互操作过程后无法关闭Excel.exe

一尘不染

互操作过程后无法关闭Excel.exe

我在使用Excel Interop时遇到问题。

即使重新分配实例，Excel.exe也不会关闭。

这是我的代码：

using xl = Microsoft.Office.Interop.Excel;


xl.Application excel = new xl.Application();
excel.Visible = true;
excel.ScreenUpdating = false;
if (wordFile.Contains(".csv") || wordFile.Contains(".xls"))
{
   //typeExcel become a string of the document name
   string typeExcel = wordFile.ToString();
   xl.Workbook workbook = excel.Workbooks.Open(typeExcel,
                                                oMissing,  oMissing,  oMissing,  oMissing,
                                                oMissing,  oMissing,  oMissing,  oMissing,
                                                oMissing,  oMissing,  oMissing,  oMissing,
                                                oMissing,  oMissing);
   object outputFileName = null;
   if (wordFile.Contains(".xls"))
   {
     outputFileName = wordFile.Replace(".xls", ".pdf");
   }
   else if (wordFile.Contains(".csv"))
   {
     outputFileName = wordFile.Replace(".csv", ".pdf");
   }

   workbook.ExportAsFixedFormat(XlFixedFormatType.xlTypePDF, outputFileName, 
                                 XlFixedFormatQuality.xlQualityStandard, oMissing,
                                 oMissing, oMissing, oMissing, oMissing, oMissing);

   object saveChanges = xl.XlSaveAction.xlDoNotSaveChanges;
   ((xl._Workbook)workbook).Close(saveChanges, oMissing, oMissing);

   Marshal.ReleaseComObject(workbook);
   workbook = null;
}

我看到了，Marshal.RealeaseComObject应该可以，但是什么也没有。我怎样才能解决这个问题？

谢谢。

阅读 333

2020-05-19

共1个答案

一尘不染

简单规则：避免使用双点调用表达式，例如：

var workbook = excel.Workbooks.Open(/*params*/)

…以这种方式，您不仅要为，还为为RCW创建对象，并且还应该释放它（如果不维护对该对象的引用，则不可能）。workbook``Workbooks

因此，正确的方法将是：

var workbooks = excel.Workbooks;
var workbook = workbooks.Open(/*params*/)

//business logic here

Marshal.ReleaseComObject(workbook);
Marshal.ReleaseComObject(workbooks);
Marshal.ReleaseComObject(excel);

2020-05-19