My question is the title how would you write a delegate sub for a list box? (notice the how Im not asking for code but knowlage of how to do it - I looked at this tutorial but it did not really [URL]..
View 6 Repliesfrom 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?
I've created a Delegate that I intend to call Async.
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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)'.
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
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I need to take the results from a listbox and write them to a text file.
View 5 RepliesI have a listbox that has many items : microsoft | www.microsft.com office | www.office.microsoft.com and so on I want to be able to write these values to XML
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It may seem noobish but, I've been try forever! I've been postponing a database project for like 3 years and I finally come to some solutions except for when it deletes an Item from the list. On form load, the listbox generates data from a text file (we'll call text1) which has data in it. For every line of data in that text file (text1), there is a text file (text2) in a 2nd folder.
For example, there may be, in text1, a line named "Hi". In the 2nd folder there is a text file named "hi.txt" Another line (say the next line under 'Hi') is written as "Hello world", there will be a file in the second folder called hello world.txt"
May seem confusing but it works well. My problem is making that 1st text file that has ALL of the data that loads into the listbox, be rewritten over with the new data in the listbox OR remove a certain line of from the text file.
Im trying to write all the current movies in a listbox named "ListCart" to a text file called "orders.txt"[code]...
View 2 RepliesI need to write data from a list box to an lsv text file. I can do that if I rea an entire line at a time and write it out, but the data in the listbox are columnated.For example:Cey,Ron 50 75 75 66.67would be an entire line from the listbox. It was entered into the listbox by reading an lsv text file and using format string to set up column info, but I don't know how to read it back out by column, only by entire line.
View 4 RepliesI have a 4 listboxes, all 4 listboxes will be populated after I clicked the cmd_button. I need to have the items on all 4 listboxes written to a text (or preferably rtf file if possible)
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how to write the items in the right listbox to a .txt file using StreamWriter. I need the output line to resemble:
"set sv_mapRotation map mp_abandon map mp_afghan map mp_boneyard map mp_brecourt map mp_checkpoint map mp_complex map mp_crash" The order should be just like it is in the right listbox.
This is the code that I have set up to begin this:
myWriter.WriteLine("set sv_mapRotation" + " " + """" + """")
I wonder what the code in vb 2008 express edition I have to put, so you can enterdata in listbox, after purification?
View 1 RepliesHow to write the .net code for vb6.setitemdata for combobox or listbox item?
View 10 RepliesI'm trying to write some code which parses data and then populates a listbox. I'm using the IPWorks IPPort component which basically does the reading of port 30003. The ipport1_OnDataIn event is where all the action is. I parse the data, which works great.. however when I try and do something simple such as add text to a listbox, I get the dreaded error "Cross-thread operation not valid: Control 'lstListBox1' accessed from a thread other than the thread it was created on".I've googled the error and tried copy and pasting some workarounds but nothing seems to fix the issue.
If anyone can offer help, it would be greatly appreciated. If you could possibly show the code already implemented into mine, it would be even better so I can see how it works. It would make more sense to me. My code is below. The part i'm trying to get working is the lstlistbox1.items.add("Test") in Case "2". This is to just get it working.. I'll be adding listbox items in the other cases as well, and they'll be parsed values instead of "Test". This is just to simplify things at the moment.
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Let's say, when you click a button it just opens a specified .txt file and adds the data of it to a listbox. I mean automatically, without that file opening dialog showing?
View 1 RepliesSo...numeric sorts. Do I really need to write a custom comparer to make a listbox full of numbers sort itself like:
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I've got a program which displays data in a listbox in five columns. All are separated using one or more ControlChars.Tab. I want to write these columns to a text file, however, when I do, my columns lose their alignment. I can change alignment so that it displays nicely in text file, but then it is off in list box. Is there a way to get what I see in my listbox to display the same way in a text file - maybe a different way of separating my columns (not using ControlChars.Tab)?
View 7 RepliesIf I set a ListBox.Height = ListBox.PreferredHeight when the control is hidden and IntegralHeight = True, then set it visible:
a) Actual Height reduces by typically 3-5 pixels after redraw (but not 1 pixel per item).
b) PreferredHeight does not not appear to give the correct integral of item heights.
Is there a way to make ListBox calculate the correct integral Height before the ListBox is made visible, so it can be correctly pre-positioned from bottom edge?
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
ListBox1.Visible = False
ListBox1.IntegralHeight = True
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This code bellow to compile a single listBox on form1 to listBox on form2 then listBox on form3.
I want to modified this code to compile 169 of ListBoxs on form1 to 169 listboxs on form2
and 169 listBoxs on form3.Try this code,not need the new coding.
Original code from JoOl and modified by John Anthony oliver
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1 when my listbox returns resaults it only brings back 10 how do I set it to return lets say 500
and question 2 is when I click on my links in listbox it's not opening webpage as I would expect it...
This is my code
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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...
View 18 RepliesI heard once that .net introduced an already defined delegate with no parameter that we could use instead of creating one.
View 1 RepliesI came across a snippet of C# code which is very useful. I am trying to convert it to VB.NET, but can't seem to.
timer.Tick += delegate { panel.Children.Add(source); timer.Stop(); };
Is it possible to translate this to something similar in VB?
I have below code in C#:
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I'm having trouble converting a C# delegate to VB.NET.
How can this be done?
public MainForm()
{
InitializeComponent();
_twain = new Twain(new WinFormsWindowMessageHook(this));
_twain.TransferImage += delegate(Object sender, TransferImageEventArgs args)
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how can I convert the following code from C# to VB without exposing "variable" as global variable.
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I'm in the process of converting some existing code to VB. However, I'm running into a bit of a snag. It seems that in C#, a delegate can have a return value, but not so in VB. So my question is, how would I convert the following VB code to handle this?.[code]
View 3 Repliesim developing a way of calculationg differentil equations in VB 2008 using the 4th order ruge-kutta method. I pursched a book by Jack Xu called "Practical WPF Graphics programming".
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how this is written in VB.NET? This was an example I found on [URL]
ThreadPool.QueueUserWorkItem(delegate
{
var channelFactory = new ChannelFactory<ISimpleService>("*");
var simpleService = channelFactory.CreateChannel();
var asyncResult = simpleService.BeginGetGreeting("Daniel", null, null);
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