Re: Virtual Dispatching - C# Discussion Boards

Re: Deserialize - comments?

1-Sep-05 13:34

I'm looking for feedback if the following makes sense:

- I declared an Interface IDocument:

public interface IDocument
{
  bool IsDirty { get; }
  void Save(System.IO.Stream stream, bool resetDirty);
  void Load(System.IO.Stream stream);
}

A Helper class implementing the Open/Close/Save/SaveAs/AskForFilename UI should work wiht the document(s) through this interface.

I'm a bit uneasy with the Load/Deserialize design: DeSerialize returns an objec. This makes sense but:
- I can't have a static Load method in the interface
- doesn't allow to implement "Revert"

So I did implement Load the following way:

public void Load(System.IO.Stream stream)
{
  System.Xml.Serialization.XmlSerializer ser =
    new System.Xml.Serialization.XmlSerializer(typeof(RTDocument));

  RTDocument loaded = ser.Deserialize(stream) as RTDocument;

  // overwriting members-to-be-serialized with the data loaded:
  Root = loaded.Root;
  // ....
}

Is this exceptionally stupid? Some better way?

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leppie1-Sep-05 14:14

leppie

1-Sep-05 14:14

Hehe, it took a while to figure out your 'problem'. Loading and saving is not really part of a document object but rather a document manager, if you want to serialize the document object. If you only serialize the document content then the way you described should be ok.

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Re: Deserialize - comments?

peterchen1-Sep-05 20:30

Re: Deserialize - comments?

1-Sep-05 20:30

Yeah, I arrived at that point, too.

I *think* it can be does by constructing a generic Document Manager just using the typeof(document).

Q: is it possible to override the default "[Serialize]" imlementatìon?

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Mathew Hall2-Sep-05 0:43

C#/.NET coding standards: private members

2-Sep-05 0:43

Q: is it possible to override the default "[Serialize]" imlementatìon?
Sure - inherit from ISerializable and then override the GetObjectData(SerializationInfo info, StreamingContext context) method. You may also need to supply a special constructor for your class (protected MyClass(SerializationInfo si, StreamingContext context)) - MSDN has conflicting info on this (see ISerializable[^] and Custom Serialization[^])

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peterchen1-Sep-05 13:11

1-Sep-05 13:11

What's the "good thing" to prefix private members?

example:

public bool IsDirty { get { return ??sDirty; } }
private bool ??sDirty;

m_ seems to be discouraged. As I understand, using lowercase isDirty is not a problem for private members - but what do you do?

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Christian Graus1-Sep-05 13:58

Christian Graus

1-Sep-05 13:58

I use uppercase for public, lowercase for private. To be CLS compliant, if you have a private member and you want a public property, you can't do this, because CLS compliance takes into account VB, which is crap and is not case sensitive. Instead, the recommmended syntax is to prefix with an _.

Christian Graus - Microsoft MVP - C++

Mathew Hall2-Sep-05 1:03

2-Sep-05 1:03

I use uppercase for public, lowercase for private. To be CLS compliant, if you have a private member and you want a public property, you can't do this

Not true (for C# anyway - VB is another story Dead | X|

) - if you mark your assembly with [assembly: CLSCompliant(true)] and then do something like this

protected string hello;<br />
public string Hello<br />
{<br />
  get<br />
  {<br />
    return this.hello;<br />
  }<br />
}

the compiler throws a fit but if you change

protected string hello;

to

private string hello;

everything works fine. I do all my coding in C# this way and VB doesn't have any problems using the assemblies

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Christian Graus4-Sep-05 10:23

Christian Graus

4-Sep-05 10:23

Interesting, I always use private over protected, but I've definately had to mark some methods as not CLS compliant in order to keep this approach. I wonder what was different ?

Christian Graus - Microsoft MVP - C++

Mathew Hall2-Sep-05 1:07

Re: drag and drop scrolling

2-Sep-05 1:07

I'd do the same as Christian (I loathe hungarian notation Dead | X|

)

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-- modified at 7:07 Friday 2nd September, 2005

drag and drop scrolling

xilefxilef1-Sep-05 10:20

xilefxilef

1-Sep-05 10:20

Hi
I have a treeview where I implemented drag and drop functionality; however, if there are many nodes, when I start dragging a node and put the cursor on the bottom edge of the control, scrolling downwards works (I assume it's a built in treeview feature), scrolling upwards, on the other hand, doesn't. How do I implement scrolling up functionality for drag and drop? Confused | :confused:

Thank you in advance.

-- modified at 16:22 Thursday 1st September, 2005

Judah Gabriel Himango1-Sep-05 10:27

Judah Gabriel Himango

1-Sep-05 10:27

You can use node.EnsureVisible() to make the control scroll some node into view. Using this, you should be able to achieve scrolling.

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can this be done in C# / .NET / WinForms?

peterchen1-Sep-05 10:08

1-Sep-05 10:08

I'm trying to bash my stubborn head through the .NET/ C# wall with a little project. before I start, I'd like to ask:

Can the following be done with reasonable effort:

- pretty heavy List Control custom draw
- Getting a DLL's version number
- Using WebForms for an app that can run both as Standalone Client and as a server-based application?

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Judah Gabriel Himango1-Sep-05 10:17

Judah Gabriel Himango

1-Sep-05 10:17

peterchen wrote:
pretty heavy List Control custom draw

Yep, custom drawing is a common practice, and I don't see why you couldn't do your own list control. Keep in mind though, it's better to reuse existing control, overriding only the parts you need. Writing a control from scratch, though it seems fairly simple, is quite the large task in the end.

peterchen wrote:
- Getting a DLL's version number

Yeah, sure:

using System.Reflection;
...
// Get the assembly
Assembly executingAssembly = Assembly.GetExecutingAssembly();

// Get the assembly name (which includes version)
AssemblyName assemblyName = executingAssembly.GetName();

// Get the version of the assembly.
Version assemblyVersion = assemblyName.Version;

peterchen wrote:
- Using WebForms for an app that can run both as Standalone Client and as a server-based application?

I'm not sure why you'd want to do this. A WebForms app as a standalone executable and as a server app (are we talking console app?) This is probably unlikely, I don't think you'd want to do this. What you *could* do is create a web forms app, then build a simply Windows Forms app that contains the WebBrowser control from Microsoft. Navigate the browser control to your webforms aspx file, and voila, you have webforms running as a standalone client application. Again, I don't recommend this. Depending on what you're doing, there's likely a much easier way of accomplishing your goals, but you'd have to let us know what you're trying to do before I can help further.

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peterchen1-Sep-05 10:37

1-Sep-05 10:37

Thanks

Judah Himango wrote:
Getting a DLL's version number

Does that work for "normal" Win32 binaries, too?

Judah Himango wrote:
I'm not sure why you'd want to do this

Just an idea (You see, I don't have a good overview of whast's suitable with the individual technologies). The app would be useful both as standalone, and across the LAN, and I wondered if I could feed both with the same code base. But I don't want to put significant extra work into it, and the LAN part is sufficient with push-publishing static HTML, too.

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Judah Gabriel Himango1-Sep-05 10:55

Judah Gabriel Himango

1-Sep-05 10:55

peterchen wrote:
Does that work for "normal" Win32 binaries, too?

I believe the reflection stuff is for .NET CLR assemblies only. There's probably a way to find the version number of Win32 dlls as well, most likely as part of the System.Diagnostics process (for instance, you can get the version number of a dll using the System.Diagnostics.ProcessModule class).

peterchen wrote:
Just an idea

If you mean inter-computer communication within a LAN, I'd use either .NET remoting or web serivces. Remoting is quite a bit faster than web services, but less portable and is for .NET-to-.NET communication only.

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Mathew Hall2-Sep-05 1:15

2-Sep-05 1:15

There's probably a way to find the version number of Win32 dlls as well

You can PInvoke and use DllGetVersion

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