Remove last characters from a string in C#. An elegant way?
C#.NetStringC# Problem Overview
I have a numeric string like this 2223,00
. I would like to transform it to 2223
. This is: without the information after the ",". Assume that there will be only two decimals after the ",".
I did:
str = str.Remove(str.Length - 3, 3);
Is there a more elegant solution? Maybe using another function? -I don´t like putting explicit numbers-
C# Solutions
Solution 1 - C#
You can actually just use the Remove overload that takes one parameter:
str = str.Remove(str.Length - 3);
However, if you're trying to avoid hard coding the length, you can use:
str = str.Remove(str.IndexOf(','));
Solution 2 - C#
Perhaps this:
str = str.Split(",").First();
Solution 3 - C#
This will return to you a string excluding everything after the comma
str = str.Substring(0, str.IndexOf(','));
Of course, this assumes your string actually has a comma with decimals. The above code will fail if it doesn't. You'd want to do more checks:
commaPos = str.IndexOf(',');
if(commaPos != -1)
str = str.Substring(0, commaPos)
I'm assuming you're working with a string to begin with. Ideally, if you're working with a number to begin with, like a float or double, you could just cast it to an int
, then do myInt.ToString()
like:
myInt = (int)double.Parse(myString)
This parses the double using the current culture (here in the US, we use .
for decimal points). However, this again assumes that your input string is can be parsed.
Solution 4 - C#
String.Format("{0:0}", 123.4567); // "123"
If your initial value is a decimal into a string, you will need to convert
String.Format("{0:0}", double.Parse("3.5", CultureInfo.InvariantCulture)) //3.5
In this example, I choose Invariant culture but you could use the one you want.
I prefer using the Formatting function because you never know if the decimal may contain 2 or 3 leading number in the future.
Edit: You can also use Truncate
to remove all after the , or .
Console.WriteLine(Decimal.Truncate(Convert.ToDecimal("3,5")));
Solution 5 - C#
Use:
public static class StringExtensions
{
/// <summary>
/// Cut End. "12".SubstringFromEnd(1) -> "1"
/// </summary>
public static string SubstringFromEnd(this string value, int startindex)
{
if (string.IsNullOrEmpty(value)) return value;
return value.Substring(0, value.Length - startindex);
}
}
I prefer an extension method here for two reasons:
- I can chain it with Substring.
Example: f1.Substring(directorypathLength).SubstringFromEnd(1)
- Speed.
Solution 6 - C#
You could use LastIndexOf and Substring combined to get all characters to the left of the last index of the comma within the sting.
string var = var.Substring(0, var.LastIndexOf(','));
Solution 7 - C#
You can use TrimEnd
. It's efficient as well and looks clean.
"Name,".TrimEnd(',');
Solution 8 - C#
Try the following. It worked for me:
str = str.Split(',').Last();
Solution 9 - C#
Since C# 8.0 it has been possible to do this with a range operator.
string textValue = "2223,00";
textValue = textValue[0..^3];
Console.WriteLine(textValue);
This would output the string 2223
.
The 0
says that it should start from the zeroth position in the string
The ..
says that it should take the range between the operands on either side
The ^
says that it should take the operand relative to the end of the sequence
The 3
says that it should end from the third position in the string
Solution 10 - C#
Use lastIndexOf. Like:
string var = var.lastIndexOf(',');