If (termNumber = TermNumberCode.FallWinter) Then Dim first_term As String = " ((Course.dbo.CourseList.[Year])=@TermYear) AND ((Course.dbo.CourseList.TermNumber)=3) " Dim second_term As String = " ((Course.dbo.CourseList.Year)=@TermYear+1) AND ((Course.dbo.CourseList.TermNumber)=1) " query &= " AND ( ( " & first_term & " ) OR ( " & second_term & " ) ) "Else If (termNumber = TermNumberCode.Summer) Then query &= " AND ((Course.dbo.CourseList.[Year])=@TermYear) AND ((Course.dbo.CourseList.TermNumber)=2) " ElseIf (termNumber = TermNumberCode.Fall) Then query &= " AND ((Course.dbo.CourseList.[Year])=@TermYear) AND ((Course.dbo.CourseList.TermNumber)=3) " ElseIf (termNumber = TermNumberCode.Winter) Then query &= " AND ((Course.dbo.CourseList.[Year])=@TermYear) AND ((Course.dbo.CourseList.TermNumber)=1) " End IfEnd If
我想知道,这是否像写这样或者是否有任何特殊意义或嵌套ifs那样?
If (termNumber = TermNumberCode.FallWinter) Then code...Else if (termNumber = TermNumberCode.Summer) code...Else If (termNumber = TermNumberCode.Fall) code...Else //(termNumber = TermNumberCode.Winter) code...解决方法 表格
if #1.. else if #2.. else if #3.. else ..end
相当于
if #1..else if #2..else if #3..else ..
也就是说,在else中直接嵌套不会影响嵌套分支的逻辑.这可以无限期地重复 – 尽管非嵌套形式在这里可以说更清楚.
然而,在所呈现的代码中,else和最后的else if被转置,如果termNumber被约束到被检查的集合,则这将没有区别.但这是一个区别 – 如果termNumber是TermNumberCode.SpringBreak怎么办? – 因此必须与上述转换分开考虑..
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