C# String Trim()

The Trim() method removes any leading (starting) and trailing (ending) whitespaces from the specified string.

Example

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
  
      string text = "    Ice cream   ";

// trims leading and trailing whitespaces string s1 = text.Trim();
Console.WriteLine(s1); Console.ReadLine(); } } } // Output: Ice cream

Trim() Syntax

The syntax of the string Trim() method is:

Trim(params char[]? trimChars)

Here, Trim() is a method of class String.


Trim() Parameters

The Trim() method takes the following parameter:

  • trimChars - an array of characters to remove

Trim() Return Value

The Trim() method returns:

  • a string with leading and trailing whitespace or specified characters removed

Note: In programming, whitespace is any character or series of characters that represent horizontal or vertical space. For example: space, newline \n, tab \t, vertical tab \v etc.


Example 1: C# String Trim()

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
  
      string text1 = "\n\n\n Ice\ncream  \n\n";
      string text2 = "\n\n\n Chocolate  \n\n";

// trims leading and trailing whitespaces string s1 = text1.Trim();
Console.WriteLine(s1);
// trims leading and trailing whitespaces string s2 = text2.Trim();
Console.WriteLine(s2); Console.ReadLine(); } } }

Output

Ice
cream
Chocolate

Here,

  • text1.Trim() returns:
Ice
cream
  • text2.Trim() returns:
Chocolate

As you can see from the above example, the Trim() method only removes the leading and trailing whitespace. It doesn't remove whitespaces that appear in the middle.


Example 2: C# String Trim() - Trim Characters

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
     
      // chars to trim
      char[] charsToTrim = {'(', ')', '^'};

      string text = "(^^Everyone loves ice cream^^)";
      Console.WriteLine("Before trim: " + text);

// trims leading and trailing specified chars string s1 = text.Trim(charsToTrim);
Console.WriteLine("After trim: " + s1); Console.ReadLine(); } } }

Output

Before trim: (^^Everyone loves ice cream^^)
After trim: Everyone loves ice cream

Here, we have used the Trim() method to remove leading and trailing '(', ')', and '^' characters.

Note: To remove whitespaces or characters between words in a string, you must use Regular Expressions.


Example 3: C# String TrimStart() and TrimEnd()

using System;  
namespace CsharpString {  
  class Test {
    public static void Main(string [] args) {
     
      string text = "  Everyone loves ice cream  \n\n";
      string result;
      
// trims starting whitespace result = text.TrimStart();
Console.WriteLine(result);
// trims ending whitespace result = text.TrimEnd();
Console.WriteLine(result); Console.ReadLine(); } } }

Output

Everyone loves ice cream


  Everyone loves ice cream

Here,

  • text.TrimStart() - removes starting whitespaces
  • text.TrimEnd() - removes ending whitespaces
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