I have to write an inheritance hierarchy for class Quadrilateral, square and rectangle. Use Quadrilateral as base class of the hierarchy.
So for I had this:
Public MustInherit Class Quadrilateral
Public Function getName() As String
Return "Shape"
End Function
I can't seem to make a GUI in the shape a circle...
something other than square/rectangle.
I have put this code in the global form Inherits System.Windows.Forms.Form. And then in the form that will inherit this from the global Inherits MenuStrip. "MenuStrip" is what the global form is called. But keep getting this error: Error1Base class 'MenuStrip' specified for class 'Lesson2' cannot be different from the base class 'System.Windows.Forms.Form' of one of its other partial types.
View 5 RepliesI'm writing a Windows Forms application in VB.Net 2008, .NET Framework 3.5, and I am trying to handle an event created by a class that get's instantiated several times throughout the program. The thing is the events gets fired in the Functions class, but nothing's happening in the main class.I tried to change the called class by instantiating it in the beginning of the main class, by using 'WithEvents testEvent as MTO_Tool.Functions = New Functions' but that also didn't work.
Code:
' The main class:
Public Class MainScreen
WithEvents testEvent As MTO_tool.Functions
Private Sub test() Handles testEvent.SaveChanges
[code]....
how to organize the classes within my RPG project that I'm making. I've tried to implement a battle system but I am not comfortable with my initial results. This is the basic layout I currently have for my classes. [Code] clsCharacter contains statistics pertaining to one character, including magic available to that character to use. Also includes what weapons that character has equipped. clsTeam contains multiple clsCharacter, as well as a list of items that each clsCharacter in the team can use. clsBattle contains two clsTeams. One team is the player and the other is the computer. Now, this is a wonderful way to organize data. However, I see limitations with this approach. For instance, to pass data from Battle to Character, it has to pass through the team class and vice-versa. Plus, if I use Properties, it transfers data as ByVal instead of ByRef, so I cannot guarantee that I'm editing the original and not a copy of the passed object (IIRC)
In addition, I feel it is just messy code to include methods within the clsCharacter class that invoke this: MyTeam.MyBattle.DoAction(). Plus, the clsCharacter might not even be in the battle at the time - I don't won't to bog down that class featuring code that is exclusive for battling when I also need to be concerned about moving around the map, saving/loading data, etc. So, any suggestions? Right now, I'm burnt out of ideas. One idea I have so far is to include a function for the clsCharacter that exports a list of all possible moves the character could make, and if the character is CPU choose the most optimal one, and if Human than wrap it up in some nifty GUI so they can choose what action to take. But at the same time, how do I use that information within the context of the battle?
This is a followup to the question I asked here:
[URL]
I understand the answer in the post above, which is absolutely amazing, by the way. It's about implementing interfaces with a class. However, what if a class needs to share features with another class?Yes, that class can an Interface. However, let's use this sample definition.
[code]...
Or, in other words:An equippable item can perform acts outside of its typical usage of a shield or weapon. But not all items can act as a sheid or weapon.I mean, I could create a class that implements IWeapon, IShield, IMagic, IUseableItem, etc. But there should be a better way than returning NULL when those interfaces are called.
I'm making a custom class that mocks the System.Drawing.Rectangle class because the Rectangle class doesn't have a name property. I need a name property because I am adding all of my rectangles to a collection and I need a little more info stored than just their locale and size. So I changed the _onPaint event but nothing is working out when I run the program?
Public Class Rectanglar : Inherits UserControl
Public BackgroundColor As Color = Color.Blue
Public Sub New(ByVal name As String, ByVal XY As Point, ByVal Widthy As Integer, ByVal Heighty As Integer)
[code].....
i have a class call it clsFamily this class contains properties that make up a family object. This class works fine with no issues. Now i need a new class (called MyAccount) which contains 3 properties, an ID a user name and a clsFamily object. I have declared both classes as Friend from within my globals Module and define the clsFamily as family, however when i try to put this type within my 2nd class i get an error "Type 'family' is not defined" what am i doing wrong? i know i could get it to work fine by adding the ID and User Name properties to the clsFamily object but i need to define this as a new type of object as the ID and User name are not normally part of this class.
View 12 Repliesworking on an implementation of a list control for a card game. The catch is the deck control object. I want it to be reusable for different types of cards, which is wheretuck since I seem to be having some issues.First: The basic card object
Public Class BaseCard
'Properties
Private _Id As Integer
[code]....
I have a base class which defines a shared readonly property like this[code]...
View 5 RepliesI am developing a windows based application in VS2005. I want all my form to be inherits from one of my class e.g.ParentClass but indeed the windows forms already inherits windows.forms.form class. what I have tried is that, I inherit "windows.forms.form" in "ParentClass" and all forms inherits my "ParentClass". But in this case when I view the design of the form IDE gives error.
View 3 RepliesThe test is base on Visual Basic inheritance, need to create a derived class, and identify the inheritance.
View 5 RepliesCan you define this :
Class
Object
Inheritance
Polymorphism
Abstraction
And could you make it easy to understand I'm having a hard time to understand those terms.
Public Class Form1
Private opsets As New List(Of OpSet)
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
opsets.Add(New OpSet(Me, 100, 300))
[code]....
how variables declared with protected access in a base class are used to implement inheritance.
View 1 RepliesI am somewhat new to object oriented programming and am attempting to flatten a Linq object hierarchy by using a shim class.how to initalize a derived class with property values from a base class?I have two objects, a base object with about 100 properties, and a derived object which inherits from the base object and adds a few additional properties beyond those of the base object. My simple constructor creates the derived object, but I am looking for a way to initialize the derived object properties with values from the base object.Right now I am using reflection to iterate over the properties individually and I suspect there may be a better way. The following example shows my shim class constructor for the derived class, and two properties:
newProperty1 - a new string property of the derived class
flattenedProperty2 - a new string property of the derived class, copied from a 2nd-level object of the base class
Code example:
Public Class derivedObj
Inherits baseObj
Private _newProperty1 As String[code].......
Is this the correct constructor approach to flatten the object hierarchy using a shim class? My second question relates to initialization of properties in the derived class. The constructor above creates the derived object, but what is the best way to initialize the derived object properties with values from the base object? The following code uses reflection to iterate over the properties individually, but I suspect there may be a better way.
Code example:
' property names are in the string array fieldNames
'baseObjQuery is an ienumerable of baseObj
'derivedObjList is a list of derivedObj[code].....
Is there a simple way to initialize values for the properties in the derived object based upon the values of the common properties in the base object?
Background:I have a base class and several inherited derived classes. The derived classes don't always need to have the same properties. If any properties are shared among the derived classes, those properties would live at the base class level ('Contents', for example).Similarly, GoodDocument below has 'GoodThings' but would not want/need to have 'BadThings'.I want to treat instances of both 'GoodDocument' and 'BadDocument' as type 'Document'
public mustinherit class Document
public property Contents as string
public sub new()...
[code]....
I am cleaning up some code and I have multiple classes that are 99% exactly the same. So my understanding is that my options are...
1. Create a class and all other classes inherit from it and modify it a bit
2. Create an abstract class and all classes inherit from it and modify a bit ** I took this route
3. Create an interface and all classes Implement that interface.
Here is my 'original' class below (the one that all of them look 99% identical). This class is used in an arraylist so I have a listing of all my images from a folder I have searched.
[Code]...
I tried it and get an error but maybe I'm tring the wrong way. Can a usercontrol inherate an application defined class ie.. could you inheritance a classic rect class into a user control to add the hight and width properties to the control without having to do all the coding all over again? Currently I just declair a private instance of the class within the control and then encapsalate. It would be nice if I could just inherit all the functionality of my classes into controls designed to implament the classes.
View 1 Repliesi've got a little problem with List(on T) variables.
[code]...
It works perfectly fine. Does anyone know what the problem is?
i had a class called Tag with a structure like:
public class Tag
private _members
public properties
public shared database_methods
end class
this class was tailored for mysql database. i'm currently adding access 2007 support so i split tag into tag and tagdata with structures like:
[Code]...
Given a rectangle of width w and height h. and a coordinate x,y in that rectangle I would like to identify which triangle I am within.
i.e. the function should take parameters(x,y) and return a,b,c,d or a zero based number representing that triangle index i.e. (0=A,1=B,2=C,3=D) if they are in that order.
I think this would be something like >= the formula of the red line and >= the formula of the green line?
I'd like to implement this in VB.NET
This code is to draw rectangle. How can I draw rectangle divided to four rectangle or more
e.Graphics.DrawRectangle(Pens.Coral, 50, 200, 30, 40)
I'M creating a kind of photo viewer, and I cannot figure out how to orient the scroll buttons with the photos I want to draw because they all are different sizes.This is really hard to explain so please ask questions if you don't understand.I'M thinking if i could draw every photo on a single rectangle and then the scroll bars will position that rectangle up or down. but is there a way to make a rectangle inside another one so it only shows inside that rectangle?
View 10 RepliesI am a beginner for using VB.NET. I have a problem in which we have several "Program", each "Program" has N "group", and each group has N "unit", shown as follows. i need to link "Program" and the corresponding "group" and "unit" together. First , the properties of lower layer depends on upper layer's properties. Second, If i delete one "Program", the cooresponding "group" and "unit" will be deleted as well.
[Code]...
I have created a set of classes that represent an hierarchySo when I reference like this:
Dim alldeals as deals
alldeals.Deal(5).DealSlot(3).SlotType= "SomeType"
alldeals.Deal(5).DealSlot(4).SlotType= "SomeOtherType"
[code].....
I am working through my Visual Basic Book 2010 book and came across this Program example:Create 3 classes that inherit from a base class named Shape. The Shape class has an instance variable that is the name of the shape and also a CalcArea() function that must be overridden by each subclass. You will need to create the following 3 classes and use the formulas provided to calculate the areas.
Square � Area = sideLength * sideLength
Circle � Area = pi * radius * radius (use Math.Pi for the value of pi)
Triangle � Area = � * base * height
Each subclass should have a constructor that you use to set the name and the attributes required to calculate the area with. Each subclass should also override the CalcArea() function that is provided in the base class Shape. They will also need to implement the toString() method that will print out the shape name, any attributes (ex: sideLength), and the area.It also includes the Shape base class. You will need to add the 3 subclasses and add the appropriate code.
I'm looking for advice to make my code efficient in terms of execution speed and memory usage. Basically, how to lay out my objects. The program displays parts of several data series in bar- or line- charts, as well as calculated series based on these data series. The key user input will be to change what part of data series to look at, and that input should trigger instant chart update, with minimal lag.
[Code]...
I could put a Textbox in a Panel then that panel is placed in a TabPage, how do I go out going through the hierarchy of the Textbox parent until reaching the TabPage? My purpose for this is if I want to focus on a Textbox then of course I would have to also select the TabPage where it is located, is there an easier way than what I am planning to do?
View 3 RepliesI am working on an opening search screen for a program that grabs information on a file for the user. Subfolders are defined by periods so some possible files include
FolderA.SubFolder1.SetupX.txt
FolderB.SubFolder2.SetupY.txt
FolderB.SetupX.txt
FolderA.SubFolder1.SetupZ.txt
When the search button is clicked all of these are populated into a list box currently using the following function's
[Code]...
The problem is that subfolders will continue to be created with unknown names. I'm thinking I need to use some sort of loop that counts the number of periods and then compares the directories using some sort of negative lookahead to group them. Im still unsure how I'll make it so Clicking Setup Y and hitting OK will be able to maintain that I am opening FolderB.Subfolder2.SetupY.txt and not just SetupY.txt