String.join起始和结束索引(String.join starting and ending index)

String.join起始和结束索引(String.join starting and ending index)

我可以在String.Join中指定起始和结束索引吗？ 只是为了澄清，说我有数组A（尺寸为0到20），我想加入元素4到10，这可以用String.Join完成吗？ 我目前这样做的方式是

Dim Str as String Str = "" For I = 4 to 10 Str = Str & A(I) Next

有替代方案吗？ 提前致谢

Can I specify the starting and Ending Index in String.Join ? Just to clarify, say I have array A (dimensioned 0 to 20) and I would like to join elements 4 to 10, can this be done with String.Join? The way I currently do it is

Dim Str as String Str = "" For I = 4 to 10 Str = Str & A(I) Next

Is there an alternative to this? Thanks in advance

最满意答案

您可以使用Linq仅提取所需的数组子集，并将其传递给一行代码中的String.Join。

Dim Str = String.Join("", a.Skip(3).Take(7))

（顺便说一句，这还有一个额外的好处，如果你的数组不包含10个元素，你就不会得到IndexOutOfRange异常）

You can use Linq to extract only the array subset you want and pass it to String.Join in a single line of code.

Dim Str = String.Join("", a.Skip(3).Take(7))

(By the way, this has also the added benefit that if your array doesn't contain 10 elements you don't get an IndexOutOfRange exception)