C# | Char.IsHighSurrogate(String, Int32) Method Last Updated : 07 Sep, 2022 Comments Improve Suggest changes Like Article Like Report 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: csharp // 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}' doesn't contain any High" + "Surrogate value at index {1}", s, i); } } 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 csharp // 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}' doesn't contain any High" + "Surrogate value at index {1}",s, i); } } 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 csharp // 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}' doesn't contain any High" + "Surrogate value at index {1}", s, i); } } 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 Reference: https://docs.microsoft.com/en-us/dotnet/api/system.char.ishighsurrogate?view=netframework-4.7.2#System_Char_IsHighSurrogate_System_String_System_Int32_ Comment More infoAdvertise with us Next Article C# | Char.IsHighSurrogate(String, Int32) Method rohitprasad3 Follow Improve Article Tags : C# CSharp-method CSharp-Char-Struct Similar Reads C# - Char Struct In C#, the Char struct is used to represent a single Unicode character as a UTF-16 code unit, defined under the System namespace. 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