Partial Classes - Add A Control Or Change A Property At Design-time

Mar 26, 2008

In my never ending search for more knowledge, I have come across Partial Classes. I was wondering if some of the kind people who actually understand the uses could explain some of them to me. Now I know that when we create a form that we actually create a partial class which the generator rewrites when we add a control or change a property at design-time, and this allows us not to have to worry about setting up the controls ourselves.

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Change The Order Of Property Serialization At Design Time In .Net?

Oct 21, 2009

I have a class where it's problematic to relay on the properties being serialized in alphabetical order at design time.In other words, property Z must be serialized before property A.The problem arises because property property Z clears property A whenever it changes - which happens in InitializeComponent.I work around this problem by setting a FirstTime flag, but that seems messy.

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Collection Type Property Assignable At Design Time In User Control

Mar 8, 2012

I am creating a User Control where I have a property called Items. Items is of type LibraryPanelBarItem Collection (custom class) which contains a collection of LibraryPanelBarItem objects. I would like to be able to add these at design time by using the Collection editor that VS uses for adding things such as treenodes/listviewitems. Ideally I would also be able to declaratively add them to the html syntax. I can get the Items property to show up but I get no intellisense to add the items between the opening and closing tags. [Code]

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Why Does The Text Property Overridden In User Control Is Not Showing At Design Time

May 20, 2010

I have a usercontrol which overrides the property Text. But this property is not shown at design time.If I rename it to caption or value it is shown in properties at design time but Text is not shown.

public Class SomeControl
Inherits System.Windows.Forms.UserControl
Public Overrides Property Text() As String

[code].....

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Change Property Value When I Change Name Property Of Control In Desgin Time?

Mar 10, 2010

I inherits textbox Control and I added some new properties to it .one of these properties value i want it to change it's value in desgin time when i change Name property of the new textbox

Public Class NewTextBox
Inherits TextBox
Private _txtSubName As String = String.Empty

That is the property for set or get SubstringName of Textbox

Public Property SubName() As String
Get
Return _txtSubName[code].....

that's the property i want to change it's value when i change Name property of the control.i tried to overrides Name property but it's not overridable also i trieds to overloads it but it doesn't work in desgin time.Here is something i tried but it's wronge.

Private _txtName As String = ""
Public Overloads Property Name() As String
Get[code]......

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.net - How To Show A Form's Custom Property At Design Time

Oct 22, 2010

I have a form where I have created a custom property, DataEntryRole, and set its Browsable attribute to True, as shown:

<Browsable(True)> _
Public Property DataEntryRole() As UserRole.PossibleRoles
Get
Return mDataEntryRole
End Get

[Code]...

When I view the designer for my form, DataEntryRole doesn't appear in the property box. I assume that it should appear if I were to create another form that inherited from this base form, but that's not what I want. I want this property to show up in my current form.

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Public Property With Percentage Symbol At Design Time

Mar 18, 2011

A component I'm making has a public property that represents a percentage. How I can give it a % symbol in the Properties Window at design time in Visual Studio? I mean, like the Opacity property of a Windows Form.

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C# - Refresh Property Grid, At Design-time, When A Readonly Collection Changes In .Net, Winforms?

Mar 3, 2010

I have a class that has a readonly collection property - Its a list of extender providers that have been applied to the control.I've implemented a simple property descriptor for the collection so that the property can be expanded in the property grid to examine each entry.

When I select an extender provider and set it to false, I remove it from the collection. The GetProperties method of the type converter is requeried and the property grid refreshes.However, when I set an extender provider to true, and thus add it to the collection, GetProperties is not requeried.

Somehow, the property grid is making a distinction between adding to and removing from the collection. Or alternativly, its refreshing when an extender provider is added, but not when one is removed.

[Code]...

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Persisting A Collection, That References An Internal Property, At Design Time In Winforms, .net?

Mar 11, 2010

(I've answered the question below with a hack. I'm fairly confident in it unless MS change the way that codedom serializers the designer code.)ETA2:I've worked out what is going on. I wondered why sometimes it would work and not others. It boils down to the name that I give to the internal property and the collection.If I rename the property 'Annoyance' to 'WTF', it will serialize correctly because 'WTF' is, alphabetically, after the name of the collection - 'InternalAnger'.It looks like the serializer is creating instances of objects alphabetically and needs my internal property to be created by the time it comes to create the collection.I can fix this with a rename, but that's a hack and I fear that writing a custom serializer is a big job - which I've never done before.ETA: Jesus, I'm sick of this. This problem was specifically about persisting an interface collection but now on further testing it doesn't work for a normal collection. Here's some even simpler code:

Public Class Anger
End Class
Public Class MyButton

[code].....

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Forms :: Design Time Control Behaviour On Tab Control?

Feb 9, 2011

i have a splitter control on tab 2, a grid and a scheduler control on tab 3..looks fine...i save it....close the form...reopen the form, and the controls are all resized and moved around on me....and not for the better.

wierd thing is that when i run the app, the controls are placed properly, but design time is totally f&*ked up.I know this one isn't me. is it the tab control? should i just do toggle buttons at the top and show/hide my own panels? this is just too freaky to deal with. is there an easy work around for this?

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Change Properties Of Inherited Controls At Design Time?

Mar 23, 2009

I am using visual inheritance and was wondering if there is a way to change the properties of inherited controls at design time, preferably in the form designer. If not, then in the designer code. I have my control declared as Public in the base class. I can access it in the child form code, but not in the form designer. Is this just not possible?

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C# - Can Partial Classes Be Used For Web-services

Aug 10, 2010

Can partial classes be used for web-services or there is some other way to implement it ?

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C# - Serializable Partial Classes?

May 29, 2009

I have the follow VB.NET class definition:<Serializable()> Partial Public Class Customers End Class

Inside another file I have the same thing (with different methods and variables of course). When I compile, I get the following error:Attribute 'SerializableAttribute' cannot be applied multiple times.The error is pretty self explanatory. My question is though, if I just mark the one class as Serializable(), can I assume the entire class with be marked as serializable()? In other words, Do I only need the serializable() tag in 1 spot in the class?

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.net - Additional Partial Classes For A Form?

Sep 3, 2010

We have a big Form class that we like to split into peaces using partial class approach That could be done by manually modifying a project file, and adding MainFormPN.vb entry

<Compile Include="MainForm.vb">
<SubType>Form</SubType>
</Compile>
<Compile Include="MainForm.Designer.vb">

[code]....

The issue with this approach is when double click on this item in VS2008 IDE it shows new empty form, not MainForm UI. It looks like VS2008 does not support multiple partial classes for a Forms.

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Asp.net - Accessing Values From Partial Classes?

Sep 2, 2011

I'm still learning so this might be completely wrong. I have built a multi-user web application for internal purposes. I have split my code up to make it more manageable and have run into some problems. I suspect that I have done something very silly!

I have a class in a separate file (quoteStatus.vb) in App_Code here it is:

Imports Microsoft.VisualBasic
Imports System.Data.SqlClient
Imports System.Data
Public Class quoteStatusHelper

[Code]...

This seems really wrong, as the value seems to be held in the partial class after the first run. So if I have two users accessing the class the public shared dim is changed for both users! There must be a better way to do this. I have looked everywhere and I'm more confused now than when I started off..How can I make QuoteStatus in the partial class unique to every user and access it from my code.

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Debug Control At Design Time

May 26, 2011

I have a problem. I have created a control, Now whenever I am going to Drug that control on my form then a error popup will appear that says "Failed to create component 'XXXXXXXXX'." System.IO.FileLoadException: A strongly named assembly required. HRESULT: 0x80131044 Is there any facility available in .NET for design time debugging Means If I drug a control on form then I will allow me to debug the control.

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Set Parent Control In Design Time?

Jun 11, 2012

I created a custom control (inherited from a panel). Then I created some other custom control (textboxes)

I add the panel control to the form, then I add some custom textboxes inside the panel.

Now, if I remove the panel, the custom textboxes don't move. I think, because the custom panel control isn't the parent control of the custom textboxes.

How can I modify my custom textbox class, if I add the textbox to a form, to a panel, to a container, it should have that container as parent.

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.net - Access Shared Members In Partial Classes

Feb 16, 2011

I'm writing a WCF-Service and I split up my service class to multiple partial class files, so every ServiceContract-Implementation gets its own file. I have one file however that should contain e.g. members that are used by every partial class file such as a logger. The service is hosted with IIS 7 if this matters in any way.

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The code compiles fine, but at runtime I get an BC30451: The name m_Log is not declared Error (Don't know the exact words for it. I get a german message ;) ). I don't think it has something to do with the type of m_Log or a depending assembly because I get the same error if i try this with a String. What am I doing wrong? How can I make this work? Edit: I was trying the same thing in a simple console application without any problems. :(

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Add A Design-time Attribute To A Custom Control?

Jul 29, 2009

setting the default value for an integer attribute of a custom control seems to have stopped working. The following code adds the Maximum attribute to the design-time properties table, but the default value pops up as 0, not 99:

<System.ComponentModel.Browsable(True)> _
<System.ComponentModel.Category("Behavior")> _
<System.ComponentModel.Description("highest value possible")> _

[Code].....

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Setting Control Parent At Design Time?

May 18, 2012

I am using Visual Basic 2010 for a project.My project requires to place a TRANSPARENT button on top of an image (placed inside a picturebox). for that to work, i need to set the button's parent to the picturebox. Is there a way to do that in design time? I cannot find anything on the property tab. The reason i want to set it on design time is because my project will have a motherload of buttons and it will a pain to code the parent change....

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User Control Design Time Collection?

Apr 30, 2011

This is a related to my last post, but not enough to make sense as a tag on question.I have a collection(of myClass) that is exposed as a public property in a user control.When I add an item to the collection in code I would make the call collection.add(new myClass) and of course the constructor for myClass is called.When I add items to the collection via the design time menu the constructor for myClass is not called.... of it it is called, I can't see any evidence of it.

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User Control Design Time Error

Apr 29, 2011

I'm trying to make a simple User control that houses one collection of a class that I've made. After building the control All works as planned and then randomly when I try to go to the design time interface for the form I placed the control on I get an error page with the following:

To Prevent Possible data loss before loading the designer, the following errors must be resolved:(ignore and continue: which about half the time works and the control shows up and the other part of the time all of the controls on the page are missing)

The one error is the following:Object of type'System.Collections.Generic.List'1[StaticGraphPlot.clsStaticCurveData]' cannot be converted to type System.Collections.Generic.List'1[StaticGraphPlot.clsStaticCurveData]'.

[Code]...

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Using Partial Classes To Make Two Equivalent Codebehind Pages In VB

Jun 15, 2012

We are using T4 to generate our .aspx and .vb files. Everything works well - but we often have to customize behavior on the pages. However, we also occasionally have to regenerate pages - which has the potential to wipe out work which would otherwise still be valid. I would like a setup like this:

Default.aspx 'which would contain the controls
Default.aspx.vb 'which would bind, load and save data
Default.behaviour.vb '(or something like that) - which would store the behavior

With both the pages being able to reference the controls. Is that at all possible? [Code]

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Why Does Changing Solution Platforms Stop Partial Classes From Being Seen

Nov 18, 2010

There is an older version of the software which works fine on all of our deployment platforms, but the version I am trying to push out is working fine on 32-bit desktop installations, but is crashing-and-burning when it attempts to access Crystal Reports and Informix installed DLLs on a 64-bit machine, running terminal server sessions (yeah, I know, could I change anything more about the deployment platform?)One of the suggested avenues of investigation was changing the solution platform from "Any CPU" to x86.On attempting to do this, Visual Studio seems to stop being able to connect the partial classes constructed by XAML objects, with objects declaring that they have no "InitializeComponent" methods, and then failing on down the line until I reach the maximum number of errors.

Oddly, changing the solution platform, and then rebuilding in Expression Blend compiles just fine. Changing the platform back to AnyCPU makes the problem disappear. All projects have compile and debug configurations set to Active. I can't see any reason why simply changing the targeted platform would stop the XAML from generating partial classes Okay, it seems to be that there are some external DLLs to the project, and that those are the cause of what I'd call the first-level compilation failure, as they don't seem to contain any classes once the target platform has switched.In VS2008, this causes the cascading failure of absolutely nothing working at all, as described above, but at one point I somehow managed to import the project to VS2010 with only those errors in place (missing classes, etc.), without the rest of the project imploding.I'm now working on reconstructing those classes from those DLLs, and hopefully will be able to get together a project that will compile on multiple target platforms by the end of the day.

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Adding Items To A User Control Add Design Time?

Dec 4, 2009

I have created a user control that mimics what a label does. I realize I could have inherited the label control, but I am working on understanding the process. I wish to add items to the control. normally (in the code of my project) would do:

Form1.Label1.Controls.Add(mylabel)
After creating mylabel in the code of course.

[code]....

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C# :: Collection Editor Within A User Control At Design Time?

Jun 8, 2009

I have a UserControl class in a Windows Application project. One of the properties of it is a collection of another class that I have defined. I can't seem to find a good example of how to get the standard collection editor working for it at design time.I got it working using some example code I found to a degree, but the data in my collection doesn't get saved. When I exit the form and open it back up in design time the data isn't there any more.Here is my class:

Public Class Gauge
Inherits Control
Private WithEvents _Captions As New CaptionCollection

[code].....

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VS 2008 Make Control Freeze Like Design Time?

Jun 12, 2009

Can we make the Combo Box not drop down if we click on it even though it have item in the list, button not click-able even though it have the on_click event..textbox not allow to set focus but not in disable mode...everything like design time.. because I want to do drag and drop control like visual studio.. but I can drag now, just when I want to click the control to drag, the control still remain the default function...

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VS 2008 Prevent Re-size Of A Control At Design Time?

Sep 26, 2011

How can i do this ... by the propper way i mean so that the grippers don't even display - like they do with an auto-sized label, or a non-multiline textbox.

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Display Text String In User Control At Design Time?

Feb 25, 2009

I am creating a user control that contains a panel as well as 4 string and integer properties. I would like to display the text of the properties in the user control during design time.

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Implementing A Custom Control With A Typed Collection For Use At Design Time

Oct 14, 2010

I am having a problem with the Visual Basic property collection editor .

I have created a Custom Type

Public Class Field
Private Item As Integer
Private Name As String = "FieldName"

[ode]....

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