Get A Class Properties Underlining Variable?
Jan 5, 2010Is it possible to get a Class properties underlining variable.because GeValue / SetValue need and object to work with.
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How To Underlining Strings
Dec 14, 2009For example, my string is this
Dim thisString as string ="Elephant Tails:"
Dim field(0) as string = "Appalachian Mountain"
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Underlining When Printing?
Apr 1, 2010I have a question regarding printing using the e.drawstring method. My question is: how do you get items you print to appear underlined? I have posted my code below, however when i try to add ".underline" after "headingFont," I get an error stating that: "Overload resolution failed because no accesible 'Draw String' can be called with these arguments.
Private Sub PrintDocument1_PrintPage(ByVal sender As System.Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs) Handles PrintDocument1.PrintPage
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Can't Inherit Shared Properties From A Base Class In A Child Class?
Dec 29, 2010This is another one of my "I think it's not possible but I need confirmation" questions.I have a base class for a bunch of child classes. Right now, this base class has a few common properties the children use, like Name. The base is an abstract class (MustInherit)Technically, this means that everytime a child class is instantiated, it lugs around, in memory, its own copy of Name. The thing is, Name is going to be a fixed value for all instances of a given child. I.e., Child1.Name will return "child_object1", and Child2.Name will return "child_object2".
View 1 RepliesClass With Class Properties: AObject Reference Not Set To An Instance?
Aug 19, 2009I have a class in which some of the fields are also classes.I can put values in the "normal" properties, but in the others when o try to assign values it gives the: "Object reference not set to an instance of an object"But the code compiles fine.
dados_Defenicao = New ServiceReference1.draftClaimEntryDefinition
dados_Defenicao.arCode = "123"
dados_Defenicao.claimMarket.warrantyType = "w" - Here it gives the error
How can i fix this ?
Class With Class Properties: Object Reference Not Set To An Instance
Aug 19, 2009I have a class in which some of the fields are also classes.
I can put values in the "normal" properties, but in the others when o try to assign values it gives the: "Object reference not set to an instance of an object"
But the code compiles fine.
dados_Defenicao = New ServiceReference1.draftClaimEntryDefinition
dados_Defenicao.arCode = "123"
dados_Defenicao.claimMarket.warrantyType = "w" - Here it gives the error
Class Inheritance Object Variable Or With Block Variable Not Set?
Sep 26, 2011i had a class called Tag with a structure like:
public class Tag
private _members
public properties
public shared database_methods
end class
this class was tailored for mysql database. i'm currently adding access 2007 support so i split tag into tag and tagdata with structures like:
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Inside The Service Class, Declare A Class Variable Named Started?
May 8, 2012Create a class named Service. Inside the Service class, declare a class variable named Started. The datatype of this variable is Boolean.Public Class Service Dim started as Boolean End Class Create a class named Server. Inside the Server class, declare a dynamic array that can contain elements of the type Service.(Note: For convenience, both the array and the variable Started can be accessible from a client program that creates an instance of Server and Service respectively)
Create a constructor for the Service class. When the constructor is executed, it will set the value of the class variable Started to True. Create two new classes: WebServer and DatabaseEngine. Both of these classes inherit from the class Service. Inside the Service class, declare a Sub procedure (method) named Terminate. This method should display the following text Service stopping in a message box when executed.This method can be overridden in classes that inherit from Service class.
Inside both the WebServer and DatabaseEngine class, override the method Terminate inherited from their base class Service. Both methods should first call the base class Terminate method. The messages Web server stopping and Database engine stopping should also be displayed in a message box when the Terminate method for the WebServer and DatabaseEngine are called respectively. These messages should only be displayed if the Started variable inherited from their base class is not equal to False.
Inside the Server class, declare a method named Shutdown. This method does not return any value. When executed, it will call the Terminate method for each of the Service instances (if any) in the arrServices
array. You should call the Terminate method within a For Each loop that loops through the elements of the arrServices array.
In the Sub Main method, create an instance of the class Server. Set the size of the arrServices array in
your Server instance to contain 2 elements. Create first a WebServer instance and then a DatabaseEngine
instance into this array. Call the Shutdown method from your Server instance.
Unable To Use An Instance Of The Nested Class Through A Public Variable Of The Parent Class?
Jun 7, 2012I want to created a nested class that can only be visible to and instantiated from the parent class.But I also want to be able to use an instance of the nested class through a public variable of the parent class.I tried making the nested class private, or making the nested class' constructor private, but it won't compile.Is it possible to do this in .NET?
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C# - .NET: Getting A Class To Copy Properties Of One Class To Another?
Nov 10, 2010I wrote a function that copies the properties of one class to another so make a copy of an object.So something like
MyObject myObject = myOtherObject.MyCustomCopy(myObject)
where myObject and myOtherObject are of the same type. I do it by bascually doing
myObject.prop1 = myOtherObject.prop1
[code]....
I am pretty sure in the past I used a .NET object that automaticaly did this, by reflection I guess, but can't remember it ... or an I imagining that such a method exists?
Can't Set DataTable Class Level Variable = Class Table Property?
Sep 29, 2011I have procedure (Import) that calls a for a new instance of frmImportData. I also have a class name clsBatch that has a data table property called prpParametersTable.For some reason, I get an error (indicated below with ERROR>>>) when trying to assign prpParameterTable to cv_dtImport2. The error states "Object reference not set to an instance of an object.". Why does this error not happen when I assign dtBP to cv_dtImport1? Both cv_dtImport1 and cv_dtImport2 are equal to Nothing and in my Import procedure dtBP = prpParametersTable.
Public Sub Import(ByVal clsB As clsBatch)
Try
Me.cv_clsB = clsB
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Class Property Usage - Unable To Retrieve A Variable From On Class
Nov 14, 2009I have three class files, accounts.vb and transactions.vb in addition to my form.vb. I am unable to retrieve a member variable from on class from inside the other. When the combobox index changes, the program loads the correct account (checking or saving) from two different sequential files. I don't think I have the calcBalance procedure in the correct class file. And that is what I am having trouble with. Accessing it to display it. [Code]
View 1 RepliesVariable Class Names - Rename My Class Human To Man
Dec 18, 2009What i'm trying to do:
I've got a library which includes a class:
Class Human
End Class
and another class which refers to the human class
Class ASD
Private somevar as new Human
End Class
Ok now i've got a problem, i wish to rename my class Human, to Man. i've got to change Human to Man 2 times, which is OK but the problem is that in the real case, its not just 2 times, its like 500 times or more.
Well its something like a PHP on Javascript.
the following shows the solution of what i'm trying to do, but its in another language PHP/Javascript:
note: in php $ sign declares a variable, echo writes the variable out
CODE:
Is there anyway to do that with VB?
Using Properties (rather Than A Public Variable)
Jan 19, 2010Is there any point in using a property (rather than a public variable) if it just says:
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Defining A Global-class Variable Before The Class Is Used?
Jan 31, 2011I have the following code:
Option Explicit On
Imports System.DirectoryServices
Imports System.IO
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Access Properties Of EventSender Object Variable
Jan 6, 2012I have the following code from a textbox leave event:
Private Sub txtdebt_Leave(ByVal eventSender As System.Object, ByVal eventArgs As System.EventArgs) Handles txtdebt_0.Leave, txtdebt_1.Leave
Dim txtbxName As String = eventSender
CType(eventSender, TextBox).BackColor = System.Drawing.Color.White
search_index = Val(VB.Right(txtbxName, 1))
End Sub
I would like to assign the name of the textbox to the variable txtbxName.
I know it's within eventSender as I've seen it when drilling down but how do i get it out??
Creating New Instances Of Form1 With Variable Properties
May 13, 2009I'm trying to elaberate on some basic examples of .Net programming in using VB. The basic example of creating a new instance of Form1 is:
Dim x as New Form1
x.Show
I've added some OptionButtons to set the StartPosition of the Next Instance of Form1 as well as some Labels that display the Top, Left, Width and Height properties when the new instance of Form1 is Shown.
This is the code I'm using.
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim x As New Form1
If Me.RadioButton1.Checked = True Then
x.Top = 0
x.Left = 0
[Code] ......
Declaring Private Variable - Automate Properties?
Sep 28, 2009I come from C# (use VS 2005, .NET 2) and I know that when I declare a private variable I can "extract" from it the corresponding "property". In VB.NET I've declared a lot of properties (in the diagram class designer). Now am I forced manually adding the corresponding private fields?
View 4 RepliesManipulating Object Properties As A Variable With Code
Nov 4, 2010I would like to use a loop to manipulate a set of objects on the form. This is like using a control array but not,... Here is some code to consider:
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One Reference A Control As Variable And Change It’s Properties?
Mar 14, 2009In vb.net 2005 how would one referance a control as variable and change it"s properties. Such as in control X visible = True. Tryed string manipulations that did't work.
View 1 RepliesUse CType To Change An Object Variable "obj" To Custom Class That Reference Using A String Variable Like Obj.GetType.Name?
Feb 9, 2011The code below works for the class that I hard coded "XCCustomers" in my RetrieveIDandName method where I use CType. However, I would like to be able to pass in various classes and property names to get the integer and string LIST returned. For example, in my code below, I would like to also pass in "XCEmployees" to my RetrieveIDandName method. I feel so close... I was hoping someone knew how to use CType where I can pass in the class name as a string variable.
Note, all the other examples I have seen and tried fail because we are using Option Strict On which disallows late binding. That is why I need to use CType.I also studied the "Activator.CreateInstance" code examples to try to get the class reference instance by string name but I was unable to get CType to work with that.When I use obj.GetType.Name or obj.GetType.FullName in place of the "XCCustomers" in CType(obj, XCCustomers)(i)I get the error "Type 'obj.GetType.Name' is not defined" or "Type 'obj.GetType.FullName' is not defined"
'+++++++++++++++++++++++++++++++
Imports DataLaasXC.Business
Imports DataLaasXC.Utilities
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Class Properties Won't Set?
Jan 22, 2010as you might guess from the variable names I'm making a game (but this problem isn't game related!) which involves multiple "bullets" moving along straight trajectories. This is my attempt at changing my code for firing one bullet into one for firing many bullets at once. It works perfectly except for one thing.The class I made (BulletClass) to contain all the things needed to move the bullet isn't setting all of its properties correctly. I apologise for the walls of code however I wasn't entirely sure whether I should chop bits out. I wanted to colour code my code so that you could scroll through and see the subs where things have gone wrong, but apparently I can't even code a new thread. Let alone a video game. Instead I'll just list them, you can search for them if you like or just scroll through at your leisure.
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In a nutshell: the properties TargetPosY, TargetPosX, ShipPosX and ShipPoseY are not working properly. As a result the calculations involving them are skewed and the bullets always travel directly downward.
Dynamic Bind Variable Queries Using Properties Looping?
Feb 8, 2012I have a class with properties in it . The properties in it are all named the same with the columns names in the database.The reason for that is that i want to loop through all the properties within the class and dynamically create an sql query with the parameters in it . Then dynamically create the parameters and add them into the oraclecommand , everything works well until one of the properties ( QTY ) is set to 0 . When it is set to 0 , during the properties loop ,it will check it as nothing and bypasses the QTY property , with that i am missing one of the columns.class with properties , Notice the property Qty it is Nullable(Of Integer) , it is because when inserting data into the database , sometimes i would want it to be null instead of default 0 .
Public Class HDB
Public Property BONum() As String
Public Property Owner() As String
Public Property Qty() As Nullable(Of Integer)
[code]....
Class Properties To DataTable?
Feb 7, 2009I've got a Dictionary collection of a certain class with dozens of string properties.i'd like to create a datatable from this info and map these properties into Datatable columns, and for each member of the dictionary maps it to a row...
i could type out column names based on the class properties, but thats a bit specific and hard coded.
What I want to do is something like
Dim mytable as datatable For each string_property as property of myclass Dim column as new datacolumn(string_property.name) 'column add to table etc Next I'm unfamiliar with how to do this, maybe the Reflection classes are useful - perhaps the guru's can point out an efficient solution?
Clear All Properties In A Class?
Jun 9, 2010Is there a way to clear all the properties in a class, because i have a class where all my properties were stored, can i clear all those in just a short code?
View 6 RepliesDll - Public Properties From Another Class
Mar 8, 2012I've tried searching... a lot for the answer, but as I'm not too sure what exactly I'm trying to do I can't seem to find anything. I'm trying to write a dll in order to handle errors thrown from a vb.net app. In the dll I need several forms (I'm not totally sure if they can have forms - I'm a bit of a newbie when it comes to dll's) for which the user can type in their message about the error and submit it.
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Get Numbers Of Properties In Class?
Apr 17, 2010I have dynamic class with varied numbers of property. At one time I need to save all data from this class. So, to do the For/Next or Do/Loop, I need to know, how many properties in class for now? Is it possible to findout the property numbers and after - property names list?
For example. I have a class INI, were was .Path as preexisted property. Then the few properties has been added and INI start consist of .Path, .Size, .Color and something else.
I dont want to keep in mind all properties has been added. All I want to get some simple loop to read all properties names and values to dump it to the file. Some sort of this[code]...
How To Change Properties Of Class
Feb 28, 2009I am filling a form with values from a class, which is working fine. But now I want to take the changed values in the text box and modify the class. For some reason I have not been able to get the syntax.
View 6 RepliesHow To Count Properties In A Class
Nov 20, 2010I have created a class named CustomerType - CustomerTyp, which includes 4 properties - ID, Name, Number, Selected. I need to make a code, which determines how many properties has the class.
View 2 RepliesHow To Get All Class Properties By Type
Mar 19, 2012How can I get all the properties of a class that implement a specific base class or interface? I have a properties class that contains several other property classes. Some, not all, of these classes implement an interface. I would like to know if it's possible to iterate over all properties of parent class for child-classes that implement the target interface. It sounds like a job for reflection? I'm just not sure how. Can it be done via the "PropertyInfo" object?
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