Ow to access property from one class to another class

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namespace Samba.Modules.MenuModule
{
[Export, PartCreationPolicy(CreationPolicy.NonShared)]
public class MenuItemViewModel : EntityViewModelBase, IEntityCreator
{
private readonly IMenuService _menuService;

[ImportingConstructor]
public MenuItemViewModel(IMenuService menuService)
{
AddPortionCommand = new CaptionCommand(string.Format(Resources.Add_f, Resources.Portion), OnAddPortion);
DeletePortionCommand = new CaptionCommand(string.Format(Resources.Delete_f, Resources.Portion), OnDeletePortion, CanDeletePortion);
_menuService = menuService;
}
public string Barcode
{
get { return Model.Barcode ?? ""; }
set { Model.Barcode = value; }
}

====> i have to access this barcode to my class.
my class is

namespace Samba.Presentation.Common.ModelBase
{
public abstract class EntityViewModelBase : VisibleViewModelBase where TModel : class, IEntityClass
{
private bool _modelSaved;
private IValidator _validator;

protected EntityViewModelBase()
{
SaveCommand = new CaptionCommand(Resources.Save, OnSave, CanSave);
}

[Browsable(false)]
public TModel Model { get; set; }

[Browsable(false)]
public ICaptionCommand SaveCommand { get; private set; }
protected virtual void OnSave(string value)
{
if (CanSave())
{
string barcode = "192.0.0.1";
//check if IP is duplicate or not
string constring = LocalSettings.ConnectionString + ";Initial Catalog=sTMS 3;";
SqlConnection con = new SqlConnection();
con.ConnectionString = constring;
SqlCommand check_Item = new SqlCommand("SELECT COUNT(*) FROM MenuItems WHERE (Barcode ='" + barcode + "')", con);
con.Open();
int UserExist = (int)check_Item.ExecuteScalar();

if (UserExist > 0)
{
MessageBox.Show("IP already exsit.Please try again", Resources.CantSave);
ErrorMessage = "";
}
else
{
_modelSaved = true;
if (Model.Id == 0)
{
this.PublishEvent(EventTopicNames.AddedModelSaved);
}
this.PublishEvent(EventTopicNames.ModelAddedOrDeleted);
((VisibleViewModelBase)this).PublishEvent(EventTopicNames.ViewClosed);
}
con.Close();

}

What I have tried:

i have tried many solution n=but because this is non shared class m stuck

Posted 6-Mar-18 1:19am

Member 10235493

Updated 6-Mar-18 2:12am

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OriginalGriff · Answer 1 · 2018-03-06T02:12:00

Because your Barcode property is non-static, you need an instance of the MenuModule class in order to get the value - as each instance will have a different value. You create an instance using the new keyword.

An instance is like a Car - you can have a Car class, and all four-wheeled vehicles are Car instances. In the real world you already know this: "this car" is a different vehicle to "that car"; "my car" is a different colour to "your car". Each car is a separate instance of the class of Cars, and is created, bought, sold, and driven independently of all the others.

Classes in computers are the same: you can have multiple instances of your MenuModule class, and each will have a separate Barcode property value. So you need to specify exactly which instance of the class you are trying to refer to, is all:

C#

MenuModule mm = new MenuModule();
...
Console.WriteLine(mm.Barcode);