加入分离器以供显示的项目列表 [英] Adding a separator to a list of items for display

问题描述

我有我想要显示在C＃它们之间的分隔符的项目清单。使用普通的迭代器我最终会在开始一个额外的分离器或结尾：

I have a list of items that I wish to display with a separator between them in C#. Using a normal iterator I would end up with an extra separator at the beginning or the end:

string[] sa = {"one", "two", "three", "four"};
string ns = "";
foreach(string s in sa)
{
    ns += s + " * ";
}
// ns has a trailing *:
// one * two * three * four *

现在我可以用一个for循环，像这样解决这个问题：

Now I can solve this using a for loop like so:

ns = "";
for(int i=0; i<sa.Length; i++)
{
    ns += sa[i];
    if(i != sa.Length-1)
    	ns += " * ";
}
// this works:
// one * two * three * four

虽然第二个解决方案可它看起来并不很优雅。有没有更好的方式来做到这一点？

Although the second solution works it doesn't look very elegant. Is there a better way to do this?

推荐答案

您需要内置的 的string.join 方式：

You need the built-in String.Join method:

string ns = string.Join(" * ", sa);

如果你想与其他集合类型也这样做，那么你仍然可以使用的string.join 如果你创建一个数组首先使用LINQ的的 的ToArray 方式：

If you want to do the same with other collection types, then you can still use String.Join if you create an array first using LINQ's ToArray method:

string ns = string.Join(" * ", test.ToArray());

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