There are two ways to create methods on the fly. Through Anonymous method and through Lambda expression (relevant for C# language as far as i know). Though there is not much difference between them. How to create Anonymous methods in VB.NET ?
View 1 RepliesI have the following in C#: public static void StartAnimation(UIElement animatableElement, DependencyProperty dependencyProperty, double toValue, double animationDurationSeconds, EventHandler completedEvent)
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I'm trying to create an extension method that returns an IEqualityComparer based on a lambda function. Heres the extension method:
<Extension()>
Public Function Comparer(Of T)(Func As Func(Of T, T, Boolean)) As IEqualityComparer(Of T)
Return New GenericComparer(Of T)(Func)
End Function
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Calling method in anonymous object?This works:
Call (New MyForm).Show
How would you convert this to VB (using .NET 4.0 / VS2010) ?
bw.DoWork += (o, args) =>
{
Code Here
};
I thought maybe like this:
AddHandler bw.DoWork,
Function(o, args)[code]....
But it says Function does not return a value on all code paths.
With C# anonymous delegates, we can avoid declaration of extra method, I know in VB.NET they're not available, but is there a design pattern that I can use so that I can avoid writing an extra method each time? I need it for SPSecurity.RunWithElevatedPrivileges which will be used a lot of times in our code.
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Imports System.Reflection
Public Class Test
Private Field As String
End Class
Module Module1
Sub Main()
Dim field = GetType(Test).GetField("Field", Reflection.BindingFlags.NonPublic Or Reflection.BindingFlags.Instance)
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(using VB 08!) In order to avoid "magic strings", I have used this handy method (not my own!) many times to get a property's name as a string:
Function GetPropertyName(Of T, R)(ByVal expression As
Linq.Expressions.Expression(Of Func(Of T, R))) As
String
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I found that this answer was asked and answered before VS2010 was actually released.[code]to a .NET Framework 4.0 project in Visual Studio 2010 and it does not compile.Do you now if this feature is really implemented and what I am doing wrong?
View 3 RepliesI am trying to create a new thread using an anonymous function but I keep getting errors. Here is my code:
New Thread(Function()
// Do something here
End Function).Start
Here are the errors I get:
New - Syntax Error
End Function - 'End Function' must be preceded by a matching 'Function'.
I have a large problem with inheritance in vb.net. The problem is the following:
I have 2 forms => frmBase and frmChild
In frmBase i want to create a method Called StartWorking() and i want frmChild to inherit this method.
But here is the tricky thing: when frmChild.StartWorking is called i would like the following => without calling MyBase.StartWorking()
I want frmBase.StartWorking() to be executed first and after a test in frmBase.StartWorking if blnValue is true then frmChild.StartWorking has to be activated. if blnValue is false that frmChild.StartWorking cannot be activated.
I'm a Linq noobie, maybe someone can point me in the right direction. What's wrong here? These anonymous types seem to have the same signatures.
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Consider a MyForm class that contains a shadowed implementation of Show(). It also contains a CreateForm() method, which accepts an instance of the form and calls the shadowed sub:
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I've got this code here, hard coded into a button. What I want to do is create a module with a method, let's call it "openFile."
That way, in the future, I can just call openFile("default directory",file type, etc etc) and also being able to set the input from the reader as the text in a text box or something all in one line of code. Is this possible? I don't know anything about writing modules or my own methods/API or anything like that...Can someone point me to a tutorial about this?
Here's the
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim filesOpen As New OpenFileDialog()
filesOpen.InitialDirectory = ("C:") 'set the default directory
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i have a multi language website and i get the data from xml file now to make the code easier to use and if in future i add some more data to xmlfile i need to create something that be look like this:
Languages.Account.UserName() return a string "User name: "language.Video.NotFundError() return as string "Sorry, your requested video is not fund."
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I am really trying to follow the DRY principle. I have a sub that looks like this?
Private Sub DoSupplyModel
OutputLine("ITEM SUMMARIES")
Dim ItemSumms As New SupplyModel.ItemSummaries(_currentSupplyModel, _excelRows)
ItemSumms.FillRows()
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I'm trying to change/execute the example [URL]...onContext.aspx I've posted my project below. I'm getting a cross-threading error and I thought the point of all of this was to avoid that. (yes I realize I could just delegate... I'm trying to do something more complicated but am using this as a test bed)
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I'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 RepliesI like to create an extension method to Image.FromStream Public Shared Function FromStream(ByVal stream As System.IO.Stream) As System.Drawing.Image
With possibility to cancel processing like Public Shared Function FromStream(ByVal stream As System.IO.Stream, ByVal CloseTask As ManualResetEvent) As System.Drawing.Image
For the last week I've been trying to create an async method. I tried the MSDN article How to: Implement a Component That Supports the Event-based Asynchronous Pattern but it does the work in a method in the same class. The work I'm doing is a lot more complicated and is its own class. The problem I'm having is the class doing the work cannot post the progress or completion as the methods that handle this stuff is in the parent class.
View 2 Replies(New clsViewIllus).View(MyIBaseView, enumViewSolveTypes.View, Me, , True)
... in VB? Basically too lazy to do this:
Dim vi As New clsViewIllus
vi.View(MyIBaseView, enumViewSolveTypes.View, Me, , True)
I want to create some reusable code in my forms.The idea is that a class is growing when more subroutines are added so, I need to store the finished subs somewhere to make place for others, this way I don't lose myself searching through the entire class
View 4 Repliesi need to create a hash table using a multiplication method and i need to create an array of linked listso how i can to create array of linkedlist in vb or c# ?
View 1 RepliesIs there a way to create a method with unknown number of parameters? And if it this the case: How is it possible to get access to them within this method? Do they have to be from the same type?
View 1 Replieshow to create a save to text file method with a try catch in the method in a class and then call this save method from a button on a window form. I am currently doing the save method under the button directly but to tell you the truth i would prefer to just do it one time and call it from different locations in the various forms i have, then copying it all the time.
View 1 RepliesI want to know how to create our own file, such as: (.Docx). If we opened the file in notepad the characters contained in the that's file could not understand, so i would like to know by what method of making the it's file? Is the file created and use encryption method or what?
View 7 RepliesI am creating some Jpegs on the fly using the copy method within Office products. Effectively I am taking a snapshot of some tables in Excel. I know how to copy the data. I now want to store the copied data into files in a temp directory. How do I take the information which is now on the Clipboard and paste it to a file which can be saved in a temp drive?
View 7 RepliesI'm trying to create an overloaded method in a module, but if I type Public Overloads Function GetData(ByVal sql As String) As String it tells me "Inappropriate use of 'Overloads' keyword in a module". Are overloaded methods not allowed in modules?
View 3 RepliesI'm a c# developer and have not enought experience in VB.NET.the scenario:
Namespace Presenters
Public Class BaseFooPresenter
assuming the public default parameterless constructor[code]....
I can create a method SetValues( ... parameters ... ) and call it from the two constructors but does someone knwos a workaround to avoid this error?, why the compiler do not validate the possibility to call the base constructor before the overloaded constructor?how to justify logically the fact that it's not possible to call the base class constructor and another class level constructor from one class level constructor at the same time?
I wish to create a form with a translucent clientwindow but want to have all contained controls and the form border display as normal. Setting the form's Opacity level dims the entire form including its controls and this is not the effect I'm trying to achieve. I have achieved the desired effect by placing a second form behind the main form (with the main form's "TransparencyKey" property set) and adjust the background form's opacity level. This added a few issues to overcome in terms handling the z-order, handling click-through through the main form, and an additional form in the Alt-Tab sequence that I did not want.
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