGridData = detail;
                 //Logger.Debug("打印开始2");
 
-                printer._printDocument.PrinterSettings.PrinterName = printerName;
-                printer._printDocument.PrinterSettings.Copies = copies;
 
-                //Logger.Debug("打印开始3");
-                printer._printDocument.Print();
-                //Logger.Debug("打印开始4");
+                using (printer._printDocument = new PrintDocument())
+                {
+                    printer._printDocument.DocumentName = "LayoutDocument";
+                    printer._printDocument.BeginPrint += new PrintEventHandler(printer.printDocument_BeginPrint);
+                    printer._printDocument.PrintPage += new PrintPageEventHandler(printer.PrintDocument_PrintPage);
 
-                //return printer.DrawImages().ToArray();
-                //return printer.DrawImages();
+                    printer._printDocument.PrinterSettings.PrinterName = printerName;
+                    printer._printDocument.PrinterSettings.Copies = copies;
+
+                    //Logger.Debug("打印开始3");
+                    printer._printDocument.Print();
+                    //Logger.Debug("打印开始4");
+
+                    //return printer.DrawImages().ToArray();
+                    //return printer.DrawImages();
+                }
             }
             catch (Exception ex)
             {