I have created a UserControl Popup window and called that xaml file into another file. Imported the namespace.When I am trying to build this project an error at this below given code:
<Popup x:Name="POP" IsOpen="False" PlacementTarget="{Binding}" Placement="Center" AllowsTransparency="True">
<a:PopUpWindow x:Name="pp" />
</Popup>
Error at
<a:PopUpWindow x:Name="pp" />
Could not create an instance of type 'PopUpWindow'.
I've searched for an answer and found some c#-examples, but could not get this running in vb.net:
I thought of something like the following[code]...
I know, I can create a new instance with the Activator.Create... methods, but how to create an array of this type or just declare a new variable?
D is a dictionary whose entry values are of Type T..What I'm attempting to do is have a delegate like "Serializer" below that I can invoke on an instance of T, such as "Entry.Value" below.Please see the "return Entry..." line below for my wishful thinking.[code]
View 2 RepliesI'm compiling a VB.Net 2.0 app (created in VS2008) using msbuild, and now I've added a generic return type, it's giving me the following:
Warning: Type library exporter encountered a generic type instance in a signature. Generic code may not be exported to COM.
Having just spent ages removing all of the previous warnings, I don't really want to add a new one. Any idea how to get rid of it (aside from not using generics)?I don't know what details I'd put in the attribute, or what number to put in the project-level ignore list.
I want to create a class is it where I can do...
[code]...
How do I do this? Do i create a class and create a instance of CarData? but how do I add Color and Year etc to it?
any one knows how to set an excel object to instance type.
View 2 RepliesI have two class like this[code]...
The red code does not works. How do I get the type of data to declare, for example, a Specific Instance(Of integer) if Data is integer, and also Specific (of SomeClass) if Data is SomeClass?
I have a class C(Of T). I want to determine if some given value has type C, regardless of what T is. For example, I might want to determine if a value is a strongly-typed list, regardless what type of items the list stores. I just need to know how to do it in VB.net. In Java the syntax is like this:
var result = obj instance of Gen2<?>;
Why does this extension:
[code...]
Work for instance of type List(of Object) but not for instance of type List(Of List(Of Object).
Object is the most generic type in .net so List(of Object) is an Object and the extension shoud work?
there is a way to turn the following code into a sub so I don't have the same boilerplate show form code in use a thousand times in a program:
Example:
Public InstanceOfFrmGeneric As frmGeneric
If InstanceOfFrmGeneric Is Nothing Then
InstanceOfFrmGeneric = New frmGeneric()
[code]....
I'm tyring to pass a variable data type to a template class. Something like this:
frmExample = New LookupForm(Of Models.MyClass) 'Works fine
Dim SelectedType As Type = InstanceOfMyClass.GetType() 'Works fine
frmExample = New LookupForm(Of SelectedType) 'Ba-bow!
frmExample = New LookupForm(Of InstanceOfMyClass.GetType()) 'Ba-bow!
[Code].....
I'm assuming it's something to do with the template being processed at compile time but even if I'm off the mark there, it wouldn't solve my problem anyway. I can't find any relevant information on using Reflection to instance template classes either.
(How) can I create an instance of a dynamically typed repository at runtime?
After debugging a particularly tricky issue in VB.NET involving the order in which instance variables are initialized, I discovered that there is a breaking discrepancy between the behavior that I expected from C# and the actual behavior in VB.NET.Nota bene: This question concerns a slight discrepancy in the behaviors of VB.NET and C#. If you're a language bigot that is unable to provide an answer other than "that's why you should use C#, noob", there is nothing for you to see here; kindly move along.Specifically, I expected the behavior outlined by the C# Language Specification (emphasis added):
When an instance constructor has no constructor initializer, or it has a constructor initializer of the form base(...), that constructor implicitly performs the initializations specified by the variable-initializers of the instance fields declared in its class. This corresponds to a sequence of assignments that are executed immediately upon entry to the constructor and before the implicit invocation of the direct base class constructor. The variable initializers are executed in the textual order in which they appear in the class declaration.
Contrast that with the portion of the VB.NET Language Specification concerning Instance Constructors, which says (emphasis added): When a constructor's first statement is of the form MyBase.New(...), the constructor implicitly performs the initializations specified by the variable initializers of the instance variables declared in the type. This corresponds to a sequence of assignments that are executed immediately after invoking the direct base type constructor. Such ordering ensures that all base instance variables are initialized by their variable initializers before any statements that have access to the instance are executed.
The discrepancy here is immediately obvious. C# initializes class-level variables before calling the base constructor. VB.NET does exactly the reverse, apparently preferring to call the base constructor before setting the values of instance fields.If you want to see some code, this related question provides a more concrete example of the divergent behavior. Unfortunately, it does not provide any hints as to how one might coerce VB.NET into following the model established by C#.
I'm less interested in why the designers of the two languages chose such divergent approaches than I am in possible workarounds for the problem. Ultimately, my question is as follows: Is there any way that I can write or structure my code in VB.NET to force instance variables to be initialized before the base type's constructor is called, as is the standard behavior in C#?
I am using MEF for Plug-in, I made one class PluginManager which has propety<ImportMany()>Public Property Plugins() As Lazy(Of IPlugin, IPluginExport)() Now want to create a new instance of when i query from plugins, I have already set PartCreationpolicy as Nonshared, but still its not working.
View 1 RepliesI am working on an ASP.Net 3.5 solution that I did not originally build. I added a class file named Incident.vb to the App_Code folder like I always do.But in my code behind of a web page, I usually create an instance of a class like:
Dim oIncident as New Incident
But after I type "New", normally I would see my class file he intellisense but I do not. So it does not seem to be able to find Incident.vb. I have not seen this behavior before. Trust me, my class is correct. I have created many class files like this.[code]...
Is it possible to create other instances of an existing control and put them into an array?
View 5 RepliesI have a for next loop looping through a dataset.I want to create an instantce of a class for each row.How can I create another instance/variable for each row?
View 5 RepliesDo I have to instantiate description every time for different method? Or should I use static? Here's how I'm doing this now: What is the best way of handling this kind of situations. it seems that I repeat this line:Dim description As BLLDescription = New BLLDescription() without any good reasn.
Protected Sub Button8_Click(sender As Object, e As System.EventArgs) Handles Button8.Click
Dim description As BLLDescription = New BLLDescription()
[Cdoe].....
I am trying to compile the following code and i am getting the error[code]...
View 2 RepliesI am trying to create an instance of a control to copy it.
Dim NewPanel As New Panel1
Is not working. When you create an instance like this, the "Panel1" wont show up in the list of classes, so it says "Panel1 is not defined".I have heard of control arrays dissappeared in VB2008,but still,is there any way to create a new instance / copy an already existing control or let a control appear like it was when you made it in VB so you can open multiple Panels like they are child forms?
EDIT: I know you can do:
Dim newPanel As New Panel
newPanel = Panel1
Form1.Controls.Add(newPanel)
..but that's not what I want, because that makes you can't edit the controls inside the new panel.
if i create an instance of an object/webpage, is that a complete new object/page based on the original or does it does it just make it accessible? i am almost sure that it creates a new object/page but i would like confirmation. in other words what is the result of this code?
dim Page2 as new Page1
dim Page3 as new Page1
would this create 2 new pages that i can "customize" separately and add different controls to each? heres a brief description of what i want to happen:the user will be viewing Page1 and when he clicks btnCreate i want a page that i created in the designer to be shown and its name and other variables to be determined by what the user chose for room options in Page1. i need "new versions" of this page to be created because multiple users will be creating multiple rooms. i understand that there are more lines of code involved in creating pages and i do have more questions regarding those but i will wait until i confirm that dim Page2 as new Page1 will create a new page. like i said im sure that this does create a new page but i need confirmation. also if it does create a new page, how do i get it to show. i know that response.redirect will redirect me to a dif page but i want show this new room on top of the old one.
i need to programmatic ally create new instance of sql server in vb.net.i develop the database management project. i need new instance at windows authentication.
View 1 RepliesI'm working through a book that does not provide a lot of example code and what it does provide is in C#. The book refs vs 2005 but I'm using vs2008. The author asks for the user to create a solution with two projects, one winforms and the other a class library (called DependentAssm). The class library is added as a reference to the winforms project In the class library, he asks one to create a new class called SayHelloComp. The project created a file called class1.vb, and a class called class1 which I renamed to SayHelloComp. I left the file name alone, that's ok right?
View 4 RepliesSo I get thrown an exception right when I try to create a new instance of my Web Service that says:
"Could not find default endpoint element that references contract 'KBBVehicleService.IVehicleInformationService' in the ServiceModel client configuration section. This might be because no configuration file was found for your application, or because no endpoint element matching this contract could be found in the client element."
This is a web service that will connect to Kelley Blue Book. I know I need a new endpoint entry in my Web.Config, but what does this look like? The one I added looks like this:
<endpoint address="http://localhost:3300/KBB.svc" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_Default" contract="Services.Client.IVehicleInformationService"/>
But it doesn't work. Still throws the same exception at the same place.
I keep having error message at
ArrayGroup(count).dateDate = valueListString(0),
Code:
Structure dataAttribute
Dim dateDate As Date
Dim timeString As String
Dim volString As String
Dim openString As String
[Code] .....
when i compile my code i got "use the new keyword to create an object instance" at this line " accounts1(sd).Name = textBoxUser.Text"
My code is below.
Private Sub buttonSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles buttonSave.Click
If comboBoxAccounts.SelectedIndex >= 0 Then
[Code]....
Private Sub textadd(ByVal sender as Object, ByVal e as System.Windows.Controls.TextChangedEventArgs)
txtfirstname.Text = txtdisplayname.Text
'TODO: Add event handler implementation here.
End Sub
is it possible to use a dll in my project without having to create an instance of the dll? for example I have a dll that has three basic math functions:
[Code]...
I understand if i was to create my own class i would need to declare a variable with the new keyword to create an object to access the encapsulated methods properties etc, unless they were declared shared.
dim myVar as myClass = new myClass
But in this next example is where i have become confused. i have added the mschart control to the form and used the hittest function with the following code.
Dim myVar as hittestresult
myvar = me.chart1.hittest(e.x,e.y)
Why wasn't it necessary to create a new instance of the class 1st. Does the hittest function return an object or a reference pointer to the object. To clarify what's the protocol for when & when not to create a new instance of the class in use.
I have an application that reads another processes memory.I initially had multiple scanning threads for the various areas I needed to read.This was processor intensive so I decided to go with the observer pattern.All was well except that I am having a weird behavior.Here is what is happening.I have 2 radars (overlay and mapped)Both have a watcher class that attaches to the memory scanner and is notified on a new list of mobs.so I open radar 1 (mapped) it attaches it's watcher to the scanner and waits for mob list update notifications
Open radar 2 (overlay). same thing happens and another watcher is attached.all is well and good so far.Now there are properies on the mobs in the list, one of which is IsFilteredOut.This property is set in the radar code after it receives the list. Now the weird behavior is that no matter what I do, the second radar to be opened changes all the properties of the mobs in the list of both radars.It is as if I am passing the list by ref, but I am not.I actually create a new instance of the moblist class every time I pass the list.Here is the notify code. As you can see I create a new instance of the moblist class each pass.
Private Sub NotifyMobListUpdated(ByVal Mobs As List(Of MobData))
If Mobs IsNot Nothing Then
For Each w As Watcher In _watchers[code].....
I do not want a Windows Media Player control on my form. I am making an alarm clock. I have tried this: <code>Friend WithEvents WindowsMediaPlayer As New Microsoft.Win32.</code>
But I do not see a Windows Media Player member.
I also asked on StackOverflow.