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

This method is used to indicates whether the Char object at the specified position in a string is a high surrogate or not.

Syntax:

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

Parameters:



s: It is a String.

index: It is the character position in s.

Return Value: This method returns true if the numeric value of the specified character in the s parameter ranges from U+D800 through U+DBFF; otherwise it returns false.

Exceptions:

  • ArgumentNullException: If the s is null.
  • ArgumentOutOfRangeException: If the index is not a position within s.

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

Example 1:

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// C# program to demonstrate the 
// Char.IsHighSurrogate(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, 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 IsHighSurrogate() Method
        bool val = Char.IsHighSurrogate(s, i);
  
        // checking
        if (val)
  
            Console.WriteLine("String '{0}' contains High "
                  + "Surrogate value at index {1} ", s, i);
        else
          Console.WriteLine("String '{0}' does't contain any High"
                          + "Surrogate value at index {1}", s, i);
                                
    }
}

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Output:


String '1234' does't contain any HighSurrogate value at index 3
String 'Tsunami' does't contain any HighSurrogate value at index 3
String 'psyc0lo' does't contain any HighSurrogate value at index 4
String 'að??z' contains High Surrogate value at index 1





Example 2: For ArgumentNullException 











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// C# program to demonstrate the  


// Char.IsHighSurrogate(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); 


            Console.WriteLine(""); 


            Console.WriteLine("s is null"); 


            check(null, 4); 


  


            // declaring and initializing string s1 


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


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


            check(s1, 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 IsHighSurrogate() Method 


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


  


        // checking 


        if (val) 


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


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


                                


        else


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


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


                                


    } 


} 



















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Output:


String '1234' does't contain any HighSurrogate value at index 3
String 'Tsunami' does't contain any HighSurrogate value at index 3
String 'psyc0lo' does't contain any HighSurrogate value at index 4

s is null
Exception Thrown: System.ArgumentNullException





Example 3: For ArgumentOutOfRangeException 











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// C# program to demonstrate the  


// Char.IsHighSurrogate(String,  


// Int32) Method 


using System; 


  


class GFG { 


  


    // Main Method 


    public static void Main() 


    { 


        try { 


  


            // calling check() Method 


            check("1234", 3); 


            check("Tsunami", 3); 


  


            // declaring and initializing string s1 


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


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


            check(s1, 1); 


  


            Console.WriteLine(""); 


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


            check("fjsjsj", -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 IsHighSurrogate() Method 


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


  


        // checking 


        if (val) 


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


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


                               


        else


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


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


                               


    } 


} 



















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Output:


String '1234' does't contain any HighSurrogate value at index 3
String 'Tsunami' does't contain any HighSurrogate value at index 3
String 'að??z' contains High Surrogate value at index 1 

index is less than zero
Exception Thrown: System.ArgumentOutOfRangeException





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