Char.IsWhiteSpace() Method in C#

The Char.IsWhiteSpace() method in C# is used to determine whether a specified Unicode character is classified as white space. This includes spaces, tabs, line feeds, carriage returns, and other Unicode whitespace characters.

Syntax

Following is the syntax for the Char.IsWhiteSpace() method −

public static bool IsWhiteSpace(char ch);

Parameters

• ch − The Unicode character to evaluate.

Return Value

Returns true if the character is a whitespace character; otherwise, false.

Using IsWhiteSpace() with Different Characters

Example

using System;

public class Demo {
   public static void Main() {
      bool res;
      char val = ' ';
      Console.WriteLine("Value = '" + val + "'");
      res = Char.IsWhiteSpace(val);
      Console.WriteLine("Is the value whitespace? = " + res);
   }
}

The output of the above code is −

Value = ' '
Is the value whitespace? = True

Using IsWhiteSpace() with Non-Whitespace Characters

Example

using System;

public class Demo {
   public static void Main() {
      bool res;
      char val = 'k';
      Console.WriteLine("Value = " + val);
      res = Char.IsWhiteSpace(val);
      Console.WriteLine("Is the value whitespace? = " + res);
   }
}

The output of the above code is −

Value = k
Is the value whitespace? = False

Testing Multiple Whitespace Characters

Example

using System;

public class Demo {
   public static void Main() {
      char[] testChars = {' ', '\t', '<br>', '\r', 'A', '5', '@'};
      
      Console.WriteLine("Testing various characters:");
      foreach (char ch in testChars) {
         string displayChar = ch == '\t' ? "\t" : 
                              ch == '<br>' ? "\<br>" : 
                              ch == '\r' ? "\r" : ch.ToString();
         
         Console.WriteLine($"'{displayChar}' is whitespace: {Char.IsWhiteSpace(ch)}");
      }
   }
}

The output of the above code is −

Testing various characters:
' ' is whitespace: True
'\t' is whitespace: True
'<br>' is whitespace: True
'\r' is whitespace: True
'A' is whitespace: False
'5' is whitespace: False
'@' is whitespace: False

Common Use Cases

The Char.IsWhiteSpace() method is commonly used for:

• String parsing − Skipping whitespace characters while processing text.

• Input validation − Checking if user input contains only whitespace.

• Text formatting − Identifying whitespace for custom trimming operations.

Conclusion

The Char.IsWhiteSpace() method provides a reliable way to identify Unicode whitespace characters including spaces, tabs, and line breaks. It returns true for whitespace characters and false for all other characters, making it essential for text processing and validation tasks.