c# – 嵌套和非嵌套的else / else ifs之间有区别吗?
发布时间:2020-12-16 01:59:55 所属栏目:百科 来源:网络整理
导读:我有一个任务在于将旧的vb代码重写为c#,我遇到了这个问题 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
我有一个任务在于将旧的vb代码重写为c#,我遇到了这个问题
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 If End 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
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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.. (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |