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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Aug 10, 2010
Can partial classes be used for web-services or there is some other way to implement it ?
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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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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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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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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.
[Code]....
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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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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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.
[Code]...
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Jan 17, 2010
My boss has given me an asp.net web application that was done by his former employee. Now my boss has no contact with that employee. He wants me to make some changes in that web application. I went through the application. There is no documentation present for that application . Its a huge application. It contains many directories. I think it was a team work. It has many asp pages, aspx pages, jsp pages, xml pages, css pages, etc... How to understand other person or team's website or web application that was written in asp or asp.net and vb or vb.net?
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Jun 19, 2009
I have heard of setting server specs to have HTML pages parsed as PHP pages by changing the .htaccess or httpd.conf files. Is there a similar solution to have HTML pages parsed as ASPX pages?
A website I am working on does not want their PageRank to lower since their HTML pages are already indexed and used on other websites but wants to use some dynamic features of aspx pages (like include the navigation file so that changes to the nav will only have to be done in that one file).
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Jul 27, 2010
I'm using Telerik RadControls, in my codebehind I have the following function, a portion of which adds buttons to the footer.
[Code]...
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Apr 21, 2011
I have extended an Entity Framework 4 entity class with a calculated property in a partial class. This member is not available on the client to which the entities are exposed via WCF RIA Services.when using C# appears to be changing the extension of the partial class file from .cs to .shared.cs. I tried this with my VB.Net solution (.vb to .shared.vb) and got a long list of errors. I believe what happened is that the partial class lost its association with the entity on the client - it inherited from object rather than EntityObject.
My best guess is that this is related to the way that VB.Net handles namespaces.Each project has a 'Root Namespace' which is prepended to anything that is defined within a code file. C# has a 'Default Namespace'which is the namespace into which new types are placed by default - via a namespace statement within the file.The partial class is probably having the client namespace prepended to it which puts it into a different namespace than the entity with which it is associated on the server.Is there any means of extending an entity in such a way that those extensions are available on the client via WCF RIA Services and VB.Net?
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Mar 2, 2010
I am a beginner of VB, I want to set up a timer to count the time when a programme is runing, but the programme has several pages.How can I make a continuous timer to count the time even though jump to another page?
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Sep 2, 2009
How the creater of this make images in the tab pages captions?
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Jun 1, 2011
I am using report.rdlc components in my application. I have one report where I have a tablix table embedded in a tablix list. The top of the list above the table contains all the group variables, eg customer name, customer address; the table contains the details, eg order details. I need to display the customer information again when there are too many order details to display on one page and I also need to display the order detail column headings again on the new page. So far I have played around with the Tablix properties and the Static row properties but no matter what I have tried I cannot get the headings to repeat.
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Dec 20, 2011
I am using Stanav's PdfManipulation2.AddImageToPage(..., Pages) for iTextSharp library (v5.1.3) and was not able to add the image to specific pages: e.g. to add to only page 1 and 3 of a five pages PDF
Dim Pages() As Integer
Pages = New Integer() {1, 3}
PdfManipulation2.AddImageToPage(..., Pages)
Calling AddImageToPage() with the the optional Pages parameter will add the image to all pages though.
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Mar 29, 2010
Is there an Equivalent for the following code in VB2008?
VB6:
Load frmAlarm ' Loads the form
frmAlarm.EditAlarm oAlarm ' Loads what was saved on that form
[code]....
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Jul 22, 2010
I've often wondered why would you need to make your own classes in vb.net? What purpose can they serve a typical application that cannot be already down without creating them?
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Mar 19, 2009
I have a form on a .NET webserver using aspx pages with the vb code-behind pages. The form collects the entered data and then emails it, that part works fine.Right after it gets emailed, this code checks to see if the email was sent or not and then updates the landing page accordingly. I used to use just an IF THEN statement, but now that doesn't work in these new .NET pages. Here's the end of the code that I am having difficulties with:
[Code]...
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Apr 16, 2012
So i learned about classes today and i am totally confused about them. How exactly do they make programming life eaiser? I though Functions and Sub Procedures were making my programming life easier
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May 25, 2010
I'm trying to create a base interface for a class of mine that uses generics. However, I cannot figure out how to declare a property of the interface when its type won't be defined until the class is initialized.
To clarify, consider List(of T), which according to msdn, implements IList (among other things). Note that IList is not the same as its generic counterpart IList(Of T). So that mean any List(of T) can be converted to IList, which simply returns an object for its items. That's what I want to do with MyClass(of T), be able to cast it as IMyClass regardless of what T is.
But when I try such as:
Interface IMyClass
Prop A as Object
Class MyClass(of T) Implements IMyClass
Prop A as T Implements IMyClass.A
I get a signature error for the last line, even though object is broader than T. What am I doing wrong, or how exactly did Microsoft manage to make List(of T) implement IList?
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May 18, 2010
This probably sounds daft, but im struggling to get to grips with Classes/Modules/arrays and objects, as well as there uses and what they are, and yes im still coding some how i hear you cry.The reason i ask is because Ive got a load of Dim's in my program that are the same giving locations of files and folders and wondered can they be used as a module that i can alter after the program is built, incase of folder locations being wrong or moved, manually correct after install.
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May 27, 2010
I am working on a bitmap class module in Visual Basic 2010 that has an option to create a graphic grid on the bitmap.
[code]...
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Mar 20, 2012
I was just wondering how you can make classes import into your main Form.vb
Let's say I make a class with the following.
Public Class OtherStuff
Public Sub HideMe()
Form1.Hide()
[Code]....
How could I make the Form1.vb include the things that are in OtherStuff.vb.
All of the solutions that I have tried come up with the same error. Reference to a non-shared member requires an object reference.
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Oct 22, 2010
I have written multiple programs in the past that deal with cad data. Points, lines, arcs, etc. For each program I ended up creating slightly different versions of some really base classes like a class that defines a point:
<Serializable()> Public Class Point
Public x As Double = 0
Public y As Double = 0
Public z As Double = 0
End Class
My question is how would I use that class in such a way that it could be in a namespace and imported into any future project that I write?
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Jan 23, 2012
I have two classes, one nested in the other. [code]Neither "Name" or "ID" are unique between operations and records.I wish to construct a dictionary using LINQ = Dictionary(Of String, Of List(Of Integer), whereby the keys are uniqe examples of Names in my collection and the values are the collective set of distinct IDs that are associated with those names.
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Jun 13, 2012
How can I structure my classes so that the user interfaces though a single class while the supporting classes are hidden from their view? I think its best understood in an example:
Public Class MyInterface
Public Economic as EconomicClass
Public Sub New()
MyBase.New()
[code].....
So you might ask why am I even separating them? It's strictly for others who will be working with this interface. I need to funnel them though a logical structure:
interface.Economic.MyMethod
interface.Currency.MyMethod
etc
This way everything is already handled for them in the background and they only need to run the method they need. I don't know if I can have it both ways in VB.NET.
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Oct 24, 2009
Here is some example code of what I mean:
vb
Public Class Form1
Private Sub Button1_Click(ByVal sender as Object, e as systemEventArgs) Handles Button1.Click
[Code]....
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Jul 10, 2009
I m trying to raise Click event of Textbox explictly but I m getting "Derived classes cannot raise base classes" error.[code]....
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Jul 13, 2011
i have this program which records the every printing made on a local computer.I am to record the number of pages of the document to be printed and the number of printed pages. i have this code but i don't know the number of pages and number printed pages always return 0 [Code].
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