C# | Método Char.IsLowSurrogate(String, Int32) – Part 1

Este método se usa para indicar si el objeto Char en la posición especificada en una string es un sustituto bajo o no.

Sintaxis:

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

Parámetros:

s : es una string.

index : Es la posición del carácter a evaluar en s .

Valor devuelto: este método devuelve verdadero si el valor numérico del carácter especificado en el parámetro sU+DC00 va desde hasta , de U+DFFFlo contrario, devuelve falso .

Excepciones:

  • ArgumentNullException: si la s es nula.
  • ArgumentOutOfRangeException: si el índice no es una posición dentro de s .

Los siguientes programas ilustran el uso del método Char.IsLowSurrogate(String, Int32) :

Ejemplo 1:

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

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

Ejemplo 2: para ArgumentNullException

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

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

s is null
Exception Thrown: System.ArgumentNullException

Ejemplo 3: para ArgumentOutOfRangeException

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

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

index is less than zero
Exception Thrown: System.ArgumentOutOfRangeException

Referencia:

Publicación traducida automáticamente

Artículo escrito por RohitPrasad3 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA

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