Question

此代码：

Module Module1
    Sub Main()
    ' Our input string.
    Dim animals As String = "cat, dog, bird"

    ' See if dog is contained in the string.
    If Not animals.IndexOf("dog") = -1 Then
        Console.WriteLine(animals.IndexOf("dog"))
    End If
    End Sub
End Module

在字符串

中返回起始位置5

但是如何返回字符串的索引：

for cat = 1
for dog = 2
for bird = 3

Answer 1

查看所需的输出，您似乎想要获取字符串中的单词索引。您可以通过将字符串拆分为数组，然后使用方法Array.FindIndex在数组中查找项来完成此操作：

Dim animals = "cat, dog, bird"

' Split string to array
Dim animalsArray = animals.Split(New String() {",", " "}, StringSplitOptions.RemoveEmptyEntries)

' Item to find
Dim itemToFind = "dog"
' Find index in array
Dim index = Array.FindIndex(Of String)(animalsArray, Function(s) s = itemToFind)
' Add 1 to the output:
Console.WriteLine(index + 1)

上面的代码返回2.对于cat，你会得到1而对于bird，结果将是3.如果数组中没有项目，则输出为0

返回字符串中单词的索引

1 个答案: