如何使用 foreach 循环在列表中的短语之间添加分隔符？

Question

I have this code:

foreach (var node in nodes)
{
    result += node.InnerText;
}

The InnerText is simply 1-2 characters that never contain the # symbol. There can be one or more values of node in nodes.

How can I delimit each of these so that, for example, if these were the values of node:

"ab" and "cd"  

That the result would be ab#cd .

I know I can just add # to the value but then what about the last character. If I just did simple adding of # then I would get ab#cd# which is not what I want.

Answer 1

Using the string.Join is a good place to use in this situation.

string result = string.Join("#", nodes.Select(n => n.InnerText))

Answer 2

You can use .IndexOf to know the current index of node in foreach loop. You should be concatenating node.InnerText as long as current index of node is not equal to (nodes.Count - 1) .

foreach (var node in nodes)
{
    //You can identify the last element in nodes like below
    if (nodes.IndexOf(node) != nodes.Count - 1) 
    {
        result += node.InnerText;
    }
}