property collection

Question

1.00/5 (1 vote)

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We have two classes.

first class:

Public Class HeaderInvoice

    Dim _ID As String
    Dim _Rate As Decimal
    Dim _Items As List(Of Item)

    Property ID() As Integer
        Get
            Return _ID
        End Get
        Set(ByVal value As Integer)
            _ID = value
        End Set
    End Property

    Property Rate() As Decimal
        Get
            Return _Rate
        End Get
        Set(ByVal value As Decimal)
            _Rate = value
        End Set
    End Property


    Property Items() As List(Of Item)
        Get
            Return _Items
        End Get
        Set(ByVal value As List(Of Item))
            _Items = value
        End Set
    End Property

End Class

second class:

Public Class Item

    Dim _Id As Integer
    Dim _Price As Decimal

    Property ID() As Integer
        Get
            Return _Id
        End Get
        Set(ByVal value As Integer)
            _Id = value
        End Set
    End Property

    Property Price() As String
        Get
            Return _Price
        End Get
        Set(ByVal value As String)
            _Price = value
        End Set
    End Property

    ReadOnly Property LocalPrice() As Decimal
       Get
***********
       End Get

    End Property
End Class

My question is how to get the value of rate from class HeaderInvoice to calculate the property local price?
Note: I do not have permission to insert property rate in Items Class.
Can anyone can help me?

Posted 25-Nov-10 1:27am

MustafaJuma

Updated 25-Nov-10 3:09am

JF2015

v2

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Comments

fjdiewornncalwe 25-Nov-10 8:02am

OK.. You have shown us your portions of your class definitions and that is great, but we need to know you you are implementing the HeaderInvoice and Item classes in order to explain how to do what you want to do.

#realJSOP 29-Nov-10 7:56am

Why did you low-vote the answers supplied? You asked for a solution, and you got two viable ones from highly reputable users. This is not going to convince others to help you in the future.

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Not Active · Answer 1 · 2010-11-25T05:06:00

If the LocalPrice is dependent on Rate then it should be a property of the Item class not the Header

Think about it a little. With your code you can have something like this

HeaderInvoice hi = new HaderInvoice();
List<Item> items = new List<Item>();
Item item1 = new Item();
item1.ID = 1;
item1.Price = "5.00";
items.Add(item1);
hi.Items = items;

You are expecting to be able to do this.

Decimal rate = hi.Items[0].LocalRate;

item1 doesn't know it in a collection. items doesn't know it is in a HeaderInvoice object. And hi doesn't know that it has any items.
You can still have one rate in the HeaderInvoice object by having it implement IList and override the Add method, something like this

private List<Item> m_Items;
public override int Add(Item item)
{
   if(item.Rate == 0)
   {
     item.Rate = this.Rate;
   }
   m_Items.Add(item);
}

This also allows for each item to override the rate which is a better design.
Also, if you are expecting to use Price in a calculation it should not be a string. Use a double.

#realJSOP · Answer 2 · 2010-11-29T01:57:00

Solution 3

Okay, you didn't like the last answer, so try this one.

Use a delegate, and just pass in each items price along with the invoice's rate to that delegate.

I'm not going to bother giving you sample code because you obviously don't seem to need it, and I have better things to do.

Posted 29-Nov-10 1:57am

#realJSOP

Updated 29-Nov-10 1:58am

v2

#realJSOP · Answer 3 · 2010-11-27T03:01:00

The LocalPrice property doesn't mean anything if it doesn't know the rate. According to you, you can't put the rate into the Item class, so you either have to calculate it in the Invoice object:

VB

public class HeaderInvoice
    public function CalcLocalPrice(index as integer) as decimal
        dim localPrice as decimal = 0
        if (index >= 0 AndAlso index < me.Count) then
            loaclPrice = me[index].Price * rate)
        end if
        return localPrice
    end function
end class

...or you have to create a method in the Item class that calculates it based on the rate supplied to the method.

VB

public class Item
    public function CalcLocalPrice(rate as decimal) as decimal
        return (me.Price * rate)
    end function
end class

property collection

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