C# | Método Convert.ToString(String, IFormatProvider)

Este método se utiliza para devolver la instancia de string especificada y no se realiza ninguna conversión real.
Sintaxis:

public static string ToString (String, IFormatProvider);

Parámetros:  

• value : Es la string a devolver.
• proveedor : es un objeto que proporciona información de formato específica de la cultura. Este parámetro se ignora.

Valor devuelto: este método devuelve el valor sin cambios.
Los siguientes programas ilustran el uso del método Convert.ToString(String, IFormatProvider) :
Ejemplo 1: 

// C# program to demonstrate the
// Convert.ToString() Method
using System;
using System.Globalization;
 
class GFG {
 
    // Main Method
    public static void Main()
    {
        try {
 
            // creating object of CultureInfo
            CultureInfo cultures =
              new CultureInfo("en-US");
 
            // declaring and initializing String array
            string[] values = {"amar", "akbar",
                                    "anthony"};
 
            // calling get() Method
            Console.Write("Converted string value"
                  + " from a specified string: ");
 
            for (int j = 0; j < values.Length; j++)
            {
                get(values[j], cultures);
            }
        }
 
        catch (FormatException e)
        {
            Console.WriteLine("\n");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
 
        catch (OverflowException e)
        {
            Console.WriteLine("\n");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
 
    // Defining get() method
    public static void get(string s,
               CultureInfo cultures)
    {
 
        // converting string to specified string
        string val = Convert.ToString(s, cultures);
 
        // display the converted string value
        Console.Write(" {0} ", val);
    }
}

Converted string value from a specified string:  amar  akbar  anthony

Ejemplo 2:

// C# program to demonstrate the
// Convert.ToString() Method
using System;
using System.Globalization;
 
class GFG {
 
    // Main Method
    public static void Main()
    {
        // creating object of CultureInfo
        CultureInfo cultures =
          new CultureInfo("en-US");
 
        // declaring and initializing a String array
        string value = "The Accidental Prime Minister";
 
        // calling get() Method
        Console.Write("Converted String: ");
 
        // converting string to specified string
        string val = Convert.ToString(value, cultures);
 
        // display the converted string value
        Console.Write("{0}", val);
    }
}

Converted String: The Accidental Prime Minister

Referencia: 

• https://docs.microsoft.com/en-us/dotnet/api/system.convert.tostring?view=netframework-4.7.2#System_Convert_ToString_System_String_System_IFormatProvider_