I want to remove last three characters from a string: string myString = "abcdxxx"; Note that the string is dynamic data.

Remove the last three characters from a string

Answers (17)

Reputation: 2994

Here is a generic and ready to use method. It takes char count to trim from the end, uses C# 8.0 Range operator and checks for invalid input:

static string? TrimEnd(string? text, int charCount)
{
    if (text == null || text.Length <= charCount || charCount < 0)
    {
        return null;
    }
    return text[..^charCount];
}

Usage:

string myString = "abcdxxx";
string? result = TrimEnd(myString, 3);
// Here result is "abcd"

Upvotes: 0

Ali Hamza Ansari

Reputation: 21

You can call the Remove method and pass the last 3 characters

str.Substring(str.Length-3)

Complete code can be

str.Remove(str.Substring(str.Length-3));

Upvotes: -1

Granger

Reputation: 4379

If you're working in C# 8 or later, you can use "ranges":

string myString = "abcdxxx";
string trimmed = myString[..^3]; // "abcd"

More examples:

    string test = "0123456789", s;
    char c;
    c = test[^3]; // '7'
    s = test[0..^3]; // "0123456"
    s = test[..^3]; // "0123456"
    s = test[2..^3]; // "23456"
    s = test[2..7]; // "23456"
    //c = test[^12]; // IndexOutOfRangeException
    //s = test[8..^3]; // ArgumentOutOfRangeException
    s = test[7..^3]; // string.Empty

Upvotes: 13

vullnetyy

Reputation: 1701

The new C# 8.0 range operator can be a great shortcut to achieve this.

Example #1 (to answer the question):

string myString = "abcdxxx";
var shortenedString = myString[0..^3]
System.Console.WriteLine(shortenedString);
// Results: abcd

Example #2 (to show you how awesome range operators are):

string s = "FooBar99";
// If the last 2 characters of the string are 99 then change to 98
s = s[^2..] == "99" ? s[0..^2] + "98" : s;
System.Console.WriteLine(s);
// Results: FooBar98

Upvotes: 22

new Q Open Wid

Reputation: 2283

Easy. text = text.remove(text.length - 3). I subtracted 3 because the Remove function removes all items from that index to the end of the string which is text.length. So if I subtract 3 then I get the string with 3 characters removed from it.

You can generalize this to removing a characters from the end of the string, like this:

text = text.remove(text.length - a)

So what I did was the same logic. The remove function removes all items from its inside to the end of the string which is the length of the text. So if I subtract a from the length of the string that will give me the string with a characters removed.

So it doesn't just work for 3, it works for all positive integers, except if the length of the string is less than or equal to a, in that case it will return a negative number or 0.

Upvotes: 3

Ben Rauzi

Reputation: 604

items.Remove(items.Length - 3)

string.Remove() removes all items from that index to the end. items.length - 3 gets the index 3 chars from the end

Upvotes: 1

Adil

Reputation: 148120

read last 3 characters from string [Initially asked question]

You can use string.Substring and give it the starting index and it will get the substring starting from given index till end.

myString.Substring(myString.Length-3)

Retrieves a substring from this instance. The substring starts at a specified character position. MSDN

Edit, for updated post

Remove last 3 characters from string [Updated question]

To remove the last three characters from the string you can use string.Substring(Int32, Int32) and give it the starting index 0 and end index three less than the string length. It will get the substring before last three characters.

myString = myString.Substring(0, myString.Length-3);

String.Substring Method (Int32, Int32)

Retrieves a substring from this instance. The substring starts at a specified character position and has a specified length.

You can also using String.Remove(Int32) method to remove the last three characters by passing start index as length - 3, it will remove from this point to end of string.

myString = myString.Remove(myString.Length-3)

String.Remove Method (Int32)

Returns a new string in which all the characters in the current instance, beginning at a specified position and continuing through the last position, have been deleted

Upvotes: 331

Mike Lowery

Reputation: 2868

Probably not exactly what you're looking for since you say it's "dynamic data" but given your example string, this also works:

? "abcdxxx".TrimEnd('x');
"abc"

Upvotes: 6

subramanya46

Reputation: 481

Remove the last characters from a string

TXTB_DateofReiumbursement.Text = (gvFinance.SelectedRow.FindControl("lblDate_of_Reimbursement") as Label).Text.Remove(10)

.Text.Remove(10)// used to remove text starting from index 10 to end

Upvotes: 1

lc.

Reputation: 116468

You can use String.Remove to delete from a specified position to the end of the string.

myString = myString.Remove(myString.Length - 3);

Upvotes: 6

Alex

Reputation: 8937

myString = myString.Remove(myString.Length - 3, 3);

Upvotes: 30

Byron Katz

Reputation: 510

I read through all these, but wanted something a bit more elegant. Just to remove a certain number of characters from the end of a string:

string.Concat("hello".Reverse().Skip(3).Reverse());

output:

"he"

Upvotes: 19

Jaidi Wael Leila

Reputation: 101

string test = "abcdxxx";
test = test.Remove(test.Length - 3);
//output : abcd

Upvotes: 8

Frank59

Reputation: 3261

   string myString = "abcdxxx";
   if (myString.Length<3)
      return;
   string newString=myString.Remove(myString.Length - 3, 3);

Upvotes: 2

Freelancer

Reputation: 9074

myString.Substring(myString.Length - 3, 3)

Here are examples on substring.>>

http://www.dotnetperls.com/substring

Refer those.

Upvotes: 2

Shashika Silva

Reputation: 55

str= str.Remove(str.Length - 3);

Upvotes: 3

Adeel

Reputation: 19228

myString.Remove(myString.Length-3);

Upvotes: 14

Remove the last three characters from a string

Answers (17)

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