Created
June 3, 2014 23:57
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Demostración de los operadores as, is, typeof, y el método GeType en C#.
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using System; | |
using System.IO; | |
namespace Recetas.Cap03 | |
{ | |
internal class Aplicacion | |
{ | |
public static void Main() | |
{ | |
Console.WriteLine(); | |
// Create un nuevo objeto de `StringReader`: | |
Object objeto = new StringReader("Blog xCSw"); | |
// Comprueba si `objeto` es de tipo StringReader: | |
if (typeof (StringReader) == objeto.GetType()) | |
{ | |
Console.WriteLine("Uso operador typeof: `objeto` es de tipo `StringReader`."); | |
} | |
// Comparación con el operador is: | |
// ¿`objeto` deriva de `TextReader`?: | |
if (objeto is TextReader) | |
{ | |
Console.WriteLine("Uso método GetType: `objecto` es de tipo `TextReader` o clase derivada."); | |
} | |
// Usamos GetType para comprobar si `objecto` es de tipo | |
// System.IO.TextReader: | |
if (EsTipoDe(objeto, "System.IO.TextReader")) | |
{ | |
Console.WriteLine("Uso operador is: `objecto` es de tipo `TextReader`"); | |
} | |
// Uso de operador as: | |
StringReader lector = objeto as StringReader; | |
if ( lector != null) | |
{ | |
Console.WriteLine("Uso operador as: `objecto` es de tipo `StringReader`"); | |
} | |
Console.WriteLine(); | |
} | |
///<summary> | |
/// Comprueba si un objeto ese instancia de un tipo. | |
///</summary> | |
///<param value="obj">Instancia de un objeto.</param> | |
///<param value="tipo">Nombre del tipo</param> | |
public static bool EsTipoDe(object obj, string tipo) | |
{ | |
Type t = Type.GetType(tipo, true, true); | |
return t == obj.GetType() || obj.GetType().IsSubclassOf(t); | |
} | |
} | |
} |
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