Basically I have a system that will take an unknown structure (that should be marked serializable) and attempt to serialize it to a stream. However, before the system will do that, I want to know if there's a way to check every single variable/property to make sure that all the types are serializable.Anyone know a way?
EDIT: For now, I was able to do this:
Private Function IsSerializable(ByVal obj As [Object]) As [Boolean]
If obj.GetType.IsSerializable Then
Is there any performance hit (or other problem) to creating a lot of class and structure types for a project? I'm not talking about the number of objects existing in-memory during runtime; rather just defining a lot of object types during design time. I find myself making a lot of small classes and structures that are little more than simply packaging a few related variables together.
Is it okay for a structure variable to hold a small number of reference types? I thinks it's fine because the pointers themselves are not that big, regardless of what they're pointing to. But I never did fully figure out the whole heap/stack thing, so I'd like to make sure.
I am using a structure array with multiple member names with 2 types. My question is can you single out one of the member names and add its total? kinda like this...
HTML Code: structure structureName dim a as string dim b as double dim c as double
In VB.NET I would like to create a complicated data structure with multiple types of data stored in an array like format (see below). I am trying to create a data structure that would look something like this: [Name; xLoc; yLoc; zLoc; [Jagged Array]] Note: Name needs to be dimensioned as a string, xLoc and so forth as integers. The Jagged Array would look like this:
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.
I've been following this article:and have everything working.Under the Support for Custom Types section, it introduces a collapsable type for the spell check options. The option are added together to produce a string that is displayed in the grid in the Spell Check Options row. Is it possible to get this string directly from the 'AppSettings' class or do I need to add another property and copy the code from the ConvertTo and ConvertFrom functions?
I'm making some cataloging software that will catalog all the items in our shop, and I'm saving the data [structure] as an XML file through the following code.However, I'm not sure as to how to convert it back to a structure.
I am currently working on a program for my class. The user puts in two numbers into two separate text boxes and then my program takes those numbers and puts them through several arithmetic equations such as sum, difference, product, etc and displays them in a listbox. I have that part of it done. Now I have to make it so the users can only enter numbers ranging from 1 to 10 in each listbox. If they enter anything besides that I need a message box to show up telling them to only enter numbers between 1 and 10.
I have a form with four chart controls on it and i would like to count them at runtime but i'm hitting a snag.
For Each ctrl As Control In Me.Controls If TypeOf ctrl Is System.Windows.Forms.DataVisualization.Charting.Chart Then Label1.Text = ctrl.Controls.Count End If Next
the count is returning zero when it should be returning 4 - what am i missing?
Module Module1 Public Structure structure1 Public TRANS() As structure2 End Structure Public Structure structure2 Public X() As Integer End Structure End Module
Each time i type codes in the Visual Basic 2010 IDE (Visual Studio 2010 Ultimate Edition) and compile it to run, i keep getting this nasty error report below
Error 1 The "GenerateResource" task failed unexpectedly.
System.DllNotFoundException: Unable to load DLL 'FileTracker.dll': A dynamic link library (DLL) initialization routine failed. (Exception from HRESULT: 0x8007045A) at Microsoft.Build.Shared.NativeMethodsShared.InprocTracking.StartTrackingContextWithRoot(String intermediateDirectory, String taskName, String rootMarker)
I'm current using this to populate a listbox with some data:[code]I want to do the same but using a datagridview. It's possible to use the structure I already have to populate a datagridview? I searched but found nothing about that.
I have created a structure with some variables that I'm trying to update during the course of a sub routine but they are not updating, when I cycle though them at the end all the variables are still set to 0.
Imports System.Data Imports System.Collections Structure Team
I'm having a bit of an issue with this program I have been working on for my class. It's a future values calculator, that takes a single data type, decimal data type and a integer data type does the formula and then spits back out the Future value. What i'm having difficulty with is converting the string over.
Public Class Form1 'Define the Module level variables Dim FutureValueInteger As Integer
I am using Visual Studio 2010 Prof. In C# I can create my own Enumerator and use it like this:MyEnum value = Now, Intellisense will suggest a value of MyEnum. In VB, when I write:Dim value As MyEnum = I get a huge list of every types. When starting to write my enumerator value (could be a word like "sunny") it filters out some types but I would like to have it like in C#. Anyway I will use the MyEnum type and no "String nor Objecte nor IntPtr...".
In Vb6 you could make a private type by doing the following:
Private Type PointAPI X As Integer y As Integer End Type
Vb.Net doesn't support this. I need it to store the x and y position of a certain pixel. I know i could just declare an x and y variable but i would rather use something like:
I want to design a application which can support two different types of databases same time e.g; when we install, it will ask which db it has to support and based on initial selection it should work with any db without changing anything in the application.In short it has to be developed keeping in mind that user may have either MS SQL or MySQL. It should support both.
The following Code throws the InvalidCastException error. What I wish to know is why and what the standard workaround is for this situation.
Module Module1 Interface IFooBar End Interface Class Foo : Implements IFooBar Public Shared Widening Operator CType(ByVal Val As Foo) As Bar Return New Bar
[Code]...
What I would like is the line B = C to work without me having to know what type of object C currently is. I need to find a way to get this to work so that i can finish a function I ma working on so that it will excecute correctly on any new object which implements the interface and boasts an Operator CType function to cast it to the type used in the function.
First post here so Im sorry if im posting in the wrong place. Im trying to build a simple poker game which requires the program to recognise hands of each players. Luckily there are 3rd party solutions such as pokereval. However my problem comes when i try to convert a C# ported version of pokereval by Keith Rule, into vb.net. The following error shows up referring to the line with the *.
I'm new to VB 2008 after having spent a long time with VB6, so I apologize if this is a stupid question. But I'd really like to have this straightened out.
Let's say I have a pretty large structure that has lots of properties.
Code:
Now say that I want an internal database with about 10 instances of this structure total, describing, say, 10 different products that a store sells. When these values are loaded from a database, they remain totally static. (However, they can be different each time a program loads)
Now say that I have a class. Each instance of this class is a type of that BaseProduct structure. Meaning, each instance of the class pertains to one of the 10 types of products that the store sells. However, this class has additional properties that pertain specifically to each instance, which are not static.
Code:
Now, the problem here is... If I have 200 different transactions, each one contains an instance of BaseProduct. BaseProduct is HUGE, and is largely redundant (only 10 types possible), so I think it's a little silly to include a whole copy of it with EVERY transaction. However, the Transaction class really needs information regarding the base product it pertains to. Is there a way to, instead of declaring a New BaseProduct in the Transaction class, to simply make one of the properties of the Transaction class a pointer to a BaseProduct variable?
In VB6, I would accomplish this by making a BaseProduct(10) array, and then giving each Transaction an ID number referring to an entry in that array. But in VB 2008, using class structure, this is impossible. I can't define the BaseProduct(10) array outside of a class in a namespace, and if I define it in the actual application's form, then the class loses modularity since it relies on the application that's using it.
I am trying to communicate with an external device and i am trying to send a byte array to the external device via sockets but i am always getting a response the message size is too small so i am not sure what i have done wrong. Between the data type there should be no alignment present and all numbers are represented in little endian format. The char array is not null terminated as mentioned in the protocol specifications.
I have to send data based on a struct that embeds 2 other struct. So here's my vb.net code for the struct used to convert to byte array and the sending part.
Public Structure MESSAGETYPE_OIP_Login Dim Header() As COMMANDHEADER Dim UserName() As PSTRING
I have a byte array and I want to read it using a structure. This is a common situation with structured files having information in various places in the file and it's much easier to read the data if it's mapped with a structure. BitConverter would be great if it worked with Structures, but it doesn't. Basically, I want to read the same memory address either as a byte array or as a structure, or have a function that works like vb.net MyStructure = BitConverter.ToStructure(bytearray(), position) Maybe there's a pointer method to do this?
I am trying to convert text in a text box (txtEventDate.Text) to a date type in a structure: ThisEvent.EventDate (declared as date). The text in the textbox is of the form: 05/18/1927 (i.e. May 18th, 1927) and after looking long and hard thru the forums attempting several different things, like:
The code is commented out because none of them convert the string to a date value (I know a date does not have a format and I have looked thru the MSDN). How can I stay logged and composing a thread past some arbitrary time limit that forces a re-login?
I am enrolled in a college course using Visual Basic 2010 Express.My current assignment calls for the following:Create a small program that allows a user to enter the total amount of purchases for the purpose of calculating rewards points based on the purchase totals vs. their membership level of basic, standard and premium.The user selects their membership level via 3 radio buttons, basic, standard or premium.
The total of purchases and their rewards points depend on the membership level. Example, if you are a basic customer and your total purchase is under $75, you receive 5% in rewards points (70 x 0.95). Additionally, if the total is between $75 and $149.99, you receive 7.5% rewards.Here is what I have so far, but I am getting errors on the ElseIf statements:
If basicRadioButton.Checked = True And totalTextBox.Text < 75 Then rewards = total * 0.95 ElseIf basicRadioButton.Checked = True And totalTextBox.Text > 74 AndAlso totalTextBox.Text < 149.99 then rewards = total * 0.925 ElseIf basicRadioButton.Checked = True And totalTextBox.Text > 150 Then rewards = total * 0.9
