如何修复错误“无法找到编译动态表达式所需的一种或多种类型。您是否缺少引用？”

Question

在.Net 4.5框架上，我试图用工作表编译包含基本excel操作的C＃代码。但我得到代码行的动态表达式编译错误：

workSheet = workBook.Worksheets.get_Item(1);

代码片段粘贴在

下面

public void CreateSheet()
{
    Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application(); 
    Microsoft.Office.Interop.Excel.Workbook workBook;

    Microsoft.Office.Interop.Excel.Worksheet  workSheet;
    try
    {
        workBook = app.Workbooks.Open(this.FilePath);
        workSheet = workBook.Worksheets.get_Item(1);
        workSheet.Name = "Result Sheet";
        workBook.Save();
    }