In .NET 5 / C# 8:
You can write the code marked as the answer as:
public static class StringExtensions
{
public static string TrimLastCharacters(this string str) => string.IsNullOrEmpty(str) ? str : str.TrimEnd(str[^1]);
}
However, as mentioned in the answer, this removes all occurrences of that last character. If you only want to remove the last character you should instead do:
public static string RemoveLastCharacter(this string str) => string.IsNullOrEmpty(str) ? str : str[..^1];
A quick explanation for the new stuff in C# 8:
The ^
is called the "index from end operator". The ..
is called the "range operator". ^1
is a shortcut for arr.length - 1
. You can get all items after the first character of an array with arr[1..]
or all items before the last with arr[..^1]
. These are just a few quick examples. For more information, see https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8, "Indices and ranges" section.
String withoutLast = yourString.Substring(0,(yourString.Length - 1));
if (yourString.Length > 1)
withoutLast = yourString.Substring(0, yourString.Length - 1);
or
if (yourString.Length > 1)
withoutLast = yourString.TrimEnd().Substring(0, yourString.Length - 1);
...in case you want to remove a non-whitespace character from the end.
Very easy and simple:
str = str.Remove( str.Length - 1 );
I took the path of writing an extension using the TrimEnd just because I was already using it inline and was happy with it... i.e.:
static class Extensions
{
public static string RemoveLastChars(this String text, string suffix)
{
char[] trailingChars = suffix.ToCharArray();
if (suffix == null) return text;
return text.TrimEnd(trailingChars);
}
}
Make sure you include the namespace in your classes using the static class ;P and usage is:
string _ManagedLocationsOLAP = string.Empty;
_ManagedLocationsOLAP = _validManagedLocationIDs.RemoveLastChars(",");
The another example of trimming last character from a string:
string outputText = inputText.Remove(inputText.Length - 1, 1);
You can put it into an extension method and prevent it from null string, etc.
Try this:
return( (str).Remove(str.Length-1) );
you could also use this:
public static class Extensions
{
public static string RemovePrefix(this string o, string prefix)
{
if (prefix == null) return o;
return !o.StartsWith(prefix) ? o : o.Remove(0, prefix.Length);
}
public static string RemoveSuffix(this string o, string suffix)
{
if(suffix == null) return o;
return !o.EndsWith(suffix) ? o : o.Remove(o.Length - suffix.Length, suffix.Length);
}
}
string helloOriginal = "Hello! World!";
string newString = helloOriginal.Substring(0,helloOriginal.LastIndexOf('!'));
string s1 = "Hello! world!"
string s2 = s1.Substring(0, s1.Length - 1);
Console.WriteLine(s1);
Console.WriteLine(s2);
string s1 = "Hello! world!";
string s2 = s1.Trim('!');
An example Extension class to simplify this: -
internal static class String
{
public static string TrimEndsCharacter(this string target, char character) => target?.TrimLeadingCharacter(character).TrimTrailingCharacter(character);
public static string TrimLeadingCharacter(this string target, char character) => Match(target?.Substring(0, 1), character) ? target.Remove(0,1) : target;
public static string TrimTrailingCharacter(this string target, char character) => Match(target?.Substring(target.Length - 1, 1), character) ? target.Substring(0, target.Length - 1) : target;
private static bool Match(string value, char character) => !string.IsNullOrEmpty(value) && value[0] == character;
}
Usage
"!Something!".TrimLeadingCharacter('X'); // Result '!Something!' (No Change)
"!Something!".TrimTrailingCharacter('S'); // Result '!Something!' (No Change)
"!Something!".TrimEndsCharacter('g'); // Result '!Something!' (No Change)
"!Something!".TrimLeadingCharacter('!'); // Result 'Something!' (1st Character removed)
"!Something!".TrimTrailingCharacter('!'); // Result '!Something' (Last Character removed)
"!Something!".TrimEndsCharacter('!'); // Result 'Something' (End Characters removed)
"!!Something!!".TrimLeadingCharacter('!'); // Result '!Something!!' (Only 1st instance removed)
"!!Something!!".TrimTrailingCharacter('!'); // Result '!!Something!' (Only Last instance removed)
"!!Something!!".TrimEndsCharacter('!'); // Result '!Something!' (Only End instances removed)
If you want to remove the '!' character from a specific expression("world" in your case), then you can use this regular expression
string input = "Hello! world!";
string output = Regex.Replace(input, "(world)!", "$1", RegexOptions.Multiline | RegexOptions.Singleline);
// result: "Hello! world"
the $1 special character contains all the matching "world" expressions, and it is used to replace the original "world!" expression
Slightly modified version of @Damian Leszczynski - Vash that will make sure that only a specific character will be removed.
public static class StringExtensions
{
public static string TrimLastCharacter(this string str, char character)
{
if (string.IsNullOrEmpty(str) || str[str.Length - 1] != character)
{
return str;
}
return str.Substring(0, str.Length - 1);
}
}
Source: Stackoverflow.com