I was wondering if it is possible to have dependent types in VB.Net 4, or alternatively, if it is possible to construct inherited objects based on the base class' constructor's parameter(s). For example,
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Is this possible in object-oriented design? I'd like to specify that in an inheritance tree, the type of a property in the child classes is different from the type of that property in the parent class. But the types are polymorphic because they derive from the type used in the parent class. e.g.:
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I have a class with a Property called 'Value' which is of type Object.Value can be of any type, a structure, a class, an array, IList etc.My problem is with the setter and determining whether the value has changed or not.This is simple enough for value types, but reference types and lists present a problem.For a class, would you assume that the Equals method has been implemented correctly, or just assume that the value has changed every time the setter is called?If I did assume it's changed, then perhaps I should assume it for value types as well, so that the behaviour is consistent.
View 2 RepliesI have a spreadsheet that has two columns (A and B) - Column A contains Month/Year and column B contains sales. I would like a bit of vba that will look in column A to find the month/year then calculate from column B the average sales for that period. So for example:
Date Sales
Jan 11 500.00
Jan 11 250.00
Mar 11 152.00
Apr 11 116.00
So in other words there can be a number of lines with the same date/year and the code will need to identify these and average all sales from column B associated with that particular date. I would like the output to appear in a summary table showing the total average sales for each particular month - perhaps this could be output to a new sheet?
what is independent and dependent if conditions!?
View 1 RepliesI have developed an application in VB.net which uses R Programming language. The library that help connect VB.net to R is called R-DCOM. The application requires the user to install R-Programming language into the user's computer. The application was working all fine until there was a version change in the R-Programming language. The specific libraries involved with this are: Interop.STATCONNECTORCLNTLib.dll, Interop.StatConnectorCommonLib.dll and Interop.STATCONNECTORSRVLib.dll. It also uses StatConnectorClnt.tlb, StatConnectorSrv.exe and StatConnLib.tlb to run the application. Is this something related to "DLL hell". Is there a fix to that I may not have to recompile and install the original code and install them to the user's computer all over again.
View 2 RepliesThere are several times in my code when I need to determine the width of some text. Under VB6 I would use the .textwidth() method pretty much any time I wished.Under VB.NET it appears that the paint event is the only place I can gain access to an initialized graphics object and from that the measurestring() method.Do I have to use a flag in the paint event when want to auto-resize my splitterbar position or is there another way?
View 5 RepliesI have developed an application with a plugin architecture using interfaces. I realized that when I release the API for 3rd party plugin development, someone would be able to create a loader program to replace my main program quite easily. Is there any way I can make the plugin dependent on my main program? All my main program does is get an icon and a description of the plugin from the DLL plugin (using the interface) and then calls the dll's interface function to create and display the form.
View 2 Replieshow you populate cascading comboboxes? I have one combobox on one form, from which I'm trying to populate another combobox on another form. The first combobox contains Locations while the second combobox contains offices for whichever location is selected in the first combobox. I would like it to work as follows: user clicks on first combobox to select a location, and then the second combobox lists all the offices for that location.As of right now, the second combobox is just displaying the first office that is in the first record for the respective database table it is pulling from.
View 2 RepliesI am using a DataGrid, in VB, I have a check box. If it is checked I turn image.visible to true. This is done within the ItemDataBound method. How can I get it so when the check box status is changed, the DataGrid is rebound and uses the if statement to decide whether to show the images or not? [code]...
View 1 Replieswhen I build I get this warning "Found conflicts between different versions of the same dependent assembly"the target for the application is any cpuI went through all refernced project/solutions - they are all any cpu, .net 3.5. There are some externally supplied dll from microsoft, sybase which I don't have control.
View 1 RepliesHow I can populate a combobox (combobox2) based on the selection made from another combobox (combobox1)? They are on different forms. Combobox1 lists locations, while combobox2 lists offices for each location. I would like it to work so that when the user clicks on combobox1 and makes a selection, the 2nd form loads with combobox2 showing all the offices for the selected location.
View 6 RepliesWhat's the meaning of this error? The first version the I had installed is the vb. 2008 express edition. Now I try to used the vb.net2008 team system. Is there any conflict with those versions that I had installed to my pc?
View 3 RepliesSo I am working on a project for class. I first hit a bump when I could not figure out how to get this to count the number of times the button was clicked. Now I have hit a road block. Here is what I have so far (I stopped where I couldn't get it to work):[code]How can I get this to remember variables which were completely dependent upon the count?The project is asking for 5 prices entered 1 at a time, clicking the button ("Include Price"). After each number is enter, I am supposed to be getting the largest, lowest, and average of the numbers.
View 14 RepliesI need to compare two dictionary values if the types stored are equal, this is what i have
if gettype(Args(key)) = gettype(argtypes(key)) then
'' do something
end if
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My software works perfect when I run it from VB 2010 Professional.However, when I use the InstallShield Limited Edition from VB it comes up with the following errors that I is giving me gray hairs to resolve.I did all types of searches and nothing seem to work.
Warning
-6248: Could not find dependent file CrystalDecisions.CrystalReports.Engine.dll, or one of its dependencies of component SMS_API_CLICKATELL.exe[code]....
ISEXP : warning : -6248: Could not find dependent file CrystalDecisions.Windows.Forms.dll, or one of its dependencies of component SMS_API_CLICKATELL.exe
I have a master page called SampleMaster.master and this page contains a Repeater control
The Repeater control will be used to display the relevant tags associated with each content page and the tags will vary between content pages
The data extraction method Tags.GetTags() is working but I do not know the best approach to populate the Repeater control in the master page dependent on what the content page is.
Would the code reside in the masterpage page code behind or the content page code behind?
Below is my code. I have a system that provides me voltage readings that changes based on a timer (interval of 300 milliseconds). I want to compile voltage readings for over 5 seconds (but I need the timer reading to remain at 300 ms) and then spit out an average of the THAT data. How do I do this? I was thinking of using datasetvalue but wasn't sure.
Public Class Form1
Private Daqboard As MccDaq.MccBoard = New MccDaq.MccBoard(0)
Private RangeSelected As MccDaq.Range = MccDaq.Range.Bip5Volts
Dim ULStat As MccDaq.ErrorInfo
Dim Channel As Integer = 0, DataValue As System.UInt16, EngVolts As Single
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I am using TPT modeling and writing the EDMX by hand as our data model is much more complex than the designer can support. My model includes a ProjectObject which has a dependent object name Project. When I query ProjectObject.OfType(Project) using Linq to SQL, I receive back data in all the fields that are inherited from ProjectObject, but no data in the fields that only in Project. I have ran a SQL Server Trace and captured the actual SQL and ran it using SSMS and it returns data there, so I am relatively certain the data is being passed back, but it seems to be getting lost somewhere in EF. Everything appears to be ok in my model, but . . .
SSDL
<EntityContainer Name="Insight_ModelStoreContainer">
<EntitySet Name="Project" EntityType="Insight_Model.Store.Project" store:Type="Views" store:Schema="dbo" store:Name="vw_insight_Project">
<DefiningQuery>
SELECT
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VS2008 / XP Pro sp3 / .NET 3.5 I develop during the day on my office computer and bring home projects on a laptop to work on over the weekend. After working at home then at work, I have a conflict that I don't understand. When I build, all is normal but when I debug, I get "Found conflicts between different versions of the same dependent assembly." If I click on the warning message I also get "Do you want to fix these conflicts by adding binding redirect records in the app.config file"?Both computers have same O/S, same SP, same .NET, same VS. Only thing that could be different is particular O/S updates that have been installed on each machine. What causes this warning and where do I look for differences? I really hate to let mSoft keep changing my code every Saturday and Monday. I just don't trust it on Mondays.
View 7 RepliesI am struggling with VB.NET's graphics paradigm.There are several times in my code when I need to determine the width of some text. Under VB6 I would use the .textwidth() method pretty much any time I wished.Under VB.NET it appears that the paint event is the only place I can gain access to an initialized graphics object and from that the measurestring() method.
View 3 RepliesIs there a way to make one list box dependent on the other based on user input. Here's my situation: A teacher has the ability to enter the name of the student into a listbox via a textbox. The teacher may then select the student from the first student list box and input grades that would go into a grade listbox. If the teacher selects another student from the student list box, the grade listbox would either go empty or show the grades inputed for the other student; all the while retaining all previously recorded grades for other students.
View 1 RepliesI have a slight problem , using vb 2008 i have written some code that checks the current datetime on the computer. This gives me the answer in the format mon, tues etc. what i now want to do is to use that to call a spreadsheet dependent on the day of the week. here is my code so far
Code:
Dim TIME As DateTime = DateTime.Now
Dim FORMAT As String = " ddd "
TextBox1.Text = TIME.ToString(FORMAT)
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Now i have tried the private sub eg SATS() on a separate button and it works perfectly . so it appears to be that the sub is not been called. I think it is probably a syntax where the datetime answer is not been recognised, in that textbox1.text = "sat" is not the same as datetime = sat .
I'm running into a little problem making one combo box dependent on the selection of another combo box. I'm using a access back-end to this project. I have two tables: MajorCategoryTbl and MinorCategoryTbl , MajorCategoryTbl has PK and description field, MinorCategoryTbl has a PK, MajorID (foreign key), and description field. I have two combo boxes on my form, one that displays the Major description, and one that displays the MinorCategoryTbl description, but the stored value is the PK for both. I want the selection of the minor category combobox to depend on what was selected in the major category combobox.
View 2 Repliesi am just trying to apply inheritance ..Below is my Code ... on which i am not getting the output on my Text_Box ... when in write it in a Child Class
Imports System
Imports System.Windows
Imports System.Windows.Forms
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Has someone a hint what I'm doing wrong in VB.Net?
Module Module1
Interface ISearch(Of T As ISearchResult)
Function ids() As List(Of T)
End Interface
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The third cast isn't working. Why? did I miss a oop lesson?
What's the choice design that microsoft do that? Of course, as of me, I don't use inheritance a lot, or at all.
View 14 Replieswe have 3 classes:Class S, class A, class B / A and B inherits S.A has a property A1 and B has a property B1.we also have a collection of objects that has A and B objects.ex.
Dim c as Collection = new Collection
c.add(new A)
c.add(new B)
Now we want to make a general object that will read from the collection.
ex .
Dim obj as S
how can we cast obj in order to see properties A1 or B1 according to the class;
Form1
Public Class Form1
Private Sub But_Bell_Click(sender As System.Object, e As System.EventArgs) Handles But_Bell.Click
MessageBox.Show("Ding a ling")
End Sub
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Where has the whistle button gone? The class part of the inheritance has works because you can access it via code.
Why VB.NET (vs C#) does not "inherit" the constructors with parameters?
Public Class StopLine
Inherits Microsoft.VisualBasic.PowerPacks.LineShape
Public Sub New()
MyBase.New()
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