C#

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Circular Reference Hell! RFickling6-Nov-04 12:55 RFickling 6-Nov-04 12:55  Hi, I am trying to use a class in multiple projects. It is a simple class containing properties of a given database table. The class, DbTable, is defined in my main DbCompare project. I also want to use this class in a Control Library (UserControl) project which will itself be used in the DbCompare project. However, I am in circular reference hell! When I build the DbCompare project, I get the warning 'DbCompare.DbTable' is defined in multiple places; using definition from 'D:\Proj_net\DbCompare\DbTable.cs'. Does anyone know how to do this? TIA, Royce Re: Circular Reference Hell! Colin Angus Mackay6-Nov-04 13:16 Colin Angus Mackay 6-Nov-04 13:16  If you can re-architect your application I would suggest using events to avoid the circular references. If you have a layered approach like this: Presentation ---------------- Business Logic ---------------- Data Abstraction The Presentation can invoke methods directly in the Business Logic layer, and the Business Logic layer can do the same to the Data Abstraction layer. However the Data Abstraction layer should know nothing of the Business Logic layer, and the Business Logic layer should know nothing of the Presentation layer. Think about how the .NET Framework achieves this. The guys at Microsoft know nothing of your application, so the controls fire off events in order to pass messages to your code. So, If the Data Abstraction layer needs to invoke something in the Business Logic layer it should fire off an event that something in the Business Logic layer subscribes to. Similarly with the Business Logic layer needing to invoke something in the Presentation layer. Does this help? Do you want to know more? Re: Circular Reference Hell! RFickling6-Nov-04 13:30 RFickling 6-Nov-04 13:30  Thanks, Colin. Yes, I think you have given me some useful ideas. I need a simulator for ..........? Sakkijha6-Nov-04 11:38 Sakkijha 6-Nov-04 11:38  hi, i am taking a network corse in college, my prof. ask for a simulator for a telecomunication network , such that 2 guys talk to another one but not in the same time ; if person A is talking with C the B is on Hold. any 1 can help ? "the problem that i don't know how to use graphics in c#" I realy need Help Re: I need a simulator for ..........? tom_dx6-Nov-04 11:51 tom_dx 6-Nov-04 11:51  you don't have to, just use a console version or use symbolism, or even switch off pictures IM PROUD TO BE A GMAIL; Re: I need a simulator for ..........? Sakkijha6-Nov-04 12:03 Sakkijha 6-Nov-04 12:03  hi, thanx 4 ur replay, but i think I didn't get ur point Re: I need a simulator for ..........? tom_dx6-Nov-04 13:12 tom_dx 6-Nov-04 13:12  improvise;P IM PROUD TO BE A GMAIL; Re: I need a simulator for ..........? Christian Graus7-Nov-04 15:31 Christian Graus 7-Nov-04 15:31  Sakkijha wrote: "the problem that i don't know how to use graphics in c#" The other poster is suggesting you don't need to use graphics. I tend to agree - you'll be marked on how well your simulator works, not how pretty it is. Christian I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer can't get two EXEs to share the same DLL? vista276-Nov-04 11:16 vista27 6-Nov-04 11:16  For some reason, as simple as this seems, I'm having trouble getting it working. My scenario: I have one dll that I want shared by two exes. What I want to happen, is EXE1 will make a call into the DLL, and in that function call the DLL will raise an event that will be caught in EXE2. what I have done is in both EXE1 and EXE2 project, I have referenced the same DLL. When EXE2 loads up, it registers the dll event, and when EXE1 calls that function in the DLL that fires that event, registered by EXE2, it doesn't work because the event is null. So the event was never registered. Is this because both EXEs are using their own copy of the DLL, and not REALLY sharing the same DLL? How can I achieve the behavior desired? thanks Re: can't get two EXEs to share the same DLL? Colin Angus Mackay6-Nov-04 12:59 Colin Angus Mackay 6-Nov-04 12:59  vista27 wrote: Is this because both EXEs are using their own copy of the DLL, and not REALLY sharing the same DLL? Although DLLs allow you to share the same code between two applications the data isn't shared. Hence the event fired in one EXE is not picked up by the other EXE. vista27 wrote: How can I achieve the behavior desired? I have to admit never having needed to do this. The closest I've ever got is a web application making a change in a database and a Service process checking the database periodically to see if there is any new data. The event of the web application is picked up in the service which is a similar scenario, but the service spends most of its time asleep and only polls the database once a minute. How soon does the event need to be picked up? If a wait of a minute is acceptable then something similar to my previous solution may work for you also. Although I have not used it, Message Queues may be what you are looking for. MSMQ - Overview[^]. C#: A Message Queuing Service Application[^] Do you want to know more? Re: can't get two EXEs to share the same DLL? Dave Kreskowiak6-Nov-04 17:14 Dave Kreskowiak 6-Nov-04 17:14  To add to waht Colin said, you can't share a .DLL like this between two .EXE's because, like he said, the data is no shored between processes. The .DLL doesn't run in it's own process. It's injected into the process that's using it, therefore each .EXE has seperate instances of the data for the same .DLL. Using a .DLL, you can't get the functionality you want. You'll have to rewrite the .DLL and code it to use the singleton pattern and pass data back and forth through remoting. There is no way to adapt the .DLL to your requirements. RageInTheMachine9532 "...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome Re: can't get two EXEs to share the same DLL? Peff6-Nov-04 17:25 Peff 6-Nov-04 17:25  I think this can be accomplished using remoting and a singleton class. Take a look at the following article: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dndotnet/html/hawkremoting.asp[^] Hope this helps. Stefan Detect Server Software (i.e. Apache)? Justin Garrick6-Nov-04 8:47 Justin Garrick 6-Nov-04 8:47  Does anyone know how if its possible to tell what software a server is running (i.e. Apache, etc) using a HttpWebRequest as a starting point? I'd like to be able to get the current server time as well, if possible. Couldn't find an example in the MSDN library - any ideas, suggestions? Thanks, Justin Identify this form? Justin Garrick6-Nov-04 8:03 Justin Garrick 6-Nov-04 8:03  Can anyone tell me what kind of form this - http://people.clemson.edu/~jegarri/box.gif - is? I would like to have something similar, with the categories at the top, but I can't find anything like it in the Windows forms available in VS.Net 2003. Thanks, Justin Re: Identify this form? tom_dx6-Nov-04 8:16 tom_dx 6-Nov-04 8:16  list control http://www.codeproject.com/cs/miscctrl/aa_listview.asp[^] IM PROUD TO BE A GMAIL; Re: Identify this form? Justin Garrick6-Nov-04 8:44 Justin Garrick 6-Nov-04 8:44  Terrific, I completely missed that one, thanks Tom. Thanks, Justin Re: Identify this form? tom_dx6-Nov-04 11:50 tom_dx 6-Nov-04 11:50  np IM PROUD TO BE A GMAIL; Boreland C# personal edition Underhillron6-Nov-04 5:42 Underhillron 6-Nov-04 5:42  Has anyone downloaded Boreland's C# personal edition ? How in the heck do you activate this bugger ? The code supplied by Boreland which is supposed to be put into the documents and setting root directory doesn't work ? Holy cow, can anyone help me here ? I just want to teach myself C# , not steal from them. As an absolute beginner to this language, does anyone of some great C# books to recommend ? Thanks for your help. Happy Trails . Re: Boreland C# personal edition Pooria Madani6-Nov-04 8:04 Pooria Madani 6-Nov-04 8:04  take it easy , C# is for Micorosft , using Visual C# , Visual C# is as Compelete and Power than C# Bilder . strat with Microsof tVisual c# if you need help i can help you My Yahoo Email is : pooria1212002@yahoo.com and my MSN Mail is : pooria_madani@msn.com Re: Boreland C# personal edition yoaz6-Nov-04 22:16 yoaz 6-Nov-04 22:16  havn't downloades Boreland's stuff, but if you just want to teach yourself the language, try downloading the latest beta visual c# express (it's beta so it's free) from here[^]. there's documentation there and sample apps. there are no facts, only interpretations Re: Boreland C# personal edition Christian Graus7-Nov-04 15:33 Christian Graus 7-Nov-04 15:33  Buy Inside C# by Tom Archer. And ditch Borland, you're better off with some of the free IDE's around if you can't get VS.NET, but if you're a student, the student edition is incredibly cheap. Christian I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer difference of GDI+ & OpenGL visitsaadi6-Nov-04 4:40 visitsaadi 6-Nov-04 4:40  hi friends... i know that GDI+ & OpenGL are a graphic programming model... and i guess that C# supports both of them... but i want to know what is difference of them..?? how about their programing syntax...?? ... and is there any difference between GDI and GDI+ ??!! please explain about these. Re: difference of GDI+ & OpenGL Christian Graus7-Nov-04 15:35 Christian Graus 7-Nov-04 15:35  visitsaadi wrote: and i guess that C# supports both of them I doubt it. You may be able to get C# to use OpenGL, but it does not support it 'out of the box'. visitsaadi wrote: and is there any difference between GDI and GDI+ ??!! For you to ask these questions, you obviously have little to no idea what you're asking, i.e. you've done no research. OpenGL is a 3D library, like Direct3D, but non-Microsoft. GDI+ is the new library that is designed to take the place of GDI. GDI is the graphical library that grew with each Windows release until GDI+ replaced it. The graphics library in C# is GDI+. To call old GDI functions, if you must, you need to IJW the functions in the dlls. Christian I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer TcpClient - waiting for connection quilkin6-Nov-04 4:19 quilkin 6-Nov-04 4:19  I am using TcpClient.Connect(ipaddress, portnumber) but the app must 'scan' a few possible IPs before finding the 'active' one. However if 'ipaddress' does not respond, the Connect() function hangs for nearly 60 seconds before raising an exception. Is there any way I can test for an IP quickly (e.g. a 'ping() command) before calling 'Connect()? I don't really want to get into starting separate threads for each possible IP address to search. Re: TcpClient - waiting for connection jahawkins6-Nov-04 4:56 jahawkins 6-Nov-04 4:56  I don't have access to the documentation right now but I thought you could set a time out on the underlying socket via TcpClient? -Jeff

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