C# | Char.IsControl(String, Int32) Method
This method is used to indicates whether the character at the specified position in a specified string is categorized as a control character.
Syntax:
public static bool IsControl (string s, int index);
Parameters:
s: It is the String.
index: It is the character position in s.
Return Value: This method returns true if the character at position index in s is a control character otherwise it returns, false.
Exceptions:
- ArgumentNullException: If the s is null.
- ArgumentOutOfRangeException: If the index is less than zero or greater than the last position in s.
Note: Control characters are formatting and other non-printing characters, such as ACK, BEL, CR, FF, LF, and VT
.
Below programs illustrate the use of Char.IsControl(String, Int32) Method:
Example 1:
// C# program to demonstrate the // Char.IsControl(String, Int32) // Method using System; class GFG { // Main Method public static void Main() { try { // calling check() Method check( "1234" , 3); check( "Tsunami" , 3); check( "psyc0lo" , 4); check( "a" + Environment.NewLine + "b" , 1); } catch (ArgumentNullException e) { Console.Write( "Exception Thrown: " ); Console.Write( "{0}" , e.GetType(), e.Message); } catch (ArgumentOutOfRangeException e) { Console.Write( "Exception Thrown: " ); Console.Write( "{0}" , e.GetType(), e.Message); } } // Defining check() method public static void check( string s, int i) { // checking condition // using GetNumericValue() Method bool val = Char.IsControl(s, i); // checking if (val) Console.WriteLine( "Control character \\U{0} " + "found in position {1}." , Convert.ToInt32(s[i]).ToString( "X4" ), i); else Console.WriteLine( "String '{0}' does't contain control " + "character at index {1}" , s, i); } } |
Output:
String '1234' does't contain control character at index 3 String 'Tsunami' does't contain control character at index 3 String 'psyc0lo' does't contain control character at index 4 Control character \U000A found in position 1.
Example 2: For ArgumentNullException
// C# program to demonstrate the // Char.IsControl(String, Int32) // Method using System; class GFG { // Main Method public static void Main() { try { // calling check() Method check( "1234" , 3); check( "psyc0lo" , 4); check( "a" + Environment.NewLine + "b" , 1); Console.WriteLine( "" ); Console.WriteLine( "s is null" ); check( null , 4); } catch (ArgumentNullException e) { Console.Write( "Exception Thrown: " ); Console.Write( "{0}" , e.GetType(), e.Message); } catch (ArgumentOutOfRangeException e) { Console.Write( "Exception Thrown: " ); Console.Write( "{0}" , e.GetType(), e.Message); } } // Defining check() method public static void check( string s, int i) { // checking condition // using GetNumericValue() Method bool val = Char.IsControl(s, i); // checking if (val) Console.WriteLine( "Control character \\U{0} found" + " in position {1}." , Convert.ToInt32(s[i]).ToString( "X4" ), i); else Console.WriteLine( "String '{0}' does't contain " + "control character at index {1}" , s, i); } } |
Output:
String '1234' does't contain control character at index 3 String 'psyc0lo' does't contain control character at index 4 Control character \U000A found in position 1. s is null Exception Thrown: System.ArgumentNullException
Example 3: For ArgumentOutOfRangeException
// C# program to demonstrate the // Char.IsControl(String, Int32) // Method using System; class GFG { // Main Method public static void Main() { try { // calling check() Method check( "1234" , 3); check( "psyc0lo" , 4); check( "a" + Environment.NewLine + "b" , 1); Console.WriteLine( "" ); Console.WriteLine( "index is less than zero" ); check( "null" , -1); } catch (ArgumentNullException e) { Console.Write( "Exception Thrown: " ); Console.Write( "{0}" , e.GetType(), e.Message); } catch (ArgumentOutOfRangeException e) { Console.Write( "Exception Thrown: " ); Console.Write( "{0}" , e.GetType(), e.Message); } } // Defining check() method public static void check( string s, int i) { // checking condition // using GetNumericValue() Method bool val = Char.IsControl(s, i); // checking if (val) Console.WriteLine( "Control character \\U{0} found " + "in position {1}." , Convert.ToInt32(s[i]).ToString( "X4" ), i); else Console.WriteLine( "String '{0}' does't contain control" + " character at index {1}" , s, i); } } |
Output:
String '1234' does't contain control character at index 3 String 'psyc0lo' does't contain control character at index 4 Control character \U000A found in position 1. index is less than zero Exception Thrown: System.ArgumentOutOfRangeException
Reference: