C# String - Trim() Method

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The C# String Trim() method is used to return a string after the trimming all the leading and trailing white space characters or (specified character) from a string. This method does not modified the original string but returns a new string with the changes.

Syntax

Following are the syntax of the C# string Trim() method −

Default Syntax −

This syntax of the Trim method removes all leading and trailing white-space characters from the current string.

public string Trim();

Parametrised Syntax −

This syntax of the Trim method removes all leading and trailing occurrences of the specified characters from the string.

public string Trim(params char[]? trimChars);

Parameters

This method accepts the following parameters −

• trimChars: This is an array of Unicode characters to remove, or null.

Return Value

This method returns a string that remains after all occurrences of the characters in the trimChars parameter have been removed from the start and end of the current string.

Example 1: Removing Leading and trailing WhiteSpace

Following is a basic example of the Trim() method to remove leading and trailing white space characters from the current instance of string −

    
using System;
class Program {
   static void Main() {    
      string str = "   Hii, tutorialspoint!   ";
      string trimmedStr = str.Trim();

      Console.WriteLine($"Original: '{str}'");
      Console.WriteLine($"Trimmed: '{trimmedStr}'");
   }
}

Output

Following is the output −

Original: '   Hii, tutorialspoint!   '
Trimmed: 'Hii, tutorialspoint!'

Example 2: Trimming Specific Characters

Let's look at another example. Here, we use the parametrized Trim() method to remove the specified special character from the current string −

using System;
class Program {
   static void Main() {
      string str = "!!Hello, tutorialspoint!!";
      string trimmedStr = str.Trim('!', ',');
      
      Console.WriteLine($"Original: '{str}'");
      Console.WriteLine($"Trimmed: '{trimmedStr}'");
   }
}

Output

Following is the output −

Original: '!!Hello, tutorialspoint!!'
Trimmed: 'Hello, tutorialspoint'

Example 3: Sanitizing User Input

In this example, we use the Trim() method to sanitize user input by removing or modifying unsafe characters from user input before being used in an application −

using System;
class Program {
   public static void Main() {
      string userInput = "  admin  ";
      if (userInput.Trim() == "admin") {
         Console.WriteLine("Valid input"); 
      }
      else{
         Console.WriteLine("Invalid Input");
      }
   }
}

Output

Following is the output −

Valid input

Example 4: Check for White-space or Specified Characters

The below example, checks if a string contains white-space or specified characters before trimming it −

using System;
class Program {
   static void Main() {
      string str = "   tutorialspoit, Hello, World!!   ";
      
      // Check for whitespace
      if (str.Contains(' ')) {
         Console.WriteLine("The string contains whitespace.");
      }

      // Check for specific characters (e.g., '!' or ',')
      if (str.Contains('!') || str.Contains(',')) {
         Console.WriteLine("The string contains '!' or ',' characters.");
      }

      // Trim whitespace and specified characters
      string trimmedStr = str.Trim('!', ' ');

      Console.WriteLine($"Original String: '{str}'");
      Console.WriteLine($"Trimmed String: '{trimmedStr}'");
   }
}

Output

Following is the output −

The string contains whitespace.
The string contains '!' or ',' characters.
Original String: '   tutorialspoit, Hello, World!!   '
Trimmed String: 'tutorialspoit, Hello, World'