Implement An Interface In .Net When Two Methods Have The Same Name But Different Parameters?
Mar 3, 2010
I am a C# programmer but I have to work with some VB.Net code and I came across a situation where I have two methods on an interface with the same name but different method parameters. When I attempt to implement this interface in a class, VB.Net requires explicitly declaring "Implements MethodName" after the method signature. Since both method names are identical, this is confusing the compiler. Is there a way to get around this sort of problem? I suspect this must be a common occurrence. Any thoughts?
N.B. This was more a case of the programmer not verifying that the interface in question had not changed from underneath him.
View 3 Replies
ADVERTISEMENT
Mar 21, 2012
I'm fairly new to VB programming. I have a control which is mounted within a form. I need to implement a callback, so that the control can make the parent form do something. My plan was to create a MustInherit class with MustOverride methods, and make the form inherit the MustInherit class. However, Visual Basic tells me that the form cannot inherit more than one class, which means that it can either inherit my MustInherit class, or System.Windows.Forms.Form, but not both.[code]...
View 1 Replies
Jan 13, 2012
I have the following
Private Structure FadeLabel
Dim Alpha As Byte
Dim Color As Color
[CODE]...
Which I picked up from this thread: [URL]
What I'd like to do is 'implement' the BringToFront method so that when I use the 'FadeLabel' structure I can also call it's method 'BringToFront'.
View 1 Replies
Aug 11, 2009
Is it really impossible to create an extension method in C# where the instance is passed as a reference?
Heres a sample VB.NET console app:
Imports System.Runtime.CompilerServices
Module Module1
[code].....
View 3 Replies
Oct 21, 2009
I have a List(Of AddlInfo) with AddlInfo being an object. I'm trying to pass addlInfoList by reference into a function of another class:
[Code]...
This works if I'm not passing the reference into another class, but when I try to do this, I get the following error: Overload resolution failed because no accessible 'Sort' can be called with these arguments:
[Code]...
View 1 Replies
Jun 25, 2012
I'm trying to implement a Web API project that exposes some models. However, the way the model is retrieved isn't very RESTful. 1.Instead of having just one ID, it has a combination of 4 different ones to populate the model data by running a stored proc on the server.Dim balance as New BalanceSheet(uid, mid, eid, fid)The snippet above will use uid, mid, eid, fid to retrieve the correct record from the database.
View 1 Replies
Aug 7, 2009
I am trying to implement an interface defined in IDL, in a vb.net class here is the idl
interface IEmissaryRoot : IDispatch {
id(0x68030000), propget]
out, retval] IActivityCol** );
[code]....
View 3 Replies
Jul 25, 2010
I'm trying to assign a datasource to a ComboBox control during runtime. When I do so, I get the attached message. [Code] I want to learn how to use an Interface. The error message is suggesting using an IList. How would I do this.
View 2 Replies
Nov 24, 2006
I have a situation where I am defining an interface and then using that directly eg:Dim x as IWhatever = new implementationOfIWhatever()Which is fine, butmplementationOfIWhatever also implements IDispoable so I want to be able to do x.Dispose or ideally Using x but get the error that that this is not declared or must implement IDispoable as IWhatever of course doesn't define Dispose or implement IDispoable
View 5 Replies
Nov 18, 2009
I am trying to implement an interface on an ASP.NET 3.5 web page that will let the user specify up to three conditions for insertion into a Linq to SQL query. It looks something like this:
[Code].....
how to assemble my query from the values in the various DDLs and TestBoxes.
View 2 Replies
Jul 16, 2009
I have an interface program written in VB .Net (VS2008xxx.dll). Is it possible to implement the Interface in a VB6 program (VB6xxx.exe)?
View 8 Replies
Dec 23, 2009
Say I want to know more about a class mshtml.htmlinputelement for example.Say I want to know. What is his parent classes? What interface the class implement? How do I do so through object browser?
View 1 Replies
Sep 26, 2011
I have a small application that consists of multiple forms that each need to have the ability to be updated (not repainted, the data/components values redefined) when called to. So for instance, if I had a form that contained a count of some sort and another form modified that count I would need to update the form that displays the current count. With that being said it needs to implement an interface with these methods (see below). My issue comes when I want to add events to these methods so if I call the UpdateData event it would trigger the OnDataUpdate method, but because of the syntax of implementing methods and handling events you cannot do so.
[Code]....
View 5 Replies
Jun 7, 2011
is it possible to implement strategy pattern with different parameters in VB.net? For example I have the following code:
Public Interface InterfaceDataManipulation
Sub updateMyData()
End Interface
How to implemente updateMyData in the class that implements above interface class with different parameter,for example in class x :
Public Class X
Implements InterfaceDataManipulation
Public Sub updateMyData(ByVal x as String)[code]......
But the IDE raises an error "class x must implement updateMyData on interface InterfaceDataManipulation"
View 2 Replies
Jul 13, 2010
I defined the following interface:
Interface INewFileDetector
...
roperty PollIntervalMsec As Integer
[code].....
View 2 Replies
Sep 21, 2011
I need to implement an event interface defined in a COM app so I can get events. I want to use System.Runtime.InteropServices.ComTypes.IConnectionPointContainer. In Adam Nathan's ".NET and COM", Adam shows some C# code that connects to an IE event set. There he does this:
[Code]...
View 10 Replies
Jul 30, 2009
Do i have to implement the serial port in the interface again if i have put it in the behind code? Do have any links that can make me understand.
View 8 Replies
Jul 19, 2010
i may be misunderstanding this but on MSDN i believe it says that it is good practice to implement the Dispose destructor in every class you write. should i (do you) really implement the IDisposable interface with every class i write? also, is the proper syntax for implementing an interface to put the "Implements" keyword on the line after the "class" declaration? i put it on the same line as "class" and I got an error.when coding the method implemented by the interface, is it mandatory to follow this syntax, as an example: Public Sub Dispose() Implements System. IDisposable. Dispose.
View 3 Replies
Nov 15, 2010
So I implemented my own form of Enum static classes so I can associate strings to enumeration values. One of the shared functions in each enum class, GetValue, is used to quickly look up the string value from an internal array via the offset. While all of the enum classes implement the same exact function, the data types of their parameters differ, specific to the enums in each class.
So I come to a point where I want to create a generic class that can use any of the enums by passing it as a generic type parameter. But I cannot find a way to constrain type T in such a way to be able to call each enum's GetValue function. This is where an interface would come in handy, but VB.NET forbids interfaces for shared methods.
I have a base class that I could constrain to, but the base class doesn't implement the GetValue method, and I can't define a generic version of it, because I need to rely on shared properties of each child class in order for GetValue to do its thing.[code]..
View 2 Replies
Jan 19, 2011
All my data objects implement an interface IFillable
Public Interface IFillable
Sub Fill(ByVal Datareader As Data.IDataReader)
End Interface
In the objects themselves you will typically see something like
Public Class Supplier
Implements IFillable
[Code]...
Now here is the tricky bit. Given that all my property names WILL ALWAYS match my database column names what I want to do is using reflection generate the fill method at compile time and infer the types and column names for the datareader.I am assuming I will need to structure this functionality as some sort of a tool/vs plugin? What I am looking for is guidance on the best way to go about this.
PS: BTW: Obviously I could easily do this using reflection at runtime but I dont want to take the performance hit for it (Although theoretically if I could cache the values somehow (static class?) it might not be too bad).
View 3 Replies
Nov 30, 2010
How do I limit an Interface when defining it? What is the correct technical term for what I am describing?For example, I want MyInterface to only be implemented for objects that implement IList(Of T) and ICollection(Of T).
View 5 Replies
Apr 12, 2011
Why can't a sub implement an interface and handle event at the same time? The following gives my a syntax error:[code]I know I could handle this kind of logic with another method, but that is not the point. I just want to understand the reasoning behind this.
View 2 Replies
Apr 21, 2009
We have a web service solution in VB .Net 2005 that we have started getting an error in. We provide an interface like the following:
Public Interface IBatchTrackerService
Function InsertBatchTracker(ByVal BatchTrackerObject As BatchTracker, ByRef errorNum As Integer, ByRef errorMsg As String) As Integer
End Interface
In our class we implement this interface with the following code.
Public Class BatchTrackerService
Implements IBatchTrackerService
[code]....
This code was working properly but has now started causing errors. The error we receive is:
Class 'BatchTrackerService' must implement 'Function InsertBatchTracker(BatchTrackerObject As BusinessObjects.BatchTracker, ByRef errorNum As Integer, ByRef errorMsg As String) As Integer' for interface 'IBatchTrackerService'.
The odd thing is that the project compiles correctly, but shows many of these errors after the compile is finished.We recently installed Panda as our virus protection which caused a different error that I found the solution here for.
Updated 4/21/2009 at 11:50 Both the interface and the implementation are within the same project in the solution.
Updated 4/22/2009 at 08:16 I tried removing the BusinessObjects identifier from in front of the BatchTracker type but I still get the same thing. This is just one example of what has happened throughout the entire solution. Every implementation in this BatchTrackerService is flagged as an error, plus there are several other services that have almost every implementation flagged as an error as well. But somehow the project builds successfully, and yes, it runs properly!As for BusinessObjects, it contains many of the classes we use as parameters and it is simply another project within this solution. We do not reference any external assemblies to provide these classes to BusinessObjects.
Updated 4/22/2009 at 08:24 The last thing I noticed was that any function/procedure that doesn't use a 'BusinessObjects' class as a parameter, but simply uses strings, integers, etc is not flagged as an error.
Updated 4/22/2009 at 09:50 I tried reverting back to a previous version and I was able to compile and the error count stayed at zero. I narrowed it down to a check-in of one of the project files where the reference to BusinessObjects was slightly changed. I reverted just this project file and everything compiles fine now.
View 2 Replies
Apr 21, 2009
Recently I needed to compare a suggested pattern for IDisposable and object finalization with the auto-generated one we which VS2005/VB.NET provide. We have used the auto-generated one a fair bit, but after looking it the two side by side I had a number of questions about the VB.NET implementation..
[Code]...
Overall I am confused by the supposed added value of having an extended code-path that executes when Dispose() is called explicitly(as opposed to having a common path that is executed regardless of whether or not Dispose() was called explicitly). how it does anything other than delay the actual release of managed resources if Dispose() isn't called directly. In essence it seems to only work to make the managed resources unreachable in the object graph, orphaning them until the 2nd GC run rather than freeing them at a point where they are known to be no longer needed.
View 3 Replies
Aug 28, 2010
I am new to .Net Programming and would like to know if Reflection is suitable for traversing an Object to discover Collections within an instance of a class. I am working with the Microsoft.SqlServer.Management.Smo Namespace.
The plan is to connect to a database, determine what collections exists, then for each of those collections, if the Collection exposes objects which implement the IScriptable Interface, generate a script for the object.How do i do the following (This is pseudo-code as I am seeking assistance with using reflection or some other method to do the following)
[Code]...
I would like to enumerate all objects in db with one function if possible
View 2 Replies
Nov 22, 2010
I created an interface - TermsService.vb and defined the following method : Function GetTermsList() As List (Of Terms)
how do I modify my TermsDB class to implement the TermsService interface I've just created? Here is my code: Have I implemented it correctly?
Imports System.Data.SqlClient
Friend Class TermsDB
Implements TermsService
[Code].....
View 1 Replies
May 2, 2012
I'm having trouble porting some .NET2-era C# to .NET2-era VB.NET. Specifically, I am trying to define an interface that an ASP.NET user control will implement.(For background, I am trying to re-implement Phil Haack's Model-View-Presenter example from several years ago: http://haacked.com/archive/2006/08/09/ASP.NETSupervisingControllerModelViewPresenterFromSchematicToUnitTestsToCode.aspx)
The C# interface I'm working from defines properties and events (IsPostBack, Load) that are already implemented by the base control.However, VB.NET is forcing me to explicitly implement these properties/events in the user control (Public Property IsPostBack() As Boolean Implements IView.IsPostBack...). I'd like to just define these in the interface and not have to do anything special in the code-behind of the implementing user control.I'm assuming that I can do this in VB.NET, I just don't know how. I've spent all sorts of time googling/bing-ing, and haven't come up with the answer.
View 1 Replies
Mar 1, 2010
I need to create unit testing project for my current website. The currentw ebsite si written in VB. All unit testing examples are using interface to create mock object. My current VB class does not implment any interface. Can I add interface and implement it to my current class and functions without affecting or changing codes to any pages in my website that call the functions? For examples my current class is like:
[Code]...
View 2 Replies
Jun 10, 2011
Suppose I have piece of code like this:
Public Interface ISomething
....
End Interface
[code]....
View 2 Replies
Jun 18, 2009
class inherit from another class and implement an interface?
View 4 Replies
