程序需要读取Exel文件，有如下代码段

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object oMissing = System.Reflection.Missing.Value;  

                Microsoft.Office.Interop.Excel.Application excelApp = new Microsoft.Office.Interop.Excel.Application();  

                excelApp.UserControl = true;  

                excelApp.DisplayAlerts = false;  

                excelApp.Application.Workbooks.Open(strFilePath, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing, oMissing);  

                Workbook workBook = excelApp.Workbooks[1];  

                Worksheet workSheet = (Worksheet)workBook.Worksheets[1];  

下面这句话之前的.net2.0上没问题，在.net4.0上报错 error CS1969: 找不到编译动态表达式所需的一个或多个类型。是否缺少引用?

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Worksheet workSheet = (Worksheet)workBook.Worksheets[1];  

解决方案：修改引用（Microsoft.Office.Interop.Excel）的属性“嵌入互操作类型”由True改为False即可