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not everything in dot net is serializable you should be able to find info on what is and isnt on msdn
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Serializing an UI control directly doesn't make sense. Better aproach is to put all your data in a simpler data structure like dataset or array.
No one ever became great by imitation.
Samuel Johnson (1709-1784)
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Well i was thinking for the sake of recreating bugs that happen on other peoples computers, how cool it would be to recreate the environment as much as possible.
Also i got another weird problem. After making functions to serialize and deserialize a test class i made...I decided to make that class extend control because i figured, the error messages only told me this in an inner exception:
<codecannot serialize="" member="" system.componentmodel.component.site="" of="" type="" system.componentmodel.isite="" because="" it="" is="" an="" interface.="">
So i did this to smack the xmlignore property on their:
[XmlIgnore]<br />
public override ISite Site<br />
{<br />
get<br />
{<br />
return base.Site;<br />
}<br />
set<br />
{<br />
base.Site = value;<br />
}<br />
}
and the exception message is unchanged.
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Well i was thinking for the sake of recreating bugs that happen on other peoples computers, how cool it would be to recreate the environment as much as possible.
Also i got another weird problem. After making functions to serialize and deserialize a test class i made...I decided to make that class extend control because i figured, the error messages only told me this in an inner exception:
Cannot serialize member System.ComponentModel.Component.Site of type System.ComponentModel.ISite because it is an interface.
So i did this to smack the xmlignore property on their:
[XmlIgnore]<br />
public override ISite Site<br />
{<br />
get<br />
{<br />
return base.Site;<br />
}<br />
set<br />
{<br />
base.Site = value;<br />
}<br />
}
and the exception message is unchanged.
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Arg! i tried overrided every public member in control and putting the [XmlIgnore] tag on them, and same error message...
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I am trying to create a form that needs to do some fast rendering (simple frequent resize, move, transparency). As far as I know GDI+ is not hardware accelerated, and it is PAINFULLY slow. I gave up trying to use double buffering and other methods of "improving" performance of GDI+.
Is there a way that I can create a form using hardware accelerated GDI(no plus) and handle its events?
I have a very simple form: full screen 50% transparent main form and a panel on it that is rapidly resized and moved about using the mouse. Doesn't seem like a tough task for a modern computer, but GDI+ is simply choking on this.
Any info/help/suggestions are greatly appreciated.
Thank you.
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Hardware acceleration == DirectX. GDI isn't going to do it any faster - why would it ?
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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I already got it to work using API calls and is A LOT faster.
Version 1.0 of GDI+ is very slow since its not hardware accelerated. GDI+ currently uses the cpu to perform its operations and no amount of double buffering techniques can stop graphics (or simple controls in my case) from severely flickering when moved about or resized.
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I realise we are supposed to open and close database connections when required rather than leaving a connection open but doing so kills the performance of my app which is a high speed database analysis tool. I do a lot of ExecuteScalar and ExecuteReader statements and opening and closing the connection every time seriously impacts the performance. Is there something I am unware of to make it faster?
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*just a question for anyone who has the spare time to show*
 I just would like to know how a cd burner works on the programmin side. I never understood how, i just new that it burns cd's etc....(lol)
-george-
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is it possible for me to use C# to create features similar to CAPTCHA at the "new user register" page to prevent automated registering?
Constance
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What's captcha ? Is that the thing where you get some text that's hard to machine read and you need to enter it in ? Yeah, that's easy to do using C#. Just write an image generator, and a random string generator, then store the string and check if the return value is the same.
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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Hi,
Yes, i am refering to that. Do you have any idea where to get sample C# codes for the image generator and random string generator. My knowledge on C# is very shallow and i need to finish my project fast. thanks.
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I guess the real question then is why someone with a 'shallow' knowledge of C# has a project to turn in 'fast' ??? Are you skating on the edge at work, or at school ?
Christian
I have several lifelong friends that are New Yorkers but I have always gravitated toward the weirdo's. - Richard Stringer
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If I have a form that is a set width and height, and I click on a menu item, thereby causing the form to become a different width and height, how do I cause the form to be recentered on the screen? Second, regarding mdi, how do I get other separate forms to become parented to the application's main form using the isMdiContainer = true property. That is, if I move the main form around the desktop, I would like any child forms to move within that main form's same deskspace. Any ideas? 
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The Form.Location property is the coordinates on the Screen where the Form is located. When the form is resized - whether a parent MDI or child MDI form - get the bounds of the parent (so for an MDI parent, this is the Screen.Bounds property) and do the simple path to adjust your form's location.
To get the current Screen on which the Form is mostly displayed (i.e., the majority is on a particular screen), use the static Screen.FromControl method.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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I have a user control which handles the printing of various document types, and therefore contains its own page settings, pring preview, and print dialogs. I'd like to be able to save (preferably to an application's app.config file) the PageSettings and PrinterSettings, but PageSettings doesn't seem to be serializable.
How can I go about doing this? Do I need to manually write out the individual settings, or is there some better mechanism?
Thanks!
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I would actually recommend saving page settings - perhaps even print settings - in the document itself if possible. This is actually a pretty common scenario.
For those types that aren't attributed with the SerializableAttribute, you need to implement ISerializationSurrogate to serialize and deserialize the object of a type for that surrogate (or write a generic one for all types, reflecting private and public fields yourself). The .NET Framework SDK has more details about this interface, though it's pretty straight forward to implement if you've ever implemented ISerializable.
To use the surrogate, when you create an instance of your IFormatter (like the BinaryFormatter), add an instance of your surrogate using IFormatter.SurrogateSelector.AddSurrogate to add the type (only a single type for each call, but you can use the same surrogate instance), the StreamingContext (which describes the medium to which you serialize, primarily), and the instance of your ISerializationSurrogate implementation.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Hi all,
In Windows File Explorer, when you select a file, it will shows additional info like Author and Title for .doc file, Dimension for images, length, aurthor etc for MP3s.
My question is how can I retrieve such information in C#? I am aware that AVIFileInfo gives such info for avi file and I wonder if there is a way that works on every file type?
TIA!
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While you can use an easy approach of interop'ing with shell32.dll (in VS.NET, add a reference to your project, click on the COM tab, and find "Microsoft Shell Controls and Automation") and using the Folder.GetDetailsOf method to get a property exposed to a column handler for that type. To get the right Folder, you can do something like this:
ShellClass shell = new ShellClass();
Folder folder = shell.Open("C:\path\My Music");
if (folder != null)
{
FolderItem file = folder.Items(0);
if (file != null)
string artist = folder.GetDetailsOf(file, 4);
}A better implementation is to get the IPropertySetStorage for the "\005SummaryInformation" storage stream, then use the IPropertySet to enumerate music properties (for example).
This requires quite a bit of knowledge about COM, COM interoperability with .NET (which is covered extensively in the .NET Framework SDK), and shell programming. I urge you to read the documentation for the two interfaces I previously mentioned before attempting this.
Why is this a better solution? The column handlers aren't gauranteed to be in a certain order and not every property is exposed through a column handler, so it limits your options. In may cases this may suit your needs, though. If you search for "GetDetailsOf" using the search feature of this site (the text box at the top of every page under the logo) you should be able to find a couple of articles that discuss this approach in more detail.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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Thank you and I will definitely read more into it
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Can I step into C++ COM object that I call from C# .NET web service in debugger? Both are mine. They're in the same project. It looks like it should be able to but can't load symbols for that interop.mycppobject.dll. Both projects are set to use/generate debug info and PDBs. Even when I put C++ PDB into the C# web service bin folder it still can't load symbols. How to make it to load sybols. Or may be the right question would be: how to make to create symbols for that interop....dll thing?
Help!
Thanks a lot!
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Symbols aren't necessary for the interop assembly because it's only a proxy. An RCW (Runtime Callable Wrapper) proxies calls and marshals data from managed code to a COM component. It's only PDBs for the managed (sans the interop assembly) and native components you need.
To debug both executables you need to attach the debugger to, IIRC, aspnet_wp.exe pre-Win2K3, or inetsrv.exe, IIRC, for Win2K3. The COM library is loaded into the calling process. For Win2K and XP this is the ASP.NET worker process. For Win2K3 and above (most likely) this is IIS itself because it manages the application domains.
You shouldn't move the PDB file, though. The full path is coded into the PE/COFF executable header. This can also be located in your PATH environment variable, but leaving it where it is is often the easiest approach.
This posting is provided "AS IS" with no warranties, and confers no rights.
Software Design Engineer
Developer Division Sustained Engineering
Microsoft
[My Articles] [My Blog]
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I'm on XP....
So. Wait. Debugger can step through from C# web service client into C# web service server (when it's on the same comp) and debug session in C# on the server side, but for it to debug COM objects for that session it needs to attach to the IIS which it already is debugging at that moment? Strange.
Sorry! I'm slow today.
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