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:
// 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); } } |
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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
// 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); } } |
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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
// 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); } } |
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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:
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