How to implement a singleton class in C # Windows Forms to store data in a list

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How to implement a singleton class in C # Windows Forms to store data in a list

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#1 by (1 votes)
#2 by (0 votes)

2

Implement the following classes:

Singleton class named AlmacenDatos with read-only properties to store the list of: Ejecutivos
Use the singleton class in data manipulation.

Add 2 objects through one of the properties of the singleton class created.

Display the information of the objects contained in the list The code of my executive class is the following:

public class ClassEjecutivo
{
    //propiedades
    public ClassSucursal SucursalDeAdscripcion;
    public string Nombre;// { set; get; }
    public string Apellidos;// { set; get; }
    public string Domicilio; //{ set; get; }
    public string Localidad; //{ set; get; }
    public string Municipio; //{ set; get; }
    public string Estado; // { set; get; }
    public string CURP; //{ set; get; }
    public string RFC; //{ set; get; }
    public string Telefono1; //{ set; get; }
    public string Telefono2; // { set; get; }
    public string Cargo; // { set; get; }

}

and my other class is called DatosAplicacion , which is where I store my executive class list:

public class DatosAplicacion
{
   static List<ClassSucursal> listaSucursales = new List<ClassSucursal>();

    public static List<ClassSucursal> Sucursales()
    {
        return listaSucursales;
    }

    public static ClassSucursal AgregarSucursal (ClassSucursal item)
    {
        listaSucursales.Add(item);
        return item;
    }

c#

asked by Ángel Luis 14.09.2016 в 05:59

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2 answers

Using Ninjet to do the injection Is there an equivalent to lastInsertId () for an UPDATE?

score 1 · Answer 1

If you want to use the pattern in your classes the following code can help you:

public class classToInstance
{
    private classToInstance() { }
    private static classToInstance _instance;
    public static classToInstance Instance
    {
        get
        {
            if (_instance == null)
                _instance = new classToInstance();
            return _instance;
        }
    }

    public void Method()
    {
        //TO DO
    }
}

Where you can use the instantiated class directly, you can use it in the following way:

classToInstance.Instance.Method();

In this way, you will always be using a single instance of the class in the code that is currently running.

score 0 · Answer 2

Here I publish an idea that may help you.

public class AlmacenDatos
{
  private static AlmacenDatos _instancia;
  private List<ClassEjecutivo> ejecutivos;

  private AlmacenDatos()
  {
    ejecutivos = new List<ClassEjecutivo>();
  }

  public static getInstancia()
  {
    return _instancia?? (_instancia= new AlmacenDatos()); ;
  }
  //enviar un id único para diferenciar a cada ejecutivo
  public ClassEjecutivo getEjecutivo(string RFCparam)
  {
    foreach(ClassEjecutivo e in ejecutivos)
    {
      if (e.RFC == RFCparam)
        return e;
    }
    return null;
  }
}