Variable To Represent Generic Dictionaries?
Mar 2, 2010
In a tic tac toe game I'm working on I have 2 dictionaries (plyrPairs and cmptrPairs) In the program there is a procedure that is used numerous times. The procedure varies with the dictionary that it calls. I'd like declare a variable in a sub procedure that will represent these two different dictionaries. Here is what I have:
Here are the two enumerations:
vb.net
' Assign values to player pairs enumeration
Private Enum plyrPairsList
empty = 0
[Code].....
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May 13, 2010
I have a very large number of tables with data in the following format:
A X Y Z
1 0-2 0-13 0-1
2 3-5 14 2-4
3 6-9 15-16 5-10
In other words, there is a variable (call it A) with a single value that corresponds to a range of values in the other variables (call them X, Y, and Z).My program needs to accept user text input of values of X, Y, Z, etc. and then match each to the corresponding value of A.Example: User enters 4 in the X text box; program determines that if X=4, A=2.Again, we're talking about tables and tables of data in this format. Unaware of a better method, I have been using arrays.
Example:
Dim a() as double = {1,1,1,2,2,2,3,3,3,3...}
Dim x() as double = {0,1,2,3,4,5,6,7,8,9,10...}
Note how I had to artificially deal with variable A so that the index of each score corresponds to the index of the matching X variable.It is this modification of the variables that is taking forever. There has to be a better way! Hypothetically, what I need is the ability to do something like this:
Dim a() as double = {1,2,3,4...}
dim x() as double = {0 to 2, 3 to 5, 6 to 9...}
Is there a way to represent a range of values at a single index of an array, such as my hypothetical example above? This would save me hours of re-shaping the data to make the arrays work.
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Jul 25, 2010
I have a generic method where I want to do something special for Strings.
I've found DirectCast(DirectCast(value, Object), String) to get the String value (when I've already confirmed GetType(T) Is GetType(String)) and DirectCast(DirectCast(newvalue, Object), T) as mentioned in a number of answers to similar questions works.
But is there anything more elegant and is it performant?
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Jan 2, 2012
The following code is excerpted from a larger procedure (the surrounding code is not relevant). why I am unable to get the second ContainsKey line to return True? Hint: try this on a worksheet with just a few populated cells to reduce looping.
For Each ws As Excel.Worksheet In Wb.Worksheets
Dim dic As New Dictionary(Of Excel.Range, String)
rngUsed = ws.UsedRange
[code]....
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Jan 30, 2012
I have created a service that updates dictionaries and outputs an xml file of the contents. It will do it fine first time round, but then I get the following exception when it tries to do it the second time
system.argumentexception an item with the same key has already been added
Is there anyway I can set it so that the dictionary contents are overwritten each time?
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Jun 2, 2010
I'm tyring to pass a variable data type to a template class. Something like this:
frmExample = New LookupForm(Of Models.MyClass) 'Works fine
Dim SelectedType As Type = InstanceOfMyClass.GetType() 'Works fine
frmExample = New LookupForm(Of SelectedType) 'Ba-bow!
frmExample = New LookupForm(Of InstanceOfMyClass.GetType()) 'Ba-bow!
[Code].....
I'm assuming it's something to do with the template being processed at compile time but even if I'm off the mark there, it wouldn't solve my problem anyway. I can't find any relevant information on using Reflection to instance template classes either.
(How) can I create an instance of a dynamically typed repository at runtime?
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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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May 17, 2012
I'm strictly looking for a language conversion here of this:List<?> I already have a work around I'm just surprised that I can't find the vb.net equivalent of a variable type of a "raw" generic list that takes a wild card.Java's mechanism here enables you to reference a list regardless of what T is.Java even enables you to go further and do things like:
List<? extends Number>
List<? super Double>I tried:
List(Of )
and that did not work. That only seems to work inside the GetType function.
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Apr 16, 2012
I have the following object:
countDictionary As Dictionary(of Category, Dictionary(of Date, Integer))
The Class has a Enumeration Property. For the purposes of demonstration, I'll call it MasterCategory.I have been trying to get out an object that looks like the following:
groupedCountDictionary As Dictionary(of MasterCategory, Dictionary(of Date, Integer)
The best result I could get was:
Lookup(of MasterCategory, Dictionary(of Date, Integer))
From:
countDictionary.ToLookup(Function(o) o.Key.MasterCategory, Function(o) o.Value)
Which results in a IEnumerable (Of Dictionary(of Date, Integer)) for each MasterCategory value.However, I need that IEnumerable of Dictionary flattened to one dictionary with all the integers summed (total counts) for each date. I then tried to use various selects and group bys (from numerous stackoverflow posts) to "flatten" it, but my efforts have fallen short.
Current Code
[Category Class]
- MasterCategory As Enum
- Name As String etc
[code]....
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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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Aug 14, 2010
I have a Journal that records entries for different types: Journal(Of ParentT)
[Code]....
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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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Jun 1, 2011
I'm trying to convert old VB.NET code into C# and I'm not sure about the current line and what it means really.
[Code]....
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Jun 29, 2010
I know you can put unicode character codes in a VB.Net string like this: str = Chr(&H0030) & "More text"..I would like to know how I can put the char code right into the string literal so I can use unicode symbols from the designer view.
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May 9, 2011
Below is the code I am using to restrict user from entering any other characters except for the predefined ones. But using my code I cannot hit backspace.
How to include backspace also ?
Dim s As String = "0123456789$"
If s.IndexOf(e.KeyChar) = -1 Then
e.Handled = True
End If
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May 31, 2011
I'm creating a program that outputs Quotations (and other information relating to these 1. What is the BEST way to read/write from a database (I only really know how to use Access but if XML or SQL would be better, I'm willing to learn). The database needs to be stored and accessed from the same state every time that the program opens. I've tried multiple different ways, both through DataAdapters (in code) to doing it through connecting the database through the Visual Studio GUI. Neither have seemed to work. Other people have told me that using DataAdapters and such aren't the best way, but no one has been able to tell me what this 'best way' is. Also, I need to somehow be able to link pictures in the database - apparently it's not easy to do in SQL?[code]...
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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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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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Nov 19, 2010
I am reading a pot that has a range of 1000 to -887.I need to convert that numeric value to represent 0 to 1024Where 1000=0 and -887 = 1024.
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Oct 5, 2009
I have a parcel post assignment, and i have three textboxes that represent height, width, and length. here are my questions1. how do i decalre them as integer? do i decalre the textboxes or the labels that represent them?2. how do i multiply all three together and multiply the total by 4pence and add 20p?
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Feb 8, 2012
i can retrieve the data from the DB and put it in a vector and then, vector in a JTable, to display data in a tabular format in java, all i wanted to know is there any similar way in vb dotnet?
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Apr 1, 2009
I'm trying to set up a CLASS to represent a data stream.This is a newbie question so if the answer is obvious, please excuse me.Several of the data items are multiples which I would normally represent as an Array element.For example, in the code below, the element SolarNameplate has up to 10 instances, so I'd like to use array notation.I get errors, and it doesn't work, so I assume I can't do it like below.
QUESTIONS : 1 - is it possible to use an array element in a class ?
2 - is there another way to achieve what I want ?
Public Class SM1PS01
Private _Projid As String '... name or number of project
Private _LogoFile As String '... file containing customer logo[code]...........
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Jan 14, 2011
I'm pondering a design that will require zooming. My intention was to use pictureboxes to represent a variety of items, and I have the code written to draw on those pictureboxes, as needed. However, there will be many pictureboxes on the form at any one time, though only a portion of them will be visible. That shouldn't be a problem, necessarily, as there isn't any issue with having controls that are not on the visible area of the screen. My issue is that when the user rolls the mouse wheel forward or back, the image will have to scroll in or out, which means that the location and size of the pictureboxes will have to scale relative to the point where the mouse is located.
Technically, this would be more easily accomplished using graphics directly, since I can use ScaleTransforms and...uh...one other, to do the scaling. However, I would prefer to stick with the pictureboxes because I will be doing lots of drag and drop work with them (dragging things into and out of them), and that code is already written. If I were to change that to use rectangles and circles drawn dynamically and scaled dynamically, I'd have to use some kind of hit testing to figure out which object I dragged or dropped onto, and where. Therefore, switching away from pictureboxes would require a fair amount of recoding. There really shouldn't be a problem scaling and translating the controls on the form, but rather than writing the math behind that, I was wondering if there were any built-in tools that will do it for me or will help with the process.
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Jan 5, 2011
Dim x = GetType(List(Of )) 'valid statement
Dim list As New List(Of String)
Now I want to see if list is a List(Of T) variable: Dim isList = TypeOf list Is List(Of ) On the last line I get a compile error: "Type Expected". Is there any cheap-performance TypeOf operator alternative for generics?
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Apr 27, 2009
What suggestions do people have for a timeslot data structure? I have a number of activities and I'm planning to display them in a datagrid with days as columns and timeslots as rows. This suggests to me a timeslot data structure with 5 properties for the five days (the columns) for every value I want to use e.g. a timeslot ID and the number of slots left.
So.
Property Day1ID
Property Day1Slots
Property Day2ID
Property Day2Slots
Property Day3ID
Property Day4Slots
etc
Then each TimeSlot structure would be for a specific time. say 9:00 and another for each hour after that. Then I'd have a list of timeslot structures that will auto bind against the datagrid. I'm exploring new ground here and as you can see I'm not very clear on what/how to do it?
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Aug 10, 2009
I am creating a Point of Sale software for a small company I work for. I am a beginner with Visual Studio and have just stumbled my way around. I have completed the GUI and would like to start assigning code. The problem I am having is assigning numbers to a keypad on the screen. I would like each button to represent numbers like on a calulator of keypad. When these are pressed they need to input into TextBox2.
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Jan 26, 2010
I'm working in VB.Net developing data logging software. I've developed classes implementing a common interface that works with many of the data loggers my company produces. These classes handle the low-level hardware interfacing and expose common methods for accessing the data logger's records.
[Code]...
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Mar 25, 2010
i am working with serial communication in vb.i need to know how to get &h1 to be &ho1 to represent the byte o1 in hex or 0000 0001 in binary.i cant remeber how to parse the byte and represent it with two characters instead of one.
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Jul 6, 2011
I have a theater seating project. I am creating checkboxes in a panel that represent the seats. Each of the rows has a label on it, giving it a row number.When a user clicks one of the check boxes, I need to be able to determine what row the seat was that they clicked on. I then use the row number to determine the price of the seat. I am stumped!! I can't seem to figure out how to get the row number associated with the seat. Here is my where I am configuring the seats:
Private Sub ConfigureSeating()
intTheaterID = CInt(frmTheaterTickets.cboTheater.SelectedItem)
Dim strSQL As String
[code].....
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Apr 28, 2009
I'm trying to format a string to represent a date in a specific format using the Format function but it's return odd results.
Here's an example:
Dim s as String = "01/01/2000"
Dim result as String = ""
result = Format(s, "dd-mmm-yyyy")
result equals "dd-mmm-yyyy" (the format string) very strange.
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