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Hi,
here are a few simple rules that should guide you:
there are several steps to draw something so it becomes visible on the screen:
1.
decide upon what object you want to draw; it normally is a Control (e.g. a Panel) or a
Form itself. I prefer to add a Panel to a Form, then draw on the Panel.
2.
create some variables (Rectangle, struct, class, whatever) that hold the parameters of
your drawing. For a rectangle that could be top and left coordinate, and width+height,
or just a Rectangle. etc.
3.
create a Paint handler (either add your own paint handler to the Paint event, or
override the OnPaint method) for that Panel, and do all your drawing in there,
using the Graphics class and your variables.
4.
when you want to change things, modify the variables and call Panel.Invalidate() or
one of its overloads (for selective invalidation).
5.
If you want to animate things, perform the move (step 4) inside the Tick handler
of a Windows.Forms.Timer
BTW: if you need to create some objects (Fonts, Pens, Brushes, ...) either keep them
alive in class members (hence create them only once); or create them inside the Paint
handler and don't forget to call Dispose() on them.
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
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Those are some really useful steps, I'll try to keep them in mind 
Thanks a bunch.
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Did u solve your problem???
A S E L A
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God took ages to find my post ..
Anyway I've made some progress and still stuck on other part.
I have 3 different functions, one for graphic, second for graphic and third for axis.
I solved the paint problem with Axis, since its static and never changes, so it was quite easy to convert to paint event. On the other hand, graphs have both 2 parameters that they receive and the graph changes after that according to the values given.
Example : public void JoonistaGraafik(int k1, int k2)
now when I want to make it to paint event "public void JoonistaGraafik(object sender,PaintEventArgs e, int k1, int k2)"
I have problem calling out in InitializeComponents();
this.GraphPanel.Paint += new System.Windows.Forms.PaintEventHandler(JoonistaGraafik(slider_a, slider_b));
the thing is that, my two values "slider_a" and "slider_b" are generated in the trackbar_scroll event and then JoonistaGraafik(slider_a, slider_b); was called out.
I'm pretty bad in explaining, but I hope that made a bit sence.
In conclusion, the question is, how can I call out
"this.GraphPanel.Paint += new System.Windows.Forms.PaintEventHandler(JoonistaGraafik(slider_a, slider_b));"
if the slider_a and slider_b values have to change when I move the trackbar.
Thanks, and sorry for not replying so fast.
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Hi
I have enter event for textbox that change the background color
How can i activate this event from my button click ?
thank's
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If the signatures are the same, then they can call the same event. If not, and I don't think so, factor your code out to a method and call it from both events.
Christian Graus
Driven to the arms of OSX by Vista.
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4 people answered this question few posts below. You should follow williamnw's advice and put your code in a separate method and call it from the button's click too.
Eslam Afifi
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sometimes, I am out of my mind and can't even think about trivial things.
While it is ok, to ask questions, no matter how trivial they might be, but if the questioner does not understand the response, it shows lack of understanding of the basic idea they are asking. 
At least if the OP would ask a fellow up question (of course on the same thread) or ask for clarification, it shows they are in the discussion. Just simply going and creating a new thread because s/he did not understand the response is sheer maddening.
Yusuf
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Yusuf wrote: sometimes, I am out of my mind and can't even think about trivial things.
Yeah, it happens. Sometimes, I look at some code I wrote and I realize that it could have been done better. Sometimes, the simplest things don't cross the mind.
Eslam Afifi
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I still dont understend, can i get sample code ?
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E_Gold wrote: I still dont understend
How are you going to understand if you keep posting the same question, again and again. See what people are suggesting, understand the reply then if there are area not clear to you post follow up questions on the same thread. That way the discussion can continue until you understand it.
E_Gold wrote: can i get sample code ?
what good is it to get a sample code with out understanding the basic problem.
Way way back, I took a class with a very good professor. It was a programming class. Before we could submit our code, he would ask us to present a pseudo code. The pseudo code does not have to resemble real code. You could write him a paragraph of the problem and how you intent to solve it. then he will give us the go ahead to code it. I found that technique to be very helpful and still use it in my professional work everyday. In Fact I solve most of my problems away from the computer.
Step back write down what you are trying to do, then when evey thing is clear in your mind it is very easy to write the code. The code is nothing but syntex and symantec, still you will need to come up with the logic.
Yusuf
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You can call the method that normally handles the event directly as has been suggested.
To actually raise the event you need to get access to the TextBox's OnEnter method. This isn't as easy as the question you posed earlier so I think the others are being a bit harsh flaming you.
There are two ways that I know of. The first involves reflection:
typeof(TextBox).GetMethod(
"OnEnter", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic
).Invoke(
textBox1, new object[] { EventArgs.Empty }
);The other is to subclass the TextBox and add a public PerformEnter method. From it call OnEnter(EventArgs.Empty), and use your derived TextBox instead of the original.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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thank you very much!!!
this exactly what I need.
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Doing what he suggested in your instance, makes you an idiot. If you couldn't understand my answer, then you're an idiot. You sure as hell should not be writing any code that anyone is paying for, or that will be used anywhere.
Christian Graus
Driven to the arms of OSX by Vista.
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I was about to 1-vote you for demeaning this person - then I saw his user details, and he is a software developer! (I had sort of assumed he was a kid with little or no experience)
Have a 5 instead!
___________________________________________
.\\axxx
(That's an 'M')
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I agree totaly - I was working on the assumption that he *really* wanted to raise the event again (for reasons unknown) as he said in the question.
Of course, if all he wants to do is re-run the handling code for the Enter event, all he needs to do is call that method, or move the code out to a common method and call that from both handlers.
(Btw, TextBox.Enter and Button.Click do both have the same signature.)
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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Hi
people, why you so angry ??
isn't this forum for asking question ?
English in not my mother tongue and maybe i don't explain my self well
if someone uninterested to help - don't help !!
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I have a publish/subscribe application running on a single machine.
The system uses 2 ipc remoting channels, one set up on the installed service (which has no issue) and another set up on a client.
The client sends uri information to the service via the service's remoting channel so telemetry can be sent to the observing client. I can connect to the service and do everything I need to do with it's ipc channel, but when I try to connect to the client's channel I receive an Access Denied error.
The service is installed as "Local System" permission. I presume that this is a security issue but I can't seem to get it right... Any suggestions?
Thanks!
Scott P
"Simplicity carried to the extreme becomes elegance."
-Jon Franklin
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carbon_golem wrote: I presume that this is a security issue
carbon_golem wrote: Any suggestions?
My first suggestion is don't presume. Perhaps you could configure your system so that all it's processes are running under the same account and verify that the error is resolved under those conditions. If it is, some form of that could be a solution, correct?
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led mike wrote: My first suggestion is don't presume.
100% correct. I should UNlearn what I have learned.
It turned out that it WAS and WASN'T a security issue. I set the default security with the way I created the IpcChannel. I had to set it up using Hashtable props that include the security settings. If I hadn't taken the shortcut and did it the right way I would have spotted this right off.
Thanks for the help, I appreciate it!
Scott P.
"Simplicity carried to the extreme becomes elegance."
-Jon Franklin
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I don't know why I didn't try this before. I had the client publishing it's IpcChannel with it's string uri only, and this won't work apparently if there's any kind of security needed. You need to specify the dictionary definitions when you create the channel as follows:
public static void Publish() {
var serverProvider = new BinaryServerFormatterSinkProvider();
var clientProvider = new BinaryClientFormatterSinkProvider();
IDictionary props = new Hashtable();
serverProvider.TypeFilterLevel = TypeFilterLevel.Full;
props["name"] = "Client";
props["portName"] = LogOnInformation.LogOnChannel;
props["typeFilterLevel"] = "Full";
props["exclusiveAddressUse"] = "false";
props["authorizedGroup"] = "Everyone";
props["rejectRemoteRequests"] = "true";
var chan = new IpcChannel(props, clientProvider, serverProvider);
ChannelServices.RegisterChannel(chan, false);
client = new LocationViewProxy(LogOnInformation);
RemotingServices.Marshal(client, LogOnInformation.LogOnHost, typeof(LocationViewProxy));
}
Thanks to those of you who looked.
Scott P.
"Simplicity carried to the extreme becomes elegance."
-Jon Franklin
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Hi there,
I am reading a (rather large) MS-SQL stored procedure into C# using the SqlDataReader. I expect this to return slightly over 8,000,000 records, but it consistently maxes out at 726,301. I cannot for the life in me see why - when running the stored procedure (which has no input parameters) in SQL Server Management Studio it returns the correct number of records.
I am running VS 2008 Professional with SQL Server 2008 Developer Ed. The code is paraphrased as follows:
// Set up a list of data type Record (my own) to hold the output of the sp
List<record> records = new List<record>();
System.Data.SqlClient.SqlConnection Connection = new
System.Data.SqlClient.SqlConnection(ConnectionString);
System.Data.SqlClient.SqlCommand Command;
try
{
Connection.Open();
{
Command = new System.Data.SqlClient.SqlCommand("StoredProcedure", Connection);
Command.CommandType = CommandType.StoredProcedure;
System.Data.SqlClient.SqlDataReader Reader = Command.ExecuteReader();
while (Reader.Read())
{
Record NewRecord = new Record();
NewRecord.PAR1 = Reader.GetInt32(Reader.GetOrdinal("PAR1"));
NewRecord.PAR2 = Reader.GetInt32(Reader.GetOrdinal("PAR2"));... etc
records.Add(NewRecord);
}
}
}
catch
{
}
finally
{
Connection.Close();
}
Thanks a million for any help!
Ben
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Hi,
why don't you catch an Exception and look at all its information, using Exception.ToString().
Chances are the problem has been reported but you showed no interest.
Could be a timeout, an out-of-memory condition, ...
Since the number of rows returns is constant, I do expect an OOM.
BTW: if 8 million is what you expect, how many records are there?
And if you were to want all existing records, why use a SP in the first place?
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
modified on Sunday, June 12, 2011 9:07 AM
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Hi Luc,
Thanks for your reply. In answer to your questions: I don't get an exception - it just terminates the while(Reader.Read()) loop at 7263001 records. I have actually slightly increased the field count of the query (which makes it also take much longer) - but this doesn't affect the number of records it tops out at, which made me think that timeout and oom might not be the reason.
I used a sp in order to be able to test and maintain the query on the server rather than just having a long text string select statement in my C# code.
Cheers, Ben
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Hi Ben,
Ben Cocker wrote: I don't get an exception
you may have misunderstood me. What I meant is your code (catch{}) just swallows exceptions if and when they occur, so it may seem you don't get any. Did you try a
...
catch(Exception exc) {
log(exc.ToString());
}
...
where log is some logging method, a Console.WriteLine, a MessageBox.Show, whatever you fancy.
Also, I'm not familiar with the Record class, is it standard .NET stuff or is it yours? any idea what the size of its objects is? I hope it isn't duplicating information, such as table metadata all over.
BTW: "only 1.5GB" (from your other reply) is a phrase I never used so far
Luc Pattyn [Forum Guidelines] [My Articles]
- before you ask a question here, search CodeProject, then Google
- the quality and detail of your question reflects on the effectiveness of the help you are likely to get
- use the code block button (PRE tags) to preserve formatting when showing multi-line code snippets
modified on Sunday, June 12, 2011 9:07 AM
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