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[英]How do I properly clean up Excel interop objects from an C# application?
[英]How to clean up Excel interop objects in C#
當我運行以下代碼時,它仍然不會釋放excel對象。
public static List<string> GetExcelSheets(string FilePath)
{
Microsoft.Office.Interop.Excel.Application ExcelObj = null;
Workbook theWorkbook = null;
Sheets sheets = null;
try
{
ExcelObj = new Microsoft.Office.Interop.Excel.Application();
if (ExcelObj == null)
{
MessageBox.Show("ERROR: EXCEL couldn't be started!");
System.Windows.Forms.Application.Exit();
}
theWorkbook = ExcelObj.Workbooks.Open(FilePath, 0, true, 5, "", "", true, XlPlatform.xlWindows, "\t", false, false, 0, true);
List<string> excelSheets = new List<string>();
sheets = theWorkbook.Worksheets;
foreach (Worksheet item in sheets)
{
excelSheets.Add(item.Name);
}
return excelSheets;
}
catch (Exception ex)
{
return new List<string>();
}
finally
{
// Clean up.
releaseObject(sheets);
releaseObject(theWorkbook);
releaseObject(ExcelObj);
}
}
private static void releaseObject(object obj)
{
try
{
System.Runtime.InteropServices.Marshal.ReleaseComObject(obj);
obj = null;
}
catch (Exception ex)
{
obj = null;
MessageBox.Show("Exception Occured while releasing object " + ex.ToString());
}
finally
{
GC.Collect();
}
}
您忘記保留對ExcelObj.Workbooks
的引用並釋放它:
Workbooks workbooks;
...
workbooks = ExcelObj.Workbooks;
theWorkbook = workbooks.Open(...
...
releaseObject(sheets);
releaseObject(theWorkbook);
releaseObject(workbooks);
releaseObject(ExcelObj);
試試這個代碼:
ExcelObj.Quit();
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