Excel xls檔案轉換xlsx
using Microsoft.Office.Interop.Excel;
string fileName = @"C:\Book2.xlsx";
string svfileName = @"C:\Book2.xls";
object oMissing = Type.Missing;
var app = new Microsoft.Office.Interop.Excel.Application();
var wb = app.Workbooks.Open(fileName, oMissing, oMissing,
oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing);
wb.SaveAs(svfileName, XlFileFormat.xlWorkbookNormal, Type.Missing, Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
app.Quit();
補充說明，app.Quit() 後 excel.exe程式依舊存在工作管理員內，就需要以下語法呼叫GC來回收程式
app.Quit(ref missing, ref missing, ref missing);
app = null;
GC.Collect();
GC.WaitForPendingFinalizers();
可參考
http://www.kuqin.com/office/20070909/970.html
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