Convert From Base Class To Subclass (BC30311: "Value Of Type '<type1>' Cannot Be Converted To '<type2>'")

Nov 16, 2009

take a look at the following code:

[Code]...

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.net - Get A Base Class Method Return Type To Be The Subclass Type?

Nov 23, 2009

I have a copy function that I'd like to override in subclasses to return the type of the subclass. Here are my interfaces:

Public Interface IBase(Of T)
Function Copy() As T
End Interface

[Code]....

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Convert Object Of Type1 To Another Object Of Type2

Jul 19, 2010

In Visual Studio 2008 vb.net i have created a windows forms application containing 2 web references: wr1 and wr2.

wr1 contains a public class "Person" and wr2 also contains a public class "Person". They both have exactly the same properties.

What i would like to achieve is to convert an object of type wr1.person to wr2.person. Something like this:

dim p1 as wr1.person
p1 = wr1.GetPerson(123)
dim p2 as wr2.person
p2 = p1
wr2.AddPerson(p2)

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VS2008/VB: Moving Subclass VB Code To Inherited Base Class - Where Should Variables/objects Be Declared

Jun 3, 2009

In re-engineering a windows forms application, I find that a lot of code-behind in the various form classes is duplicative and I'm trying to centralize as many procedures as possible into a base class which can be inherited and used by the subclassed forms.

This process seems to be going well and is making the code in my subclasses much simpler and hopefully easier to maintain, but I'm not sure where to draw the line between leaving code in the subclasses and engineering for generic resusability and moving it to the base class.

Specifically, in some subclasses I have code which manipulates variables and objects specific to the subclass, and although I could move the code-behind into the base class, the base class code references specific objects which are needed to compile. For example, each subclass manipulates a databound datagridview and form detail controls which allows the user to select between multi-record and detailed single-record views of a datatable.

In Visual Basic 2008 do I need to declare dummy data objects in the base class so that the base class will compile? Or is there a way to indicate that the data objects will be provided by the subclass?

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Returning A Inherited Class As Base Class Type With Web Services?

Sep 25, 2009

I suspect I am being very silly here but I have the following setup

Class MustInherit myBaseClass
'some stuff
End Class
Class myInheritedClassA

[code]....

Running this results in the following error

Unhandled Exception: System.InvalidOperationException:
There was an error generating the XML document. --->
System.InvalidOperationException:

[code]....

is there any way of 'Widening' the inherited class to the base class so this would work?

EDIT:regarding XmlInclude(typeof inheritedClass), currently this method could potentially return a number of types of inherited class (i.e myInheritedClassA and myInheritedClassB) is it case of simply having to add each of the inheritedTypes in this tag?

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VB Allows The Type Parameters To Be Used As The Base Class For The Generic Type?

Mar 30, 2010

1) VB Allows non-type template parameters2) VB supports explicit specialization 3) VB allows the type parameters to be used as the base class for the generic type4) VB allows a generic type parameter itself to to be a generic 5) VB enforces that all codes are valid for all types of parametrs

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Convert From Base Class To Inherited Class?

Jun 2, 2009

I understand that inherited classes can't be converted from base classes. But is there any way to write a conversion sub, so that the base class gets assigned to MyBase, then extra properties are added?[code]...

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Where To Find Base Type Of A Class

Jun 9, 2009

One thing that always bugged me, is that I do not see the base type in Visual Studio.I just stumbled on this, because I tried to cast a System. Windows.Forms.MenuItem to a System.Windows.Forms.Control..In eclipse the "intellisense" (or whatever it is called) shows me while exploring the members of a class for each member from which base class it is inherited.In Visual Studio I cannot see the base class, even if I use the Object browser or the help.[code]Is there a way to query the base type tree of a class at Design Time?

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BITS - Background Intelligent Transfer Service - Convert Each Class In The SharpBits.Base Folder

Apr 8, 2009

Has any one used BITs in VB.NET? If so, do you have code samples? I was looking at SharpBits but I have a VB project that I wanted to use BITS for. Is it possible to use it with my VB.NET program? (.NET 2.0) I was tempted to try to convert each class to VB.NET in the SharpBits.Base folder but figured I'd ask in case someone has headed down this route before.

In case you run across this question. What you can do is in the Sharpbits.Base folder (that you download from codeplex) there is a DLL you can reference in the Bin directory. You can add that into your references to access it. Marking Konrad as answer since he was kind enough to post.

I managed to get sharpbits working with some quick code which I pasted below for anyone who might stumble upon this question. Like I mentioned above add the DLL to your project.

Dim b As New SharpBits.Base.BitsManager
Dim mynewjob As SharpBits.Base.BitsJob = _
b.CreateJob("jobname", SharpBits.Base.JobType.Download)
mynewjob.AddFile("\servershareigfile.zip", "c:igfile.zip")
mynewjob.Resume()

You'll need to write some logic to check for the status of the job. Once it hits "Transferred" status you can then mark it as complete. This will write the file from a .bin to the file name you listed. Something that helped me was installing the Windows Support Tools (you can get it from a Windows 2003 Cd/DVD in the sup tools folder)and using Bitsadmin.exe to view the status of the job while debugging.

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Subclass Is Cast As Its Superclass Is There A Way To Use The Overloaded Properties Of The Subclass?

Sep 13, 2010

Sorry if the title isn't very clear. This is a VB.NET (2010) question I have a superclass called "Device" which has a number of subclasses that inherit it. Some of those subclasses also have subclasses. In particular, I have a class called "TwinCatIntegerDevice" which inherits "TwinCatDevice" which inherits "Device."The relevant parts of Device look like this:

[Code]...

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Overriding Properties Of A Subclass Of An Inherited Class?

Jun 7, 2012

I am trying to override a property of a subclass of an inherited base class. I've tried to simplify this code as much as possible but am not comfortable enough with my own abilities to simplify anything else without loosing the ability to understand an answer.The property propertyName in the otherClass is currently incorrect. I want to be able to override propertyName in baseClass with the propertyName in otherClass. Is this possible to accomplish?

Public Interface interfaceName
Interface iInterfacePropertyName
Enum enumName

[code].....

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.net - Can A Generic Version Of A Derived Class Override A Base Method Using The Generic Type

Apr 13, 2012

Consider:

Public MustInherit Class Column
Public ReadOnly Property ReturnSomethingUseful() As Object
Get
'return something useful

[code]....

But this gives the following error:

Public Overrides Function ParseValue(sValue As String) As Boolean'
cannot override 'Public Overridable Function ParseValue(sValue As String) As Object'
because they differ by their return types.

I accept that you can't do this, but I'd like to be able to preserve the semantics of what I'm. trying to do, which is to have an untyped version that deals with Object, but a typed version in derived classes that knows about the specific type T.

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Error - Base Class 'System.Windows.Forms.Panel' Specified For Class 'MenuButton' Cannot Be Different From The Base Class 'System.Windows.Forms.UserControl'

Mar 12, 2010

When I do this

Public Class cInherits : Inherits Panel

I get this: Base class 'System.Windows.Forms.Panel' specified for class 'MenuButton' cannot be different from the base class 'System.Windows.Forms.UserControl' of one of its other partial types.

How do I inherit?

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Form Inheritance - Error1Base Class 'MenuStrip' Specified For Class 'Lesson2' Cannot Be Different From The Base Class

Apr 15, 2010

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.

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Value Of Type 'System.Func(Of String, String)' Cannot Be Converted To 'System.Convert

Feb 17, 2011

Value of type 'System.Func(Of String, String)' cannot be converted to 'System.Converter(Of String, String)

Why? They are both effectively a function pointer (or delegate?) to a function that accept a string and return a string.

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VS 2008 Dragdrop - Check If The Present Data Type Inherits From The Base Type

Aug 20, 2009

I have a number of controls (Device1, Device2, etc.) that all inherit from BaseDeviceControl. In the DragEnter event handler I am trying to test for the correct type by using the BaseDevvceControl like this....

[Code]....

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Create A New Class That Inherits From The Base Form Class And Define A New() Method With Parameters?

Oct 1, 2008

I've been creating short test apps repeatedly to try to understand some of the concepts in VB.NET.For the most part it has been illuminating.I read Bucky's .NET knowlegebase tutorial on passing objects as parameters to newly created forms. He shows how to create a new class that inherits from the base form class and define a New() method with parameters Extending the concept I thought about doing the same thing with a form that was created at design-time (In this case Form2).

[Code]...

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Call Method Base Class In Program Passing Sub Class Objects?

Apr 22, 2012

Base class has one field to hold numeric balance value. With 2 methods that accept arguments for adding and subtracting the new input calculating new balance. Sub class has four fields dates, transaction, memo and amount.I have a deposit form, and withdraw form. Each time one transaction is entered it creates an object with sub class fields, then adds to the account collection. My problem is not understanding how to call the deposit/withdraw method and pass the current transaction amount back to the base class to alculate the new balance. Does anyone have any links to information/tutorials on how to perform something like this? As you can see with my code I have tried various different approaches without any success.

[Code]...

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.net - Suppress A Property Or Method From A Base-class In A Derived Class?

Apr 7, 2011

Supose a base class

Public Class airplane
Private var_num_seats As Integer
Private var_num_engines As Integer

[code]....

Obviously, I don't wish that the class Glider has the method "start_engines" neither the property "num_engines". Otherwise, other child classes may have. How can I supress these property and method in child class, not just ignoring (if I can)?

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.NET Class Inherits A Base Class And Implements An Interface (works In C#)?

Apr 9, 2010

I am trying to create a class in VB.NET which inherits a base abstract class and also implements an interface. The interface declares a string property called Description. The base class contains a string property called Description. The main class inherits the base class and implements the interface. The existence of the Description property in the base class fulfills the interface requirements. This works fine in C# but causes issues in VB.NET.

[Code]...

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Can't Inherit Shared Properties From A Base Class In A Child Class?

Dec 29, 2010

This is another one of my "I think it's not possible but I need confirmation" questions.I have a base class for a bunch of child classes. Right now, this base class has a few common properties the children use, like Name. The base is an abstract class (MustInherit)Technically, this means that everytime a child class is instantiated, it lugs around, in memory, its own copy of Name. The thing is, Name is going to be a fixed value for all instances of a given child. I.e., Child1.Name will return "child_object1", and Child2.Name will return "child_object2".

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Does An Inherited Class Automatically Implement An Interface From Its Base Class

Jun 10, 2011

Suppose I have piece of code like this:

Public Interface ISomething
....
End Interface

[code]....

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Casting From Base Type To Derived Type

Jun 29, 2010

I'm wrestling with this treeview control. I have extended the TreeNode class to attach some extra data to the node. Basically, I added one property:[code]Is there a way to cast from a base type to a derived type?

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Access The Base Class Inside A Derived Class?

Oct 22, 2010

How do I access the base class inside a derived class?

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Get Base Class Object Reference Outside The Class's Definition?

Dec 10, 2010

If we are within the derived class then ofcource we can use MyBase keyword to access base class's object reference . That's fine , how can we take that base class's object reference outside that derived class's definition.My following code will explain what i want . Actually that is giving error right now, but it is explaining my requirement .

Public Class Base
Public x As String
End Class

[code]....

Actually there is error in ReadOnly Property BaseReference's Getter . Error is "Error 1 'MyBase' must be followed by '.' and an identifier. " how can i get base class object reference in Main method ?

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Convert Base 100 To Base 60?

Jul 22, 2009

Specifically I have fractal hour... in base 100... that does not reflect what the true minutes/seconds left that it represents

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Base Class Collection With Sub Class Objects

Jul 19, 2010

[code]The reason that this is a problem is that this is a collection of EventBase objects, but I'm trying to populate it with child classes instead. For example, I might have a JumpEvent class that inherits EventBase, and this is being put into the EventBaseCollection. That means that value.GetType() returns the type of JumpEvent, which as you might guess does not equal the type of EventBase.The goal of course is to simply loop through all of the various events without having to know anything about the sub-classes. Is there a way to determine the type of the base class so that the OnValidate call will work? Or is this just the wrong way to go about it altogether?

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Me.Controls() Collection - Control Type Can't Be Converted To The "Timer" Type

Dec 16, 2011

I am trying to make it so when I use Me.Controls("Timer1") for example I can access specific commands for a timer such as Stop() Start(), I tried CType() and typed in "Timer" as the type but it says the control type can't be converted to the "Timer" type.

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Check If The First One Can Be Converted To The Second's One Type Or Not?

Nov 24, 2010

If i have 2 variables, how can I check if the first one can be converted to the second's one type or not?

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Convert From C# To VB But Converted Code Doesn't Work?

Jul 6, 2011

I used site to convert from C# to VB but converted code doesn't work. Can some one to convert that code to VB 2008.

private void TreeViewItem_Selected(object sender, RoutedEventArgs e)
{
ExpandToItem(sender as TreeViewItem);
}
void ExpandToItem(TreeViewItem i)

[Code]...

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