I have a module with code that refers to controls on form1 form1.textbox1.text 'after adding the sub new overload below to my form my module gives me "reference to a non shared member requires an object reference" why is that? [code]
View 9 Repliespassing a variable to another formI have a module with code that refers to controls on form1form1.textbox1.text 'after adding the sub new overload below to my form my module gives me "reference to a non shared member requires an object reference"
View 2 RepliesI have a problem with the VB.NET compiler failing to compile a class (in a separate C# assembly) which contains two overloads of a method with generic arguments. The equivalent code in C# compiles against the same assembly with no errors. Here are the two method signatures:
protected void SetValue<T>(T newValue, ref T oldValue)
protected void SetValue<T>(T? newValue, ref T? oldValue) where T : struct
Here is the code to three assemblies that demonstrate the problem. The first is the C# assembly with a Base class that implements the generic methods. The second is a C# class derived from Base and calls both overloads of SetValue correctly. The third is a VB class also derived from Base, but fails to compile with the following error message:
[Code]...
Am I doing something wrong in the VB code, or are C# & VB different when it comes to generic overload resolution? If I make the method arguments in Base non-generic then everything compiles correctly, but then I have to implement SetValue for every type that I wish to support.
What scenarios would you consider operator overloading in .net?
View 5 RepliesI have a base class with the the following enum and property:
[Code]...
First off, how do I do this - is it by simply overloading it? And secondly will my original property pick up the new enum automatically when using the derived class or will I need to overload that too?
maybe it's not a method exactly. here's what I'd like to do:
Private _Columns As ArrayList
Public Property Columns() As ArrayList
Get[code]....
which would allow me to conveniently set the property by assigning to it various kinds of collection types... except, I can't do it because apparently the Set method has to take an argument of the type of the property itself... I get the complaint:
'Set' parameter must have the same type as the containing property
is there a way to do this?
i would like to hijack the assignment operator and do some customization before an instance of my class is assigned.
example:
Dim A as New MyClass
Dim B as MyClass = A
i want custom the behavior of = is that possible?
I wanna overload the ShowDilog for my form. I wanted to clarify whether the Owner should be passed as Value or Reference.
View 2 RepliesI am having a problem convincing Visual Studio and the compiler to use the correct method overload, possibly because of inheritance.
Given these objects:
Public Class Matrix
...
End Class
[code]....
I have a weird situation. I have a C++ code that overloads the +,-,* operators and exports them in a .DLL file. Now, I want to import those overloaded operators from within VB.NET code. So it should be like this:
<DllImport("StructDLL.dll")> Public Shared Function
Operator +(ByVal a1 As A, ByVal a2 As A) As A
End Function
So what I'm trying to do above it just import the lovely overloaded operator + from the DLL.Note that the operator is already overloaded from inside the DLL, so should I import it as a Function or as an Operator like this?
<DllImport("StructDLL.dll")> Public Shared
Operator +(ByVal a1 As A, ByVal a2 As A) As A
End Operator
The overloaded plus operator is supposed to add structs. So the DLL is programmed to work on structs (C++) and I want to import it in VB.NET to work on Structures.
I need type parameter overloading as such:[code..]
so that i can New Map(Of Human) and the compiler will automatically match it to Public Class Map(Of TKey, TValue) and if i new Map(Of String) the compiler will automatically match it to Public Class Map(Of TKey As IEquatable(Of TKey), TValue) (since String is an IEquatable(Of String))
Right now my solution is to give the class different names as such:[code...]
I'm working together with someone on a project, but I'm writing code in VB.Net, and hes coding in VC++. I'm trying to get some kind of compatability going on, so I'm putting my support classes into a VB dll. I've tested it a little, and it seems that all of the functions work, but the operator overloading that I did in VB doesnt seem to carry over to C++.
View 2 RepliesI'm trying to overload several functions. These are first defined in an interface:
Code:
Namespace Scripting
Public Interface IGlobalFunctions
Overloads Function InOutBox(ByVal messageBoxText As String) As DialogResult
Overloads Function InOutBox(ByVal messageBoxText As String, ByVal caption As String) As DialogResult
[Code] .....
It complies and runs.. But I can only use the first version of InOutBox when I try to use the next one I get an error telling me: "Wrong number of arguments or invalid property assignment".
i recently discovered a nice feature called overloading, now the question is can i also do that for outputs? for example i want to call a function that would automatically return the datatype i assign the function toright now im geting an error saying "blabla and blabla cant overload eachother because they only differ by return types
View 3 RepliesI have a class that implements an interface. Other objects will get an instance via a method like:
Dim AU1 as IAUC = GetAU(<some GUID>)
Dim AU2 as IAUC = GetAU(<some other GUID>)
What I would like to be able to do is this:If AU1 = AU2..The parts of the class that make up the interface could be equal when the rest of the class is not, and the equality of the interface objects (if you can call them that) is complicated. Several fields have to be compared in odd ways.One option I have is to just add an Equality method to the interface, which would work, but I would rather overload the = and <> operators. As far as I can see, you cannot overload operators as part of an interface, but I was hoping that I had overlooked something.
This is a general question about Object Orientation and specifically overloading functions in .NET (or any other framework or language). I am looking at an application that has a lot of duplicate code. For example, have a look at the following functions: [code] I would of thought that best pratice would be to put: //code that is specifically relevant to Test1 variable in a separate function as it is common in both functions.
View 2 RepliesFor good reasons I would like to have something like truckA = truckB + truckC where only the loads of the trucks are added, not the license plate numbers. Also I don't really want to return a new object (lots of overhead), just change one or two of the properties. Only thing I can come up with is truckA.Load = truckB.Load + truckC.Load, or at best truckA.Load = truckB + truckC which still doesn't look elegant, and - worse - still requires the creation of a new Load object.(this is just a way of stating my problem; the real objects are quite big and complicated) Currently I have a Sub isSumOf so the code reads TruckA.isSumOf(truckB, TruckC)
View 4 RepliesCan someone on the VB language team explain why a function result type is not part of the parameter signature?If it were then function overloads would also work for functions that only differ by the result type. In some cases, this is useful (aka cleaner code) especially when you have strongly typed data.
Other languages have this and implement it by considering the function result as an OUT parameter either as param 0 or at the end of the param list (stack) so existing type matching verification can be performed by the compiler.
In VB, the workaround is just messy and would be easily fixed by a language change. This example is overly simplified and not meant as a solid justification for the request Say you have a parse requiirement that takes a comma delimited string in the form: "31,32,33,34" or "bob,carol,ted,alice"
In you code,
[Code]...
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.
I have a project that reference from leadtools 16.5, and after that, i want to run my project..i see am error like it " An error occurred creating the form. See Exception.InnerException for details. The error is: Attempted to read or write protected memory. This is often an indication that other memory is corrupt. im using vb 2008 pro
View 6 RepliesI'm using Visual Studio Development Server (Visual Basic 2010) and it works fine. Now I've enabled NTLM Authorization because I want to test the website using a different user account. Now when I try to access the website I always get the following error page:
Server Error in '/' Application.
HTTP Error 403 - Forbidden.
Version Information: ASP.NET Development Server 10.0.0.0 .I'm using a test account which is a normal user within our domain. I've already set the access rights in my project folder to Full Access for this user but it does not help.
When I deployed my project on a server, in certain circumstances, I get an error page that indicates I should create a custom error page. I was wondering how exactly I would implement this custom error page the server asks for to give me a precise and helpful message or preferably, how I would get the error to just display on the main page?This is the error message I got below
Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine.
Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off".
<!-- Web.Config Configuration File -->
<configuration>
<system.web>
[code]....
Notes: The current error page you are seeing can be replaced by a custom error page by modifying the "defaultRedirect" attribute of the application's <customErrors> configuration tag to point to a custom error page URL.
<!-- Web.Config Configuration File -->
<configuration>
<system.web>
[code]....
I try to compile a project with msbuild.exe I have this error :
vbc : error BC30136: Error creating Win32 resources: Error reading icon '"Recycle Bin Empty.ico"' -- The filename, directory name, or volume label syntax is incorrect.
This icon is the Application icon which is in the same directory of the project.vbc is started with /win32icon:"Recycle Bin Empty.ico" parameter.Don't know why MSBuild can't reach the file.
I'm getting these errors:
AnonymousPathAnonymized.vb : error BC30037: Character is not valid.
AnonymousPathAnonymized.vb(2) : error BC30627: 'Option' statements must precede any declarations or 'Imports' statements.
[code].....
This error first appear to occur randomly. Steps to recreate:Open Visual Studio and load a solution (some files automatically opened) - this is when the problem occurs Close all open files Restart visual studio and load solution (no issues)Open Exactly the same files again, restart visual studio and load solution so files open automatically (problem occurs!)
However, when trying to narrow it down to a single file (that is automatically opened when the solution is loaded), I couldn't reproduce the problem. Now with all the files open again the problem doesn't occur!!! So it looks like it is fixed - though this happened before and eventually the issue came back.
I think it is to do with one of the user controls with DevExpress controls on it - when the error occurs, the designer displays the error. Though I can't reproduce it at the moment to confirm that.
I got a serious problem. Though I have made my program newly it shows error. I have used 1280,1024 animation only for first form then used 1280,1024 image for every form. Today I was checking then it was showing me error message for 19th & 20th form. If I use On Error Resume Next then it shows error for another form ; if I use same code there in the menu item I mean so that I can get rid of error when I click to show a form it shows another error. First error message is "InvalidOperationException was unhandeled An error occurred creating the form. See Exception.InnerException for details. The error is parameter is not valid." and second error is "OutofMemoryException was unhandled Exception of type 'System.OutOfMemoryException' was thrown". I have noticed it that it doesnt show error message for those form which have few labels and text boxes. It shows error message for those forms which have 1 menu bar, 2 picture boxes(one is 1280,1024 & another is 250,456), 2 group boxes, 40 labels, 3 combo boxes, 38 text boxes & three buttons. Please help me I need to get rid of this problem. Does it mean that I cant use unlimited control there in my form?
View 2 RepliesI have the following Stored Procedures create or replace PROCEDURE WEB_AC
[Code]...
First one: At some point in the application I have the valor parameter (of the visual Basic Function) as a string with spaces that is something like "some string with spaces". When this happens, the stored procedure don't update the table. If I execute the SP directly in the DB (with SQL Developer) all works fine. I know it has something to do with the string missing some quotes(') but I haven't make it work yet. Some ideas on this?
Second problem: Sometimes, when debuging the application, if I interrupt the execution, I start getting the ORA-24338 'statement handle not executed' error for hours every time I try to execute it again. I believe it has something to do with an open transaction. But honestly, as I'm new in working with Oracle, I really have no idea what the problem could be.
[Code]...
I get this error when I try to publish: Error 2 An error occurred while signing: Failed to sign binReleaseapp.publish\setup.exe. SignTool Error: ISignedCode::Sign returned error: 0x80880253
The signer's certificate is not valid for signing.
SignTool Error: An error occurred while attempting to sign: binReleaseapp.publish\setup.exe MITS 2008
I downloaded the .net 3.5 sp1 and it performed a repair but it still will not publish.
I'm trying to update data to a Access data base using the following [code]...
View 3 RepliesI used error provider tool to display the error when the textbox is empty. when the error message is displayed immediately it is inserting the record into the database.I want to clear the error and then insert. how to take the control to textbox?
[Code]...