How to call a class or function accoring to a given text name? - C# Discussion Boards

Re: How to call a class or function accoring to a given text name?

30-Sep-07 22:43

I want to realize the following:

I have created several buttons, each of them has a name related to a function (i.e. the function name is the same to the button name). Now I want to call the corresponding function according to which button you click. Of course, you can not use "switch" or "if" conmmands to realize it. because the buttons as well as the funcitons are not fixed.

for example, I have buttons with name A, B, C,...
there are also the corresponding functions void A();void B(); void C();...
I want to call void A() if you click button with name of "A", I want to call void B() if you click button with name of "B", and so on.

Could you please give me an simple method for that?

thank you very much.

Pete O'Hanlon30-Sep-07 22:56

Pete O'Hanlon

30-Sep-07 22:56

OK - assuming that your buttons and functions have better names than A, B and C, you could use reflection to handle this. Off the top of my head, I would expect that you could handle this with:

private void ButtonHandler(object sender, EventArgs e)
{
  string name = ((Button)sender).Name;
  this.GetType().InvokeMember(name, BindingFlags.InvokeMethod | BindingFlags.NonPublic | BindingFlags.Instance, null, this, new object[] { });
}

Then all you would need to do is wire up your buttons to this one event handler.

Deja View - the feeling that you've seen this post before.

Re: How to call a class or function accoring to a given text name?

Seraph_summer30-Sep-07 23:10

Re: How to call a class or function accoring to a given text name?

30-Sep-07 23:10

thanks a lot!
I will try it!

Pete O'Hanlon30-Sep-07 23:22

Pete O'Hanlon

30-Sep-07 23:22

No problem.

Deja View - the feeling that you've seen this post before.

.NET Ftp class problem

Stevo Z30-Sep-07 22:23

30-Sep-07 22:23

HI,

I'm using FtpWebRequest class to provide ftp communication in my application. All is fine, except it sometimes fails. I've tried everything what I could, it just sometimes fails - throws

System.Net.WebException: The remote server returned an error: (500) Syntax error, command unrecognized.
at System.Net.FtpWebRequest.SyncRequestCallback(Object obj)
at System.Net.FtpWebRequest.RequestCallback(Object obj)
at System.Net.CommandStream.Abort(Exception e)
at System.Net.FtpWebRequest.FinishRequestStage(RequestStage stage)
at System.Net.FtpWebRequest.GetResponse()

To be more specific - it is download command (WebRequestMethods.Ftp.DownloadFile).

It runs on a speparate thread in background worker, code :

 <br />
FileStream clientStream = new FileStream(this.DestinationPath, FileMode.Create);<br />
                               FtpWebResponse response = (FtpWebResponse)this.Request.GetResponse();<br />
                                this.GotResponse = (response != null);<br />
<br />
                                Stream ftpStream = response.GetResponseStream();<br />
<br />
                                this.ContentLength = response.ContentLength;<br />
<br />
                                int bufferSize = 2048;<br />
                                int readCount;<br />
                                byte[] buffer = new byte[bufferSize];<br />
<br />
                                readCount = ftpStream.Read(buffer, 0, bufferSize);<br />
<br />
                                long dataTransfered = 0;<br />
<br />
                                while (readCount > 0)<br />
                                {<br />
                                    if (this.Worker != null && this.Worker.CancellationPending)<br />
                                    {<br />
                                        canceled = true;<br />
                                        this.Request.Abort();<br />
                                        break;<br />
                                    }<br />
<br />
                                    this.CheckPause();<br />
<br />
                                    lock (this)<br />
                                    {<br />
                                        this.lastLoadedSize += readCount;<br />
                                    }                                 <br />
<br />
                                    dataTransfered += readCount;<br />
<br />
                                    clientStream.Write(buffer, 0, readCount);<br />
<br />
                                    if (this.ContentLength > 0)<br />
                                    {<br />
                                        int completed = Convert.ToInt32(((float)dataTransfered / (float)this.ContentLength) * 100);<br />
                                        this.ReportProgres(completed);<br />
                                    }<br />
<br />
                                    readCount = ftpStream.Read(buffer, 0, bufferSize);<br />
                                }<br />

where this.Worker - Worker object that provides thread for running.

I dont know if it is a problem inside WebRequest class or in my code(where ???) .

Thanx for any help!!

partymonkey1-Oct-07 2:49

partymonkey

1-Oct-07 2:49

Chances are the server doesn't understand one of the commands being sent. Check out this[^] for more information.

Stevo Z1-Oct-07 3:07

1-Oct-07 3:07

I can't open the link you posted.

TJoe1-Oct-07 3:10

TJoe

1-Oct-07 3:10

I had a similar problem when accessing Microsoft's forums site through IE. Try flushing your cache (and delete any microsoft.com cookies) or switching browsers.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Stevo Z1-Oct-07 3:11

1-Oct-07 3:11

I did in diffrent explorer Smile | :)

Stevo Z1-Oct-07 3:17

Re: .NET Ftp class problem [modified]

1-Oct-07 3:17

I don't thing that server doesn't recognize that command, because it works most of the time. It fails only from time to time, unpredictably.

It's behavior is like races when doing multi threading (of course it is done using separate threads, but the whole operation runs on one thread -> Get Response, Download data (write data to HDD), Close stream).

I'm desperate Frown | :(

TJoe1-Oct-07 3:20

TJoe

1-Oct-07 3:20

The link that partymonkey posted has a method for gathering some trace information, which may help you debug the issue.

Take care,
Tom

-----------------------------------------------
Check out my blog at http://tjoe.wordpress.com

Stevo Z1-Oct-07 3:44

1-Oct-07 3:44

I've created that log, it seems that it might be helpful, thanx.

item in combobox

justintimberlake30-Sep-07 22:20

justintimberlake

30-Sep-07 22:20

how can i make item in combobox invisible? the item is in middle of combo if i remove it. it will effect the whole indexing so i want to make it invisible

Re: item in combobox

Stevo Z30-Sep-07 22:30

How to select and edit a line with Graphics GDI+ in C#?

30-Sep-07 22:30

Hi,

I don't think that it's possible to make it invisible.

if u can't rely on indexes, create wrapper for your object, where U can add a int field with index(key, whatever). Then just get the SelectedItem and if it's not null, read that item index. Override ToString() method of your wrapper object, to make combobox display whatever tou want to display.

Stevo

hope that helps

Seraph_summer30-Sep-07 22:11

Re: How to select and edit a line with Graphics GDI+ in C#?

30-Sep-07 22:11

I have one simple but difficult problem:

I plot some lines in a panel with Graphics in C#, now I want to select one of them to edit it.
I don't know how to select it?

xiachunmin

Martin#30-Sep-07 22:25

Martin#

30-Sep-07 22:25

Hello,

You have to do it all by yourselve, AFAIK.

I think the fastest way is to handle the MouseDown and MouseUp event of the Panel.
Save the two MousePoints, as this will discripe an rectangle, SelectionRectangle.

Then you have to iterade over all your lines and validate each of the lines.
You could use the IntersectsWith method of the Rectangle class for that.

Hope it helps!

All the best,

Martin

Re: How to select and edit a line with Graphics GDI+ in C#?

Guffa30-Sep-07 22:43

Guffa

30-Sep-07 22:43

Not as simple as you might think. You have to specify your problem a bit more clearly.

What exactly is it that you want to select? The lines that you have drawn doesn't exist as lines any more, they are just differently coloured pixels on the screen, so what you have to select is something that you use to keep track of the lines. How do you keep track of the lines?

What method do you want to use for selection? Detecting mouse clicks?

---
single minded; short sighted; long gone;

Re: How to select and edit a line with Graphics GDI+ in C#?

Seraph_summer30-Sep-07 22:53