Overloads Vs Generic Arguments

Aug 24, 2009

I have a question. In the framework, that was largely written before the generics came, you often see a function with lots of overloads to do something with different types. [code] and then have some kind of ifs/switch statements with typeof() to try to infer what the types are and what to do with them.What is best practise? Or what are the ideias that'd help me choose between a) and b)?

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Are Generic Operator Overloads Allowed In .NET 4

Dec 15, 2010

I am assuming "No", but I cannot find conclusive proof on Google to back this assumption. Using keywords of 'vb.net "generic operator overload"' yields exactly 1 result, and removing 'overload' gives more, but no direct statement to the issue.

My thinking is given an abstract class, it'd be great to be able to implement a generic operator overload that a derived class can use in such a case when said operator overload has to return a New copy of the derived class, yet the code for each overload is the same. If that makes any sense.

This touches back to my previous questions on my custom Enum class and overloading the bitwise operators (And, Or, Not, & Xor), but, this particular thought was prompted by a mere curiosity of "Can it be done?".

Here's what one of my custom enums basically look like:
The parent, EBase is nothing special, just hosting common Name and Value properties, plus two shared operators, op_Equality and op_Inequality.

Friend NotInheritable Class EExample
Inherits EBase
Private Sub New()

[Code]....

Then (in theory anyways), calling EExample.OneA Or EExample.FiveE would work because the compiler would know to call the generic operator overload from EBase, know that EExample.Enums matches the IEnums interface constraint, and automatically supply T.

That or I'm just swimming up a certain creek here without a paddle and over-analyzing things. But it's an interesting thought, no? What is StackOverflow's consensus? Do I need to lay off the Spice a little bit?

PS: I use /* */ style comments because Markdown doesn't handle VB-style properly.

PPS: I know that, in the last example, Return New T( ... ) is invalid, but I can't think of a proper syntax that would articulate the basic idea.

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VS 2008 : Error : Too Many Arguments To 'Public Overridable Overloads Function Queryname() As Integer'

Jun 2, 2009

i'm accessing an access database and want to execute the following query

INSERT INTO sometable
(date, field1, field2)
SELECT ( ? AS Expr1, field1, field2)
FROM othertable

? is a date i generate in code and field1,field2 belong to othertable i put it in a tableadapter and execute it by me.tableadapter.queryname(calculated date) but i get the error : Too many arguments to 'Public Overridable Overloads Function queryname() As Integer' Also if i try to generate the date in the query builder in the form dateserial(year(now),month(now),1-1)the query builder does not accept it?

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VS 2008 Too Many Arguments To 'Public Overridable Overloads Function Fill(dataTable As TetrisDataSet.tblTransactionDataTable) As Integer

May 14, 2009

I'm following this tutorial: [URL]..except I'm connecting to my own data source - a MS Access database.This is the query I have setup with the dataset:

SELECT Terminal_ID, SUM(Transaction_Quantity) AS Total
FROM tblTransaction
WHERE TransactionType_ID=3 and Transaction_DateTime>[@fromdate]
GROUP BY Terminal_ID

The debug fails immediately because it needs the extra parameter so I change the code from:

Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'TODO: This line of code loads data into the 'tetrisDataSet.tblTransaction' table. You can move, or remove it, as needed.
Me.tblTransactionTableAdapter.Fill(Me.tetrisDataSet.tblTransaction)

[code].....

The error I get on build is:Too many arguments to 'Public Overridable Overloads Function Fill(dataTable As tetrisDataSet.tblTransactionDataTable) As Integer

...I gave it the extra parameter, so what gives? Something special I need to do as it's a datetime field?

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Generic Was Used With Wrong Number Of Arguments Error?

Feb 12, 2010

Does anyone know what on earth this is? i can't get it to go away.model {"The generic type 'System.Web.Mvc.ViewUserControl`1' was used with the wrong number of generic arguments in assembly 'System.Web.Mvc...it happens when i call a newly constructed model that i pass to a partial view, and try using/calling some methods of it in the view.

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Error - Red "List" Says Too Few Type Arguments To System.Collections.Generic.List(Of T)'

Mar 12, 2009

I have converted c# .cs to vb:= I have 6 errors on:

Red "List" says Too few type arguments to system.Collections.Generic.List(Of T)'
Orange "Calendar" says Value of type 'System.Windows.Forms.Control.ControlCollection' cannot be converted to 'Form1.Kobush.Windows.Forms.Appointment'.

[code]....

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Is There A Concept Of "Generic Structure" Similar To Generic Collections, Generic Classes

Dec 16, 2009

We have migrated our Vb6 application to VB.NET using a third party tool. Now we are in a process of Refactoring and introducing object oriented concepts in the application.

In VB6, we were using structures in many places. As a part of introducing object oriented programming,

1. is it a good idea of changing all Structures to Classes? or Is there a concept of "Generic Structure" similar to Generic collections, Generic classes?

2. Can some one guide me any source containing guide lines or best practices for applications that are migrated to VB.NET from VB6 and implementing object oriented programmaing.

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Is 'Overloads' Keyword Ever Required

Oct 27, 2010

From what I can see online the Overloads keyword is optional but is there ever a time when it is necessary? It even seems to be an error when used in a Module.

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Overloads Versus Overrides In .net?

Oct 24, 2011

What are the behaviors difference for the Previous Property of Other1 and Other2 Class.Note than the return type of the ovrloaded Previous Property of Other2 as bean changed to Other2 while it stay as Base for Other1.

Public Class Base
Private _Previous as Base
Protected Overridable ReadOnly Property Previous As Base

[code]....

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Sql - Server Connection Overloads

Feb 26, 2012

I'm trying to run this code, but it displays the error "overload resolution failed".

[code...]

Here is the full error:[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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.net - Main Method Have The Word 'Overloads' In VB?

Aug 13, 2011

Coming from C#..I was looking at this website [URL]..And noticed that it said

public static void Main(string[] args) {is equivalent to Overloads Shared Sub Main(ByVal args() As String)

what is that "Overloads" all about?

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Difference Between Overloads, Overridable And Overrides

Oct 28, 2009

Difference between overloads, overridable and overrides .

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.net - Determining A Generic Type At Runtime In Non-Generic Class

Aug 14, 2010

I have a Journal that records entries for different types: Journal(Of ParentT)

[Code]....

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Construct A Generic Interface Class With Generic Functions

Nov 25, 2011

I am trying to construct a generic interface class with generic functions. My goal was to use this to implement multiple worker classes for database interaction that have the same basic functionality. Each class will deal with different object for example, category, product or supplier but unless the the functions in the interface are generic that this won't work.This is the interface code that I have but I don't know if I have done it correctly. [code]

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Difference Between Using The Overloads Keyword And Just Having Different Method Signatures?

Jul 23, 2009

Do you really need this keyword to overload methods? What is the difference between using the overloads keyword vs. just having different method signatures?

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Optional Parameters Versus Method Overloads?

Oct 6, 2009

I was familiar with the optional parameters in vb 6 and it made sense given the capabilities of the language but why the heck does VB.Net support optional parameters when there is method overloading? Which one should I use and is there a difference? If there is a difference when should I use each one?

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Overloading Functions - Overloads In The Abstract Class Implementation ?

Oct 7, 2011

I have recently come across some code that has the following. First there is a Interface with the following function Function Validate() As Boolean. That interface is then implemented in the an 'ABSTRACT' class like this.
Public MustOverride Overloads Function Validate() As Boolean Implements IBusinessEntity.Validate

Question 1: Why use Overloads in the Abstract class implementation.

Question 2: The Abstract class is then inherited into a class (TestClass). In TestClass the Validate function is implemented as follows Public Overloads Overrides Function Validate() As Boolean. I understand the Overrides keyword is to insure that this is the version of the Validate that you want called and not the Abstract class version but why again use the keyword Overloads?

From what I understand you can overload a constructor of a class by simply changing the constructor signature. Also, you overload Methods and Properties of a class by using the Keyword Overloads. But why do it when your implementing an Interface method, or an Abstract Class method that's inherited.

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.net - Creating A Generic List Of A Generic Type

Jun 30, 2011

I am trying to create a list of a generic type in vb.net 2.0 framework.
This is the generic type definition:

Public Class GenericParamMap(Of T)
Public Sub New(ByVal pParamName As String, ByVal pPropValue As T)
mParamName = pParamName

[Code]....

The compiler does not allow a "T" in the method's parameter because it's not defined, but I'm not sure how or where to define it. I thought it was okay to have a generic method definition.

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Generic Cannot Instantiate Instance Of The Generic Type With New?

Feb 8, 2012

I am trying to write a generic method, to avoid code duplication, which will create or activate a Form as an MDI children, based on its type. But I have to lines in error (see comments).

[Code]...

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Addline Function - Public Overloads Sub AddTextLeft(ByVal Text As String

Dec 13, 2010

I've got question. I created this;

Public Overloads Sub AddTextLeft(ByVal Text As String, ByVal Fontsize As Decimal, ByVal Bold As Boolean)<br/>
'-- PBA / 22.08.2006<br/>

[CODE]...

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VS 2008 Accessing Something With A Generic Generic?

Jun 19, 2012

If i have an object that implements an interface (and don't know the exact object) i can call a sub (DoSomething) by going:

vb
Dim iObj = trycast(something, iInterface)
if iObj isnot nothing then
iObj.DoSomething()
end if

How can I do this for a Generic? such as...

vb
Public Class TestClass(of T)
Public sub DoSomething()
....
end class

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Multithreading - Modify A Generic Invoke Method To A Generic BeginInvoke Method?

Oct 7, 2010

I have been using a pretty slick generic invoke method for UI updating from background threads. I forget where I copied it from (converted it to VB.NET from C#), but here it is: Public Sub InvokeControl(Of T As Control)(ByVal Control As t, ByVal Action As Action(Of t))

[Code]....

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Overload Operator In Generic Class With Generic Interface Of Super Class And Inherit Class?

Jan 21, 2010

I can do this without problem.

Class A
End Class
Class B : Inherit A
End Class
Dim Obj1 As A = New B

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Why Do 'string()' Overloads For String.Split Not Work As Documented In MSDN

Jul 29, 2010

After having some trouble in my own code using String.Split and the Split(String(), Int32, StringSplitOptions) overload, I decided to look to the MSDN.I copied the entire VB.NET code example from this link: url...I placed it in a new class, and received the following errors (same errors as my own code example):[code]Why can my code not recogognize the string() parameter overloads to String.Split? Remember, i took the code from the MSDN link above, copied and pasted and it still did not work.I am counting on using the string() instead of char() overloads shown here: url...

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Provide Cast Methods For Cast Operator Overloads In C#?

Jun 3, 2009

I read somewhere that older VB .net (pre VB .NET 2005?) couldn't use overloaded operators in a C# class. Is it true for overloaded cast operators?Either way do you guys think it's a disadvantage for a C# class library not to include them and arithmetic methods as actual methods for other languages, like:

ToDouble
ToFloat
FromDouble
Add

[code]....

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Redeclaring Something In An Inherited Class Is The Recommended-preferred Way To Use "SHADOWS" Or "OVERLOADS"?

Aug 7, 2011

PASTE ALL of this to your Form1 code window please and add one Button to Form1.

Now I am asking developers here who actually do software development for a living

especially those persons holding MCPD or similar Microsoft Certification please.

1) When redeclaring a method as in AnotherClass below which Inherits from ExampleClass,

is the recommnded way to use SHADOWS or OVERLOADS please? 2) What about when you do the same with a PROPERTY please?

Option Strict On
Option Explicit On
Option Infer Off
Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

[Code]...

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Launch An Exe With Arguments

Mar 7, 2009

I am trying to build a web page that call an exe with some arguments. It's working perfectly when i launch it on the ASP.NET development server but it's not working well when I deploy it under IIS. He is the VB code source.The log text file is created in both cases but the exe is just launched from Visual Web developer 2008.[code]

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Routines With The Same Name But Different Arguments

Oct 15, 2010

I am listing the following three subrointines....

Private Sub OutPut(ByVal Offset As Long, ByRef path As String) 'Orig
If Not cbFiles.Checked Then
item1 = New ListViewItem(Offset)

[Code]....

They have the same name but a) different types of aguments or different numbers of arguments. This is legal in VB.

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Run Some DOS Commands With Arguments?

Mar 7, 2012

Visual Studio 2010
Windows 7 X64

I'm making a multipurpose tool. In with I need to run some DOS commands with arguments.So, Ex. of what I have now.

Private filepath As String = "C:UsersTTGToolToolG5.5.0pluginscom.zend.guard.core.resources.win32.x86_5.5.0
esources"
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click[code]....

So it should be "like I like cats" or what ever it is in the textboxes in the command prompt.

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