I want to find the last character of a string in C# and then put it in an if statement.
Then if the last character is equal to 'A', 'B' or 'C' a certain action should be performed.
How do I get the last character of a string in C#?
57 Answers
Use the EndsWith() method of strings:
if (string.EndsWith("A") || string.EndsWith("B") || string.EndsWith("C"))
{ //do stuff here
}Heres the MSDN article explaining this method:
I assume you don't actually want the last character position (yourString.Length - 1), but the last character itself. You can find that by indexing the string with the last character position:
yourString[yourString.Length - 1]string is a zero based array of char.
char last_char = mystring[mystring.Length - 1];Regarding the second part of the question, if the char is A, B, C
Using if statement
char last_char = mystring[mystring.Length - 1];
if (last_char == 'A' || last_char == 'B' || last_char == 'C')
{ //perform action here
}Using switch statement
switch (last_char)
{
case 'A':
case 'B':
case 'C': // perform action here break
}There is an index-from-end operator that looks like this: ^n.
var list = new List<int>();
list[^1] // this is the last element
list[^2] // the second-to-last element
list[^n] // etc.The official documentation about indices and ranges describes this operator. One thing to be careful about: this operator can fail at runtime if there are not enough elements in the list (System.ArgumentOutOfRangeException).
With recent C# versions, one can just use Last() or LastOrDefault() on a string in C# to return last char.
string sample = "sample string";
char lastCharacter = sample.Last();
if (lastCharacter == 'A' || lastCharacter == 'B' || lastCharacter == 'C')
{ Console.WriteLine(lastCharacter);
}
else if (lastCharacter == 'g')
{ Console.WriteLine($"found! {char.ToUpper(lastCharacter)}");
}
else if (sample.EndsWith("ing"))
{ Console.WriteLine($"use for multiple characters! {sample}");
}Since C# 8.0, you can use new syntactic forms for System.Index and System.Range hence addressing specific characters in a string becomes trivial. Example for your scenario:
var lastChar = aString[^1..]; // aString[Range.StartAt(new Index(1, fromEnd: true))
if (lastChar == "A" || lastChar == "B" || lastChar == "C") // perform action hereFull explanation here: Ranges (Microsoft Docs)
3You can also get the last character by using LINQ, with myString.Last(), although this is likely slower than the other answers, and it gives you a char, not a string.
