更改“/”分隔字符串中最后一个元素的最有效方法是什么

Question

I have a string object in c# with a bunch of elements delimited by '/' characters. The string will look something like this:

"element1/element2/element3/element4"

What's the most efficient way to change the last element in the '/' delimited string?

Answer 1

Use string.LastIndexOf :

string s = "element1/element2/element3/element4";
s = s.Substring(0, s.LastIndexOf('/') + 1) + "foo";

Answer 2

如果这是文件名/路径字符串，则应使用System.IO.Path 。

Answer 3

is there a 'lastIndexOf' in the C# String class? ( I don't code in C# normally ), if it exists you could use that to get a reference to the last / in the string, and that / precedes the last element of your string.

Answer 4

Like Joel suggests.. maybe something like this:

     string path = (System.IO.Path.GetDirectoryName(@"element1/element2/element3/element4") +
        System.IO.Path.DirectorySeparatorChar + "foo");
     string new_path = path.Replace(System.IO.Path.DirectorySeparatorChar, '/');