Excel在.Net下驻留内存的解决方法
这段时间在VS 2003 的WebForm 方式下对Excel 进行操作,遇到一个最为头疼的问题就是对Excel操作完毕后Excel不能够正常关闭,系统退出后,Excel总是驻留在内存中。但是这段代码放到WinForm的程序中又没有问题。在网上进行了查找也没有找到有效可行的办法。经过无数次的尝试,终于解决如下:
原来书写如下:
以下是引用片段: 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:
以下是引用片段: 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 ); |
同样对Sheet的操作如下
修改前如下:
以下是引用片段: 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); |
发现区别了么?原来Workbooks,Worksheets这两个类没有被实例化就直接使用了,造成该类不能够被回收。最终造成Excel在内存的驻留。
最终以如下方式释放。
以下是引用片段: 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() ; } |
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