Building Custom User Control - Default Property Of Class?
Jan 22, 2012
If we say blue is the default colour of the Backcolor property I understand it as if you don't specify a colour for Backcolor blue will be its colour. But I could not make sense of default property of a class in the context of building a custom user control. After calling an instance of a class we have to either call one of its members or assign an other object for it. Therefore why should there be a default property?
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Nov 29, 2011
Is it possible to create a user control with a list of custom class type property? If it is, how can I? The issue is that, in designer mode the property is not displayed in property window. I can add the list on markup but when i switch to the designer mode it gives an error which is 'The user control does not have a public property named BookList'.
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Mar 27, 2011
I created a Custom Class and Implemented a Type Converter for it. I used this Custom Class as a new property of a Custom Control.Everything is fine at design time. I can set the values of this property but at run-time the values i entered resets back to the initial declaration i made.
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Aug 24, 2010
I am creating a customised version of the ListView control and there are several of the properties that a ListView has that I would like to be set to a different value to the ListView default when a user goes to use my user control.
From what I've found there seems to be a number of people suggesting just set them in the constructor, but to the best of my knowledge that would just mean that the user would not be able to change the properties in the PropertyGrid in the VS IDE.I assume this is probably something extremely simple that I have overlooked.
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Mar 6, 2012
I have a custom control and would like the properties to be mandatory (not default) when a programmer codes the control. Is there a good way to do this without throwing exceptions in the program?
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Apr 14, 2010
While implementing this article,i cant understand what they try to mean by this:Still in the Code Window, change the line that reads:Inherits System.Windows.Forms.UserControl So that it reads:Inherits System.Windows.Forms.Button..if i change this line of the designer form: Inherits System.Windows.Forms.UserControl to this: Inherits System.Windows.Forms.Button...then when i return to the designer,i am getting this error: The designer cannot process the code at line 22: Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!) The code within the method 'Initialize Component' is generated by the designer and should not be manually modified. Please remove any changes and try opening the designer again.
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Apr 2, 2010
I am new to classes, and I am new to Visual Basic in general, but I am working on a multi class program. The code seems to be correct, but I am trying on instantiate a class oject with the code:
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Jul 4, 2012
I am making a new class that requires a lot of input information. Some of the properties need to be set to a default value, however I do not want to hard code them into the class.
What do you think would be the most efficient way to populate these properties?
I've been thinking of making a new class to hold all the default props and pass them as one object into the new class as a single argument but it seems kind of clunky.
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Sep 16, 2009
Given a simple class like this:
Public Class clsOB
Implements System.ComponentModel.INotifyPropertyChanged
Private _Frequency As Double
Private _Value As Double
Public Event PropertyChanged(ByVal sender As Object, ByVal e As
[Code] .....
And then I'd like to do something like this:
Dim
o As
New
clsOB(50, 30)
o = 31
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Oct 28, 2010
I am getting a strange error when I try to build my solution. The error occurs when I am calling the oGetHeaderValue function and passing the parameters.
Dim oGetHeaderValue As New clsGetHeaderValue
Dim returnString As String
returnString = oGetHeaderValue(strInvoiceNumber, strOrderNumber)
The error message is: Class 'clsGetHeaderValue' cannot be indexed because it has no default property.
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Jul 11, 2011
I have an ASPX Custom Control which is supposed to load it's properties into an internal collection (defined with PersistenceMode.InnerProperty). Here's the ASPX
<cc:CustomControl runat="server">
<Queries>
<cc:QueryTypeOne ... />
[code]...
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Mar 11, 2011
What i am having trouble doing is set the current parameter to the current row at a specific column like e.row[column index]
For Each trow As TableRow In table.Rows
cmd1.CommandText = "dbo.directway"
cmd1.CommandType = CommandType.StoredProcedure
cmd1.Connection = conn
[code]....
Class 'System.Web.UI.WebControls.TableRow' cannot be indexed because it has no default property.
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Jun 15, 2010
I know this is really picky, but can I have one template inside a user control:
<uc:MyUserControl runat="server" ID="test">
<div><b>Test</b></div>
<asp:PlaceHolder runat="server" id="pH" />
</uc:MyUserControl>
Instead of what I have now which requires me to:
[Code]...
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Aug 16, 2009
how do i set the default size of a custom control ?
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Mar 20, 2011
I'm trying to add validation to one of my class properties:[code]The value for the golfer's handicap comes from a oombo box on the form. Even if I have nothing set for this property at runtime, my validation doesn't work. I tried putting the If statement under Get instead of Set, and tried mHandicap = value after an Else in the If statement, but nothing seems to work. I'm working in the dark here and can't find anything suitable online. I was hoping to not go down the path of ReadOnly or WriteOnly properties as I'm not at that stage yet, but does this make a difference for my purposes here? Can anyone guide me as to what I'd need to do from this point? If I've got it right, you can add validation in the class and this means that you then don't need to repeat this validation in the form??
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Dec 18, 2009
I have a For Each block loops through a list of objects, the objects are all instances of a single custom class I have made which has multiple properties.The logic used in this block uses a property of the custom class to do a set action, is it possible to dynamically supply which property it uses in the logic? This will be more efficient and prevent me from having to create this logic over for each property of the custom class.My best guess was that maybe it is possible with reflection, however my searches into reflection have left me more confused.
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Jun 8, 2011
I have a custom class named Location with multiple properties.
[Code]....
How can I get the value of each p.Name and return "Main St", "AnyTown" o "USA"
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Jan 12, 2012
I am inheriting my own DataGridView (say MyDataGridView) from the standard DataGridView control. What I want is that certain properties of MyDataGridView should have a different default value than what its base have. For example, AllowUserToAddRows, AllowUserToDeleteRows, AllowUserToResizeRows properties should have the default values of False; so that when I drag MyDataGridView into a form in the IDE, the default values shown in the properties grid should be False. Later on, if I want to change them to True from the grid, they will be set accordingly.
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Sep 3, 2009
i create my custom combobox control and i'd like to set DropDownStyle property on DropDownList but it not works correctly. [Code] When i put my custom control in my form i want to see DropDownStyle set to DropDownList and not DropDown as default.
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Feb 14, 2012
Currently when i add my control to a form and double click it it adds a sub with the handle control.load to the code but i want it to be control.click when i double click it
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Jun 3, 2010
I am trying to create a settings class.The Property Test() is a list of strings.When I add a string such as: t.test.Add("asasasAAAAA")I want it to autmatically turn lowercase. using t.test.Add(("asasasAAAAA").ToLower) will not work for what I need. [code]
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Jan 12, 2012
I am inheriting my own datagridview (say MyDataGridView) from the standard datagridview control. What I want is that certain properties of MyDataGridView should have a different default value than what its base have. For example, AllowUserToAddRows,
[Code]...
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Jun 23, 2010
I have been trying to create a custom control based on the ListBox called FileListBox. I followed Microsoft's walkthrough but am having some trouble.
What I want is to add another property to the ListBox called SafeItems which is an ObjectCollection of strings (like the Items property). I will use the Items property to store a collection of Filenames as strings and I would like to store the corresponding SafeFilenames in the SafeItems collection.
This is what I've tried:
FileListBox.Designer.vb
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Partial Class FileListBox
Inherits System.Windows.Forms.ListBox
[Code].....
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Jan 5, 2010
I am trying to create a property of type string array (if this is possible).....and I seem to be lost.
I tried the following, but it says "String cannot be converted to '1-dimensional array of string'" at the return
Private _strZipList As String()
Public Property strZipList(ByVal i As Integer) As String()
Get
[Code].....
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Nov 3, 2011
I am trying to use a custom colour scheme for painting my menustrips, toolstrips etc. To do this, I am implementing a custom ToolStripProfessionalRenderer.
Normally i would simply set the renderer of each toolstrip etc. to a new instance of a ToolStripProfessionalRenderer instantaniated with a custom ColorTable i.e.
Dim myRenderer As ToolStripProfessionalRenderer = New ToolStripProfessionalRenderer(New MyColorTable)
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Aug 23, 2010
I made a custom button by inheriting the Button class. When I double click the custom button in Designer, it makes the event handling function for MyButton.Click:
Private Sub MyButton1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyButton1.Click
End Sub
[code]....
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Apr 3, 2010
I have created a custom class, which contains a panel and a label on it. I added to this class a pcaption property, which holds the label text. This property is browsable and I can change its value.But when I drag the custom control to the form and change the pcaption property, it has no effect. Even the <Defaultvalue> has no effect. Why?
Here is the class code:
Imports System.ComponentModel
Public Class mypanel
Inherits Windows.Forms.Panel
Private panelcaption As String
[code]....
Color values are unimportant, you can change it.
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Jun 19, 2009
I have several custom classes in a VB.NET (VS2008) project which are related to each other through generic list collections. The lower tier classes refer directly to some of the parent classes (to make it easier to refer backwards up the chain). My question is, is it possible to add the reference to the parent class when the item is added to a collection, when that collection is a property?
Below is some sampling of code to illustrate.
Public Class FlexServer
Private m_FlexLicenses As List(Of FlexLicense)
Private m_Modules As List(Of FlexModule)
Public Property FlexLicenses() As List(Of FlexLicense)
[code] .....
In the code above I have the FlexServer class which refers has two lists as properties, one for FlexLicense and one for Modules. The FlexLicense class has a property to refer back to the FlexServer class that "owns" it. In order to update this property in code, I have to add the FlexLicense to the FlexServer.FlexLicenses list AND set the FlexLicense.FlexServer property. What I am looking for is, is there a way (in the property definition or wherever) to both add the item to the list and alter it at the same time?
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Jul 2, 2009
I am developing a custom control with VB9, and I want to add a Property Name TextFileName this property need to use OpenFileDialog, which type I can use when I define this property?
for example another property I use is EnterFocusColor and its type is System.Drawing.Color so when the user select the property it opens the ColorSelectionDialog Hany M. El Tarhony
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Jun 21, 2010
I have created a CustonControl (NOT a usercontrol) and defined a DependencyProperty as following
[code]...
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