.net - Using Action(Of T) Over A Custom Delegate Syntax For Readability?
Jan 7, 2011
Since .net 4.0, is the new ettiquette to use syntax such as:
Private Sub Main()
MyMethod(AddressOf AnAction)
End Sub
Private Sub MyMethod(ByVal toDo As Action(Of String, Integer, Boolean))
toDo.Invoke("Tom", 1, True)
End Sub
Private Sub AnAction(ByVal p1 As String, ByVal p2 As Integer, ByVal p3 As Boolean)
End Sub
[Code]...
This goes the same with Tuples/Func too. It is nice to write but feels a bit sloppy in places. Why would anyone want Tuple(Of T, T2, T3, T4) over a nice class type? My actual piece of code has these nested, so it passes the Action along in a chain of methods.
Sorry for the VB example, AddressOf is just VBs way of saying new Action(AnAction). Also I just wrote this into the browser so it might not compile either.How to people feel about reading and using these compiler generic actions as opposed to proper special entities crafted for their exact requirements in the solution?
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Jul 8, 2011
I am using this delegate to invoke my methode:
[Code]...
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Sep 20, 2010
This code snippet was converted from the c# snippet on this link A ChildWindow management service for MVVM applications There are two classes in this snippet first is my confirmessage class
[Code]...
Now this works fine in C# , however in vb,net the line where I add the event handler generates the following error on the message.callback property : Property access must assign to the property or use its value I am tearing out my hair on this I have never used the Action of T delegate before so could i be missing something simeple ? I can provide the c# code as well.
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Aug 5, 2009
I have a function Process(data, f) where data is a normal parameter and f is a function needed to process the data (passed as a delegate to Process)
The signature of f is int f(a,b,c), with a, b, c supplied by Process when it calls the delegate.
Up until here, standard delegate usage.
Now, I have a special but common case where I would like to call Process with a constant f function. So I would like to write SimpleProcess(data, k) so that the caller does not need to create a delegate in this case, just pass the constant k (the only information needed).
So I need to dynamically create a constant function, g(a,b,c) which takes 3 parameters (which are ignored) and always returns k. This has to be done within the SimpleProcess function, so that I can then simply call Process(data, g) from within that function, without the need to rewrite the whole Process function for this special case.
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Jan 12, 2010
I currently have a Win32 deployment package that I would like to include a custom action to send an email or contact a web service, is this possible?I know I can create a custom action to call an executable but I would prefer not to use this method and was wondering if i can send an email or call a webservice directly from the custom action.The reason I wish to do this is so that I am notified when the end user install's the package.
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Sep 20, 2009
How to add a custom action in C# setup project as creating a database in sql server by making selection of local or remote server during installation?
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Dec 9, 2010
I am using Visual Studio 2005. I have just figured out how to create a Custom Action during installation, but I can not figure out how to get data from the installer. Following is the simple test code that I am trying to use to call the directory that the user defines during installation, but the Path string is not returning anything.
Public Overrides Sub Install(ByVal stateSaver As System.Collections.IDictionary)
MyBase.Install(stateSaver)
Dim Path As String = MyBase.Context.Parameters("targetdir")
Dim AppConfigFile As String = Path & "FilesAppConfig.txt"
MsgBox("The target filepath is: " & AppConfigFile)
End Sub
I have tried many other things, such as...
Me.Context.parameters("targetdir")
stateSaver.item("targetdir")
And I entered /INSTALLDIR="[TARGETDIR]" in the custom action data property.
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Dec 5, 2011
Looking to have a list(Of object) where i can make my own Add method, so i can do some stuff to an item when added
Is that possible at all, been looking at the net and haven't found anything.
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May 26, 2009
I've created a program that creates a registry value when it is run, and when this program is uninstalled I need it to remove this registry value if it exists. So I wrote a little command line VB.NET program that simply checks for the reg value and removes it if it exists and I added this to the Uninstall section of the Custom Actions tab in the Visual Studio deployment project that I created for this app.
I know that the command line app works because if I run it myself manually it deletes the registry value, but when I uninstall my application it does not remove the registry value so obviously this command line app is not being executed.
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Sep 12, 2009
I've made a small program that creates a registry item in the users run key (basically starts the program on bootup), my question is does anybody know how to remove the item from all the users of the computer when the program is uninstalled?.
I know that all the other users registry hives aren't loaded at anyone time and feel a custom action dll that runs on uninstall that iterates through the 'documents and settings' folder loading the hives one at a time and removes the registry key.
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Oct 2, 2009
I am trying to kill my program when a new version is being installed through the installer using a custom action.
[Code]...
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Jan 4, 2012
I need to install a windows service via an .msi for many tablets which is nooooo problem. The problem is, the tablets currently have the service running which was installed by installutil. So when my installer runs, regardless of Remove Previous Version is true, it stops stating the service already exists and to uninstall it from Add/Remove Programs.So I wrote a console app which preceeds the primary output as follows:
Sub Main()
Try
Dim filename As String = "C:Program FilesRSCProjectServiceSetupRSCProjectService.exe"
'Dim filename As String = "C:RSCProjectServiceRSCProjectServiceinDebugRSCProjectService.exe"
If System.IO.File.Exists(filename) Then
[code]....
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Jan 30, 2010
from the documentation we have this: Multicast Delegate: Represents a multicast delegate; that is, a delegate that can have more than one element in its invocation list.
so am i right to say that Multicast delegate is no different from a normal delegate other than the fact that it has arguments. so System.Action is a 'normal' delegate whereas System.Action(T)(Byval obj as T) is a multicast delegate?
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Jun 22, 2011
While working on a project I have come across a way of not having to check if a string isnull or empty
dim sb as new stringbuilder
dim bob as string
sb.append((bob & string.empty).padLeft(10, " "))
Here, bob is not instantiated but doesn't throw a null reference error. In situations like this, is it more readable to do the above code or the below code?
if string.isnullorempty(bob) then
sb.append(string.empty.padleft(10, " ")
else
sb.append(bob.padleft(10," "))
endif
I personally think method #1 is more readable and maintainable.
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Oct 29, 2010
I'm writing a program in Visual Basic 2010. It's a HMI (Human-Machine Interface) and therefore has a whole whack of buttons that just send commands to other devices. As a result, there are a huge pile of event handlers for clicking buttons that can't really be broken down into modules (unless my understanding of modules is wrong). Essentially, I'd like to be able to move all the event handlers, for, say, button presses to a different file. Can this be done or is it important that they stay in "MainWindow.xaml.vb"? (All my buttons reside in one fullscreen window, some are hidden by tabs).
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Feb 9, 2010
I've created a Delegate that I intend to call Async.
[Code]...
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Jun 1, 2010
Code:
Public Class SendPings
Shared Sub New()
AddHandler Post.Saved, AddressOf Post_Saved[code].....
I get a error" Method 'Private Shared Sub Ping(item As BlogEngine.Core.IPublishable, itemUrl As System.Uri)' does not have a signature compatible with delegate 'Delegate Sub WaitCallback(state As Object)'.
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Oct 29, 2010
I'm trying to read my custom made syntax from a text file.[code]Okay from that line all I'm trying to read is "01" and "C:ext.txt"
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May 14, 2012
I am creating a custom log in page using VB in Visual Studio. Every time I try logging in, however, I get the following error:"Incorrect syntax near '.'".When I put in the wrong username/password combo it recognizes this, but when it is right it will get this error and fail to log in.
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Mar 28, 2011
a datacontext defined in a module(domain services ado.net ria)a page having add/delete methods whenever any method is executed, it is found that all the previous actions (NEW RECORD ADDITION and DELETION OF RECORDS) are carried out before the new action is carried out normally
this behaviour is not prominent but "when using break points and inspecting the values of the variables and table object to be added to context, it is clear that all the previous actions take place again. even when the datacotext. savechanges is called, even after that still all actions carried out on the datacontext repeat themseleves, when any new action is to be carried out
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May 24, 2010
Actually I want add some folders and files to MSI. Through custom action i want to copy that added folders and files to some destination/target folder.
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Apr 14, 2012
I am creating an Excel Add-In using Visual Studio 2010. My intention was to add a context menu to a cell and perform some action on the selected cell or cells. Here is the code I have got as of now
[Code]...
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Dec 8, 2009
I just converted the following code from c# to vb.net. It is functional and works correctly with my company's firmware/devices. My next challenge. Previous serialport code used much more readable structs which where then converted (after building a packet) into byte() automatically as part of the serialport encoding. (this is my understanding)How could I
1. morph byte arrays 'ToSocket' and 'ToMTP' below into structs and
2. convert into byte array for Socket.BeginSend(byte(),.....) to stream out to remote devices?
Imports System.ComponentModel
Imports System.Text
Imports System.Net.Sockets
[Code]....
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Mar 23, 2010
I am trying to write a VB.NET alternative to a C# anonymous function.I wish to call Threading.SynchronizationContext.Current.Send which expects a delegate of type Threading.SendOrPostCallback to be passed to it. The background is here, but because I wish to both pass in a string to MessageBox.Show and also capture the DialogResult I need to define another delegate within. I am struggling with the VB.NET syntax, both from the traditional delegate style, and lambda functions.My go at the traditional syntax is below, but I have gut feeling it should be much simpler than this:
Private Sub CollectMesssageBoxResultFromUserAsDelegate(ByVal messageToShow As String, ByRef wasCanceled As Boolean)
wasCanceled = False
[code].....
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Oct 12, 2011
I am having an issue trying to figure this out. I am writing a script editor that uses tabs (a tab control) and I want to implement syntax highlighting. My issue is that every sample I can find on syntax highlighting uses
Private Sub RichTextBox_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RichTextBox1.TextChanged
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Dec 16, 2009
Can any one translate the following syntax to vb.net.
m_TextBox.Loaded += TextBoxLoaded
m_TextBox.Loaded -= TextBoxLoaded;
private void TextBoxLoaded(object sender, RoutedEventArgs e)[code].....
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Sep 5, 2011
i have this code:Private Sub frmMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
[Code]...
Error 1: Option Strict On disallows late binding.Im using visual basic 2010 express on a gateway laptop thats running Windows 7 OS How do i resolve this error?
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Apr 9, 2009
I have a listbox and it it I am showing numbers.It should look like this (line by line) 1,2,3,4,5,6,7,8,9,10,11.....but is is showing it like this 1,10,11,...2,20,21...3,30...ow can I make it that it will show it in number order 1,2,3,4,5......
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Oct 21, 2009
I want to select some rows from a sql express 2005 table. I am using this expression: "Starttime >= " & dtpStart.Value dtpStart is a DateTimePicker But I am getting this error: Syntax error: Missing operand after '14' operator.
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Apr 22, 2009
While reading this threadthe code sample there came from MSDN, which was used to demonstrate the use of a delegate. I know what Delegates are. And I know how they work when it comes to things like crossing threads and even sinks.... how ever, the sample given is a simplecontrived example, and I'm wondering why/when would I use a delegate in this situation? Or in any situation? In my head, it seems it would have been easier/cleaner to call the function pointed to directly...
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