這段時(shí)間在VS?2003?的WebForm?方式下對Excel?進(jìn)行操作，遇到一個(gè)最為頭疼的問題就是對Excel操作完畢后Excel不能夠正常關(guān)閉，系統(tǒng)退出后，Excel總是駐留在內(nèi)存中。但是這段代碼放到WinForm的程序中又沒有問題。在網(wǎng)上進(jìn)行了查找也沒有找到有效可行的辦法。經(jīng)過無數(shù)次的嘗試，終于解決如下：

原來書寫如下：

private?Excel.Application?m_app;

private?Excel.Workbook?m_workbook;

this.m_app?=?new?Excel.ApplicationClass();

this.m_app.DisplayAlerts?=?false;

this.m_workbook?=?this.m_app.Workbooks.Open(sFilePath,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,

????????????Missing.Value?);

修改后如下：

private?Excel.Application?m_app;

private?Excel.Workbooks?m_workbooks;

private?Excel.Workbook?m_workbook;

this.m_app?=?new?Excel.ApplicationClass();

this.m_app.DisplayAlerts?=?false;

m_workbooks?=?this.m_app.Workbooks;

this.m_workbook?=?this.m_workbooks.Open(sFilePath,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,?

??????????????Missing.Value,?Missing.Value,?Missing.Value,

????????????Missing.Value?);

?

同樣對Sheet的操作如下

修改前如下：

Excel._Worksheet?worksheet1?=?null;

worksheet1?=?(Excel._Worksheet)?this.m_workbook.Worksheets.get_Item(sSheetName);

修改后如下：

Excel.Sheets?sheets?=?null?;

Excel._Worksheet?worksheet1?=?null;

sheets?=?this.m_workbook.Worksheets;

worksheet1?=?(Excel._Worksheet)?sheets.get_Item(sSheetName);

發(fā)現(xiàn)區(qū)別了么？原來Workbooks，Worksheets這兩個(gè)類沒有被實(shí)例化就直接使用了，造成該類不能夠被回收。最終造成Excel在內(nèi)存的駐留。

最終以如下方式釋放。

private?void?ReleaseAllRef(Object?obj)

{

try

??????????????{

??????????????if?(obj?!=?null?)

????????????????????????????{

??????????????????????????????????????????while?(Marshal.ReleaseComObject(obj)?>?1);

????????????????????????????}

??????????????}

??????????????finally

??????????????{

????????????????????????????obj?=?null;

??????????????}

}

private?void?Release()

{

??????????????if?(m_app?!=?null?)

??????????????{

????????????????????????????m_app.Quit()?;

??????????????}

??????????????ReleaseAllRef(m_workbook)?;?

??????????????m_workbook?=?null?;?

??????????????ReleaseAllRef(m_workbooks)?;?

??????????????m_workbooks?=?null?;?

??????????????ReleaseAllRef(m_app)?;?

??????????????m_app?=?null?;?

??????????????System.GC.Collect()?;

}
?

總結(jié)

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