C# | Char.IsSurrogate(String, Int32) Method

This method is used to indicates whether the character at the specified position in a specified string has a surrogate code unit or not.

Syntax:

public static bool IsSurrogate (string s, int index);

Parameters:

s: It is a String.

index: It is the character position to evaluate in s.

Return Value: This method returns true if the character at position index in s is either a high surrogate or a low surrogate 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 inn s.

Below programs illustrate the use of Char.IsSurrogate(String, Int32) Method:

Example 1:

filter_none

edit
close

play_arrow

link
brightness_4
code

// C# program to demonstrate
// Char.IsSurrogate(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);
  
            // declaring and initializing string s1
            string s1 = new String(new char[] {'a',
                        '\uD800', '\uDC00', 'z' });
            check(s1, 2);
        }
        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
        bool val = Char.IsSurrogate(s, i);
  
        // checking
        if (val)
            Console.WriteLine("String '{0}' contains "
               + "Surrogate value at index {1} ",s, i);
                                
        else
            Console.WriteLine("String '{0}' does't contain any"
                        + "Surrogate value at index {1}",s, i);
                                
    }
}

chevron_right






                        filter_none









Output:


String '1234' does't contain anySurrogate value at index 3
String 'Tsunami' does't contain anySurrogate value at index 3
String 'psyc0lo' does't contain anySurrogate value at index 4
String 'að??z' contains Surrogate value at index 2





Example 2: For ArgumentNullException











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// C# program to demonstrate 


// Char.IsSurrogate(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); 


  


            // declaring and initializing string s1 


            string s1 = new String(new char[] { 'a', 


                         '\uD800', '\uDC00', 'z' }); 


  


            check(s1, 2); 


  


            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 


        bool val = Char.IsSurrogate(s, i); 


  


        // checking 


        if (val) 


            Console.WriteLine("String '{0}' contains "


               + "Surrogate value at index {1} ",s, i); 


                                


        else


            Console.WriteLine("String '{0}' does't contain any"


                       + "Surrogate value at index {1}",  s, i); 


                              


    } 


} 



















                        chevron_right







                        filter_none









Output:


String '1234' does't contain anySurrogate value at index 3
String 'Tsunami' does't contain anySurrogate value at index 3
String 'psyc0lo' does't contain anySurrogate value at index 4
String 'að??z' contains Surrogate value at index 2 

s is null
Exception Thrown: System.ArgumentNullException





Example 3: For ArgumentOutOfRangeException











                                    filter_none




                                    edit

                                    close




                                    play_arrow




                                    link

                                    brightness_4

                                    code
                                




















// C# program to demonstrate 


// Char.IsSurrogate(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); 


  


            // declaring and initializing string s1 


            string s1 = new String(new char[] {'a',  


                        '\uD800', '\uDC00', 'z' }); 


            check(s1, 2); 


  


            Console.WriteLine(""); 


            Console.WriteLine("index is less than zero"); 


            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 


        bool val = Char.IsSurrogate(s, i); 


  


        // checking 


        if (val) 


            Console.WriteLine("String '{0}' contains "


              + "Surrogate value at index {1} ",  s, i); 


                               


        else


            Console.WriteLine("String '{0}' does't contain any"


                       + "Surrogate value at index {1}", s, i); 


                                


    } 


} 



















                        chevron_right







                        filter_none









Output:


String '1234' does't contain anySurrogate value at index 3
String 'Tsunami' does't contain anySurrogate value at index 3
String 'psyc0lo' does't contain anySurrogate value at index 4
String 'að??z' contains Surrogate value at index 2 

index is less than zero
Exception Thrown: System.ArgumentOutOfRangeException





Reference:






    

        My Personal Notes
        arrow_drop_up
    

    

        
        

            
            
        

    


Recommended Posts:
RohitPrasad3
Check out this Author's contributed articles.
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on  the "Improve Article" button below.


					
		

    Article Tags : 
C#

           	
        

         

         
 
         
        Be the First to upvote.

                

        



        
        
        
        
        

    

            

            0
            

            

                             No votes yet.
                    

            
            
            
            
            
        

        
        

        

        

        

        

        

        


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.