net导出excel释放资源,

xBk.Close(false, Type.Missing, Type.Missing);
        excel.Quit();
        System.Runtime.InteropServices.Marshal.ReleaseComObject(xBk);   //释放工作表   
        System.Runtime.InteropServices.Marshal.ReleaseComObject(xSt);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
        xSt = null;
        excel = null;
        xBk = null;
        GC.Collect();