How to use values from child class in parent class? vb.net
I have a problem that disappoints me to the end, I have an overridden function in the parent class and an override function in the child class, like below:
subclass
Public Overrides Sub UpdatePrice(ByVal dblRetailPrice As Double)
If dblWholesalePrice < 0 Then
MessageBox.Show("Error, amount must be greater than 0.")
Else
dblRetailPrice = dblWholesalePrice * dblStandardMargin
End If
End Sub
and in the parent class, I
Public ReadOnly Property RetailPrice() As Double
Get
Return dblRetailPrice
End Get
End Property
Public Overridable Sub UpdatePrice(ByVal dblRetailPrice As Double)
If dblWholesalePrice < 0 Then
MessageBox.Show("Please input an amount greater than 0,wholesale price has not changed", "error")
Else
dblRetailPrice = 1.1 * dblWholesalePrice
End If
End Sub
When I debug the value is generated, but it does not carry over to the parent class ski.RetailPrice (), which seems to be the problem here? Any help would be greatly appreciated.
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You should not pass a parameter with the same name as a class level variable in a higher scope. A local variable will override another, which means that this statement in your setter:
dblRetailPrice = 1.1 * dblWholesalePrice
will set the value of the temporary parameter dblRetailPrice
you just passed, not a member variable dblWholesalePrice
at the class level.
A simple solution is to change the parameter name by dropping the useless type notation prefix:
Public Class MyClass
Protected dblRetailPrice As Double
Public ReadOnly Property RetailPrice() As Double
Get
Return dblRetailPrice
End Get
End Property
Public Overridable Sub UpdatePrice(ByVal retailPrice As Double)
If dblWholesalePrice < 0 Then
MessageBox.Show("Please input an amount greater than 0,wholesale price has not changed", "error")
Else
dblRetailPrice = 1.1 * dblWholesalePrice
End If
End Sub
End Class
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