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nelsonpaixao wrote: why drag?
Requirement is drag and drop
If You win You need not Explain............
But If You Loose You Should not be there to Explain......
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Hi all,
A while ago I posted a question on this topic, and received a great response. I made use of the article posted by Sacha Barber called Beginners Guide To Threading In .NET Part 5 of n. In this article he uses the SynchonizationContext to marshall the background work to the UI thread.
But the thing is that when I send response back to a listview on the GUI thread x amount of time in quick succession the whole application just freezes / hangs.
Is this a bad idea doing it like this or am I just doing something wrong (maybe a different approach)
private SynchronizationContext context;
.....
.....
context = SynchronizationContext.Current;
if (context == null)
{
context = new SynchronizationContext();
}
.....
.....
try
{
for (int i = 0; i < (int)e.Argument; i++)
{
context.Send(new SendOrPostCallback(delegate(object state)
{
lViewTransactionHistory.Items.Add(lViewTransactionHistory.Items.Count.ToString(), DateTime.Now.ToLongTimeString(), 0);
}), null);
}
}
catch (InvalidOperationException oex)
{
MessageBox.Show(oex.Message);
}
The only programmers that are better those C# programmers are those who code in 1's and 0's ![Green Alien | [Alien]](https://www.codeproject.com/script/Forums/Images/alien.gif) |
 Programm3r
My Blog: ^_^
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Hi,
Is that 1) freeze/hang and never recover or 2) freeze/hang and then come back to life after a period of time. If it's the latter then you are sending too many messages to the UI thread and overwhelming the message queue. You may be able to work around this by sending the UI updates in batches rather than individually.
Alan.
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Alan N wrote: Is that 1) freeze/hang and never recover or 2) freeze/hang and then come back to life after a period of time.
Good question, I haven't waited long enough to check if the UI comes back to life, but I understand your point. Thank you
Regards,
| The only programmers that are better those C# programmers are those who code in 1's and 0's |
Programm3r
My Blog: ^_^
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Hi,
Answer: 1) freeze/hang and never recover
How should this be treated?
Many thanks again
Kind regards,
| The only programmers that are better those C# programmers are those who code in 1's and 0's |
Programm3r
My Blog: ^_^
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I am not sure about this case but generally it's better to use AddRange method for adding many items to the listview. Also, use BeginUpdate() EndUpdate() methods so that your listview isn't repainted any time an item is added.
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Giorgi Dalakishvili wrote: Also, use BeginUpdate() EndUpdate() methods so that your listview isn't repainted any time an item is added.
Thanks for the response. I noticed that when I change the listview control to a listbox the problem does not occur anymore, so I will try the above mentioned response.
Many thanks
Kind regards,
| The only programmers that are better those C# programmers are those who code in 1's and 0's |
Programm3r
My Blog: ^_^
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Which overload of AddRange method are you using? Try using the one that takes ListViewItem[] as a parameter.
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To be exact:
if (this.InvokeRequired)
{
this.Invoke(new EventHandler(delegate
{
lViewTransactionHistory.BeginUpdate();
ListViewItem item1 = new ListViewItem(DateTime.Now.ToLongTimeString(),0);
item1.SubItems.Add(i.ToString());
item1.SubItems.Add(TcpServer.connectData[i].Request);
item1.SubItems.Add("OK");
item1.SubItems.Add("CMD_PING");
lViewTransactionHistory.Items.AddRange(new ListViewItem[] { item1 });
lViewTransactionHistory.EndUpdate();
}));
}
else
{
...
}
So yes I am using the correct method overload.
| The only programmers that are better those C# programmers are those who code in 1's and 0's |
Programm3r
My Blog: ^_^
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You are doing practically the same thing you were doing in your original code. Instead of adding items one by one, store them in an array and add them in batch. If you are using backgroundworker you can use Result property to store listviewitem[] and access it when the worked is completed. In this case you can just add the items without the need of Invoke.
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Ok, I understand what your saying, the only thing is that I wanted to display each of the events of the TCP server as it was received, real time. But if I put it into a batch / array and display it every x amount of time, this won't be the case. So this is what I wanted to achieve. But thank you very much for the info and help.
regards,
| The only programmers that are better those C# programmers are those who code in 1's and 0's |
Programm3r
My Blog: ^_^
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If you are using BackGroundWorker, you can report progress when event is received and pass necessary info or the item to it. In the ProgressChanged event handler you will not invoke to update listview.
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i have placed a data grid inside a panel if the data grid have the record the panel will expand and if the data grid don't have a data then the height of the panel will be zero. how
i change a height property of a Panel according to the click of the
user how to set the height property and scroll property at run time
KnightGuy
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From what I understand you are trying to do, you are trying to set the size of your panel to be equal to that of the contents inside of it?
You can loop for that
int i = 0;
int max = panel1.controls.items.count -1;
panel1.height = 0;
while i <= max
{
panel1.size += panel1.controls.items.i.height;
i++;
}
'edit
you can suspend your layout so you don't see it resize
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Dear,
Can anyone give me a code that can print DataGridView in C#.NET 2005?
Socheat
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I can't but Google can 
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Try rent-a-coder or google.
Jeez, we WORK for a living and you want us to give out da codz for free? Ask your Mumma about the meaning of the word 'polite'
Panic, Chaos, Destruction.
My work here is done.
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Socheat.Net wrote: Can anyone give me a code
Once you say that, the answer automatically becomes "No", regardless of what the rest of the question or post says. You've been around here more than long enough to know that.
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I posted a question a little while ago about how to link a treeview to a list view.
What i actuli was trying to say is "How Do you Binding a ListView to a TreeView"
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Will you not do this. Post one question about a topic and then stick with it. Don't spam the boards.
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Try keeping to one set of posts and put a useful topic. As far as I can remember, you have been asking this for the last 2 days and have been given loads of useful hints, so your best bet is either get a few books on programming in general and C# in particular, or try another career.
Bob
Ashfield Consultants Ltd
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Hi
I am new to c# and im trying to link a treeview to a list view.
Thanks in Advance
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And do what? One of the first things you need to learn as a developer is how to lay out your requirements. From your question, I have no idea what actions you expect.
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Oh Sorry.
Im trying to make it so that when click on a node in the treeview it will display in the treeview.
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