I want to create a property handler in .NET. I have already implemented the IInitializeWithFile, IPropertyStore and IPropertyStoreCapabilities classes but I don't know how to implement their functions to create custom properties and display data.[url]...
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What is the code to assign a event handler value to the Text property of the appropriate label. Here is my code so far and I want the values created by clicking the button to display in the text for the associated text boxes?
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I have a class called solution. This class has a property named cost. I also have a class called solutionList that inherits List(Of Solution). I have an instance of the solutionList class in another class called solutionGroup. Within the solutionGroup class I have a property called totalCost that sums the solution.cost property for all solutions in the solutionList.
But, I need a way to know when the cost has changed so that I can recalculate the solutionGroup.totalCost. I've added events to the methods that add or remove solutions from the list but I need a way to know if someone does something like
SolutionList.Item(0).cost = 100.
How to raise an event when the cost property of a solution that is in the solutionList is changed but with no luck.
Here is my solutionList class:
Public Class solutionList
Inherits List(Of Solution)
Friend Event listChanged(ByVal sender As Object, ByVal e As EventArgs)
Public Sub New()
End Sub
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Doesn't have to be in VB.NET, could be in C# or just point me to the right registry entries that needs to be created to make this work and I am happy too.Anyways we have a windows client server application called let's say "CoolApp". Now a third party is developing a web front-end using the Interface, BL and DL dlls. They want to add a functionality when user does some specific search on a records lets say a customer with the id of 12345, and then they can send an email to anyone with the access to the application where the link in the email would look something like;
View 10 RepliesI want to create a event handler that detects a Directory created/deleted event. is it possible to do using a FileSystemWatcher?
View 2 RepliesI'm trying to create an event handler for a graphic elipse, so I can do the math in a separate "control box". There will be multiple graphic elipses feeding the TextBoxE1 box. ( As for all the note textboxes.) This is a graphic creation of a guitar neck that will tie to a 2 table database. Click on a note & it will be identified, a series of notes will call on the related scales from the database. The problem is that I need to create an event handler for each graphic elipse so the code won't fire unless the elipse is clicked on. If only one elipse in that keynote value is clicked, it will put a "1" in TextBoxE3. TextBoxE1 & TextBoxE2 will be hidden.
TextBoxE1 value = "0" until at least one "E" is clicked. ( Elipse that is valued as "E".)
TextBoxE2 value = "1"
TextBoxE3 value = TextBoxE1 + TextBoxE2
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I am developing an application and I use a 3rd party library which is basically Native excel. The problem is that this library does not implement an event which is able to notify me when the value of a cell value changes.
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Say I have an object that I dynamically create. For example, say I create a button called "MyButton":
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I am trying to learn Visual Basic and am working through a text book that my son used for a class. Each time I create an event handler by double clicking on the design page, the code that automatically populates is almost identical to the code in the book, except the byval portion is omitted from the code.[code]
View 2 RepliesI am trying to create a property which is as a class, which contains other certant properties you can edit, i.e:
Public Class exampleClass
Dim _var1 As String
Dim _var2 As Integer
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I am trying to create a delegate(as a test) for: Public Overridable ReadOnly Property PropertyName()As String My intuitive attempt was declaring the delegate like this:
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So the question is, how do I make a delegate for a property?
I'd like to do something like this:
Private _myCollection As IList(Of T)
Public Property MyProperty(Of T)() as IList(Of T)
Get
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Basically, I want to have a collection of items that may be of any type. Then, I'll be able to do something like this:
Dim myPropertyValue as <the type of some value>
if (MyProperty.Contains(<some value>))
myPropertyValue = CType(MyProperty(<some value>), <the type of some value>)
How can I do this? Or is there a better way than using a generic type?
I am trying to create a property for objects, though I am not sure if that is what it is called. For example, PictureBox.Image instead of Image I want to use my own property.
View 3 RepliesWhen you create a property in a VB.NET class how do you tell it which category it will belong to when it shows up in the property window?
View 4 RepliesI have class called "Employee" and I have a class called Department. They have an association. I need to create a colleciton of employees with the creation of a Departmant. I know how to do with using "private" member _AllMyEmployees. But I need to expose this private member using properties. therefore how do i covert thsi private member to a property? [code]
View 2 RepliesHow to create a property like combobox?
View 6 RepliesMy final goal is to have a property contain 2 values, the first value will be used the normal way you would in a property,
Eg.
myClass.myProperty = "myName"
dim str as String = myClass.myProperty
and the second value, will be metaData,
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I have created a new user control (ctlMyBox) with a bunch of labels, textboxes, and a picturebox. I learned how to add simple custom properties (strings, integers..etc) to it using the "Public Property..etc" method.
However, as an example, I also want to add a "Theme" property with only three options (Light, Dark, and Colorful). Depending on the theme chosen for the control, the colors of the different labels will change.My current (primitive) solution to this is making the Theme property as a String, like so:
Code:
Private strTheme As String = "Colorful"
Public Property Theme() As String
Get
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This would require the user to know the exact names of the available themes. What I want is that when someone is coding to change the theme, a list of options would appear after writing ctlMyBox1.Theme = . The user would then select one of the three options, similar to when you select the checked state property of a checkbox for example. Unfortunately I don't know how to do this?
I have created a little demo application which is able to create a meeting request by using the Exchange WebService (EWS). I would also like to add some custom properties to this item but up to now I have only found examples which use the Exchange Managed API, which I won't use. There must be a way to create these properties by only using EWS... Does anybody know how and can provide a little code example?
View 1 RepliesI was wondering how I could create a property for DataGridView Items. I'd like each one to have a property called "Flooded" for this game I'm making (I thought it would be funny to make a game outside of an actual game engine). Can I declare a property or anything?
View 13 RepliesI've recently taken over a MVVM project started by someone who's now left the company; It's my first time using WPF, but by the looks of it, it was his first time using both WPF and OOP...Anyway, I've got a ListView in the XAML, and I've got a collection class which doesn't currently contain a "SelectedItem" property.what code I need to put in to link the SelectedItem of the ListView to the as-yet-unwritten SelectedItem property of my collection, and then what code I need to put in so that the SelectedItem of the collection links back to the ListView?
View 2 RepliesI am currently learning VB.net but for a project I need to create and array and pass it using a property. The data to be passed will be a train's destination, the time its due and the expected time of the train. I was wondering if someone could simplly explain how to first produce an array and then show how to pass it to a custom control
View 1 RepliesI'm having some trouble with a class that uses the ToolStripControlHost, I have to create a label and a label beside the textbox, this works, the problem now and I can not access the property. Text of textbox (txt). the class to this:
Public Class ToolStripTextBoxWithLabel
Inherits ToolStripControlHost
Public Event TextoAlterado(ByVal sender As System.Object, ByVal e As System.EventArgs)[code]......
I'm building an abstract class that handles some common operations for all of my data access objects. The class will utilize generics, so I can't make direct calls to constructors, business object properties, etc. Reflection is way too slow for what I want to accomplish, so I am using a DynamicMethod, ILGenerator, and Delegate caching instead (sample will follow).
The method I'm currently working on is a Private Shared method that populates a list of business objects using records from a data table. I'm having a problem building the property setter via IL. I'm getting an object reference error, but I'm not sure how to fix it. I believe the error comes from the "target" being Nothing, but the parameter I'm passing as the target is not Nothing at the time of invocation. Here are some snippets of what I've got so far:
'class declaration -- TList is strongly-typed list of T
Public MustInherit Class DataAccessBase(Of T, TList)
...
'delegate declaration
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I'm assuming the obj is not being passed correctly as the target, thus causing the target to be Nothing.
defauld the usercontrol create(when is used) the backgroundimage property, but these property can be blocked? i'm asking these, because i need the entire control in that property
View 11 RepliesIs there a (simple) way to connect a textbox, label etc. to a property in a class?I have a project with a complex series of dialogs to enter data into a list of a costum class describing an experiment with many parameters that are stored as properties (both simple variables such as strings and integers, but also more complex ones).I need both to be able to update the list of my experiment class, but also to go the other way to populate the dialogs from the class.It can of course be done outside the class and the dialogs in separate subroutines. This however, quicly becomes unmanagable and hard to maintain as the dialogs and experiment class is expanded with new elements.If there was a simple way to connect say a textbox or label in a dialog with the appropriate property holding the information it would make it much easier.
View 5 RepliesI`m looking for a way to parse a parameter name like linq does.I want to filter before i download the date from the database.With LINQ the data is already red into a dataset. I only want to select data from the database witch i need. how i can send a property name to a function without using the property name as string and without to use to mutch code inside the function and without creating an instance of the object, etc.
Module
Module1
Dim user
As user =
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how to create my own custom property that is an object but that allows a string to be passed in to the property grid to configure it.For example, with a font type property you can type "Microsoft Sans Serif, 18pt" into the property grid and it will create the appropriate font structure and fill it.
View 5 RepliesI want to use SetPropertyItem to add a new property to an image ...
how can i create a new System.Drawing.Imaging.PropertyItem without first reading a property from an image and changing its values? as this seems somewhat counter-productive
I have two properties ("FIRST_NAME" and "LAST_NAME") I need to access as a single property (e.g. "FULL_NAME"). Is there a way for me to add a property to my entity model that contains the combine value of FIRST_NAME and LAST_NAME?
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