C# array get last item from split in one line

Question

I know that this works to get the first item of an array

string aString = @"hello/all\this\is/a\test";
string firstItemOfSplit = aString.Split(new char[] {'\\', '/'})[0];
//firstItemOfSplit = hello

is there a way to get the last item? Something like

string aString = @"hello/all\this\is/a\test";
string lastItemOfSplit = aString.Split(new char[] {'\\', '/'})[index.last];
//lastItemOfSplit = test

Answer 1

您可以使用 System.Linq 中的 IEnumerable.Last() 扩展方法。

string lastItemOfSplit = aString.Split(new char[] {@"\"[0], "/"[0]}).Last();

Answer 2

Like by using the IEnumerable.Last() extension method? Include System.Linq and you'll have it.

Answer 3

You could always use LINQ:

string lastItem = aString.Split(...).Last();

Note that Enumerable.Last() is optimized when working on an IList<T> and you're not applying a predicate - so it's not even going to walk over the sequence to find the last one. (Not that it's likely to be an issue anyway.)

Answer 4

If you can use Linq:

string aString = @"hello/all\this\is/a\test";
string lastItemOfSplit = aString.Split("\/".ToCharArray ()).Last();

Here is a more GC-friendly version that doesn't require linq.

string aString = @"hello/all\this\is/a\test";
string lastItemOfSplit = 
   aString.Substring(aString.LastIndexOfAny(@"\/".ToCharArray ()) + 1);

Answer 5

使用 .NET Core 3.0（和 .NET Standard 2.1）（C# 8），您可以使用索引类型（ Documentation ）：

string lastValue = aString.Split(new char[] { '\\', '/' })[^1];

Answer 6

this one i tried and it worked.

  string LastItem= (@"hello/all\this\is/a\test").Split(new char[] {@"\"[0], "/"[0]}).Last();
  Console.WriteLine(LastItem);