IndexOf with String array in VB.NET

问题

How would I find the index of an item in the string array in the following code:

Dim arrayofitems() as String
Dim itemindex as UInteger
itemindex = arrayofitems.IndexOf("item test")
Dim itemname as String = arrayofitems(itemindex)

I'd like to know how I would find the index of an item in a string array. (All of the items are lowercase, so case shouldn't matter.)

回答1:

It's a static (Shared) method on the Array class that accepts the actual array as the first parameter, as:

Dim arrayofitems() As String
Dim itemindex As Int32 = Array.IndexOf(arrayofitems, "item test")
Dim itemname As String = arrayofitems(itemindex)

MSDN page

回答2:

Array.FindIndex(arr, (Function(c As String) c=strTokenKey)

Array.FindIndex(arr, (Function(c As String) c.StartsWith(strTokenKey)))

回答3:

IndexOf will return the index in the array of the item passed in, as appears in the third line of your example. It is a static (shared) method on the Array class, with several overloads - so you need to select the correct one.

If the array is populated and has the string "item test" as one of its items then the following line will return the index:

itemindex = Array.IndexOf(arrayofitems, "item test")

回答4:

For kicks, you could use LINQ.

Dim items = From s In arrayofitems _
        Where s = "two" _
        Select s Take 1

You would then access the item like this:

items.First

来源：https://stackoverflow.com/questions/3670244/indexof-with-string-array-in-vb-net

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vb.net

indexof

arrays