VB.NET实现：将字符串数组拼接为符合语法规则的语句

我们需要实现一个函数，将字符串数组拼接为符合英文语法的短语，嵌入句子后得到如Today I had apple, banana and milk in a bowl for breakfast.的正确输出。

函数实现 #

Function GetGrammaticalSentence(str As String()) As String
    Select Case str.Length
        Case 0
            Return ""
        Case 1
            Return str(0)
        Case 2
            Return $"{str(0)} and {str(1)}"
        Case Else
            Return $"{String.Join(", ", str.Take(str.Length - 1))} and {str.Last()}"
    End Select
End Function

逻辑说明 #

• 空数组：返回空字符串，避免后续拼接出错
• 单个元素：直接返回该元素，无需额外标点
• 两个元素：用and直接连接，符合英文基础语法
• 三个及以上元素：先将除最后一个元素外的所有项用, 拼接，再通过and连接最后一个元素，匹配常见的英文列举格式

完整测试代码 #

Private _ingredients = {"apple", "banana", "milk"}
Private _breakfastString = $"Today I had {GetGrammaticalSentence(_ingredients)} in a bowl for breakfast."

Sub New()
    Console.WriteLine(_breakfastString)
End Sub

运行后控制台输出：

Today I had apple, banana and milk in a bowl for breakfast.

内容的提问来源于stack exchange，提问作者Rabbi Kaii