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

Last Updated : 11 Jul, 2025

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 in s.

Below programs illustrate the use of Char.IsSurrogate(String, Int32) Method: Example 1: 

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 

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 

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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