Re: implicit cast - C# Discussion Boards

Ryan Cromwell30-Jul-02 9:33

30-Jul-02 9:33

That's great. I knew there would be a way to do it. The reflection namespace was what I was looking for.

I'm not worried about memory resident assemblies as they will be unloaded rather quickly, so loading the Assembly via the Load call appears it will give me what I need. Thanks a lot for your quick responses. And these Reynolds people say you Microsoft guys aren't nice to work with... <sarcasm>

Re: Late binding to objects...

Eric Gunnerson (msft)30-Jul-02 9:49

Eric Gunnerson (msft)

30-Jul-02 9:49

If you don't have the unload/reload issue, it's a *whole* lot easier to avoid appdomains, put the add-in in the same directory as the exe (or a subdir under it), and just use assembly.Load().

The way appdomains work takes a bit of mind-warping to figure out. It's really like running a process on another machine, from the way you deal with things.

Re: Late binding to objects...

leppie31-Jul-02 2:12

leppie

31-Jul-02 2:12

Eric Gunnerson (msft) wrote:
The way appdomains work takes a bit of mind-warping to figure out.

Hi Eric, i have had my mind warped already (partially) Smile | :)

I understand from your article how to use objects from remote domains in the main app domain, but how does it work the other way around?

Eg. You have main program with an object say A. In my case object A also contains a NetworkStream that should not be disconnected. I want to now load/unload "helper" assmeblies in a remote domain that can reference an instance of object A in the main app. Can this be done, without me landing up in a psychiatric ward? Eek! | :eek:

Reading both parts of the graphing calculator article was already a great help, i cant find any examples on how to do the reverse as described above.

Thanking you in advance

Cheers

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Re: Late binding to objects...

Eric Gunnerson (msft)31-Jul-02 6:48

Eric Gunnerson (msft)

31-Jul-02 6:48

I think the way you'd do this would be to pass a MarshalByReference object as a parameter to the other app domain when you made a call. That should result in the other app domain having a proxy object to the object in the main app domain.

I haven't tried this, however.

Why does OleDbDataAdaptor do this?

Zombies with Coffee, LLC30-Jul-02 5:51

Zombies with Coffee, LLC

30-Jul-02 5:51

Really curious why the 'where' statements that the OleDbDataAdaptors creates are excessively wordy...

What are they trying to accomplish here? Do automatic code creators get paid by the line? What is the point of the extra 250 lines of code?

Wouldn't just WHERE (CustomerID=?) work just fine?
WTF | :WTF:

this.oleDbDeleteCommand1.CommandText = @"DELETE FROM Customers WHERE (CustomerID = ?) AND (Address = ? OR ? IS NULL AND Address IS NULL) AND (City = ? OR ? IS NULL AND City IS NULL) AND (CompanyName = ?) AND (ContactName = ? OR ? IS NULL AND ContactName IS NULL) AND (ContactTitle = ? OR ? IS NULL AND ContactTitle IS NULL) AND (Country = ? OR ? IS NULL AND Country IS NULL) AND (Fax = ? OR ? IS NULL AND Fax IS NULL) AND (Phone = ? OR ? IS NULL AND Phone IS NULL) AND (PostalCode = ? OR ? IS NULL AND PostalCode IS NULL) AND (Region = ? OR ? IS NULL AND Region IS NULL)";<br />

And the parameter list...

this.oleDbDeleteCommand1.Parameters.Add(new System.Data.OleDb.OleDbParameter("Original_Address", System.Data.OleDb.OleDbType.VarWChar, 60, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "Address", System.Data.DataRowVersion.Original, null));<br />
this.oleDbDeleteCommand1.Parameters.Add(new System.Data.OleDb.OleDbParameter("Original_Address1", System.Data.OleDb.OleDbType.VarWChar, 60, System.Data.ParameterDirection.Input, false, ((System.Byte)(0)), ((System.Byte)(0)), "Address", System.Data.DataRowVersion.Original, null));<br />
<br />
... x 10 times more

Re: Why does OleDbDataAdaptor do this?

Zombies with Coffee, LLC30-Jul-02 6:18

Zombies with Coffee, LLC

30-Jul-02 6:18

Ahhh... Optimistic Concurrency. Nevermind.

implicit cast

Christian Graus30-Jul-02 4:23

Christian Graus

30-Jul-02 4:23

Is it possible to create a class, call it a, and make it implicity accept a reasonable cast, for example

string s = MyA;

???

I was thinking of writing a class called ConstString, for example, passing a string into the constructor, and then having it return the string when the object was used as a string. So I could do this

public void MyFunc (ConstString s)

and call it like this

MyFunc(ConstString(myString));

Oh, and if anyone reading has an answer to my XmlTextWriter problem from yesterday, it's still driving me mad.....

Thanks.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Re: implicit cast

Nish Nishant30-Jul-02 5:23

Nish Nishant

30-Jul-02 5:23

Christian Graus wrote:
Is it possible to create a class, call it a, and make it implicity accept a reasonable cast, for example

string s = MyA;

???

using System;

class Nish
{
	public static void Main()
	{
		string s = new Nish("Christian Graus");
		Console.WriteLine(s);
	}

	public Nish(string s)
	{
		m_s = s;
	}

	public static implicit operator string(Nish a)
	{
		return a.m_s;
	}
	private string m_s;
}

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

Re: implicit cast

Christian Graus30-Jul-02 12:27

Christian Graus

30-Jul-02 12:27

Thanks - looks like I win and C# loses. It's such a shame to find myself fighting the language.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

Re: implicit cast

James T. Johnson30-Jul-02 16:22

James T. Johnson

30-Jul-02 16:22

You don't need to do that for a string object. strings are immutable so no changes can be made to it.

All methods on string that would do any modification return a new string object containing the changes.

James
"Java is free - and worth every penny." - Christian Graus

Re: implicit cast

Christian Graus30-Jul-02 17:17

Christian Graus

30-Jul-02 17:17

Thanks - I know that, I just wrote the first example that sprang to mind. The object I actually want to pass is an XmlNode, and I dunno that this will help, because once I get back the node, I can still call methods on it that change it.

Christian

We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum )

DLL Hell

gekoscan30-Jul-02 2:38

gekoscan

30-Jul-02 2:38

I am trying to use a library file that I created in MFC Visual C++. It
won't let me include it as a reference so I am assuming I need to do
something like this:

[DllImport("MyDLL.dll")]
private static extern bool Counter(out long lpCount);

However I don't just wanna import a method I wanna make an instance of the
class which is called CAppBar. Can anyone point me in the write direction
here? It would be a huge help thanks...

Big Grin | :-D

Re: DLL Hell

Eric Gunnerson (msft)30-Jul-02 8:48

Eric Gunnerson (msft)

30-Jul-02 8:48

P/Invoke only lets you hook up to static functions; you can't create C++ instances, as the CLR and C++ rules for how classes work are quite a bit different.

To do this, you'd need to wrap it using the Managed Extensions to C++.

Putting bitmap to RTF

tomiga29-Jul-02 20:59

tomiga

29-Jul-02 20:59

Welcome,
Have you got any example how to put Bitmap (created during working of application) and than put it (embedded) in RichTextBox control.
Bitmap is created in the memory (not reading from file).

thx

Re: Putting bitmap to RTF

leppie30-Jul-02 0:52

leppie

30-Jul-02 0:52

Hi
I have tried to do something similar and there seems to be 2 ways:

1. Easy - place bitmap object in clipboard and paste to richtextbox. Problem that u use the clipboard and mite "lose" data that still needs to be there.

2. Hard - Create a RTF file in a word processor with required bitmap, save the file. Now add that to the Rtf of the richtextbox. This could coause many problems though Frown | :(

3. Ideal solution - Every stick together and make a proper WordProcessingTextBox with all the features we always wanted Smile | :)

. Like highlighting Smile | :)

Hope this helps

MYrc : A .NET IRC client with C# Plugin Capabilities. See
http://sourceforge.net/projects/myrc for more info. Big Grin | :-D

Re: Putting bitmap to RTF

tomiga30-Jul-02 1:08

tomiga

30-Jul-02 1:08

leppie wrote:
Hi

I have tried to do something similar and there seems to be 2 ways:

1. Easy - place bitmap object in clipboard and paste to richtextbox. Problem that u use the clipboard and mite "lose" data that still needs to be there.

Hmm I did't think about it... but how to copy bitmap from Form (for example I would like to write some kind of chart and put it into rtf)

leppie wrote:
2. Hard - Create a RTF file in a word processor with required bitmap, save the file. Now add that to the Rtf of the richtextbox. This could coause many problems though

In my case it couldn't be done.

leppie wrote:
3. Ideal solution - Every stick together and make a proper WordProcessingTextBox with all the features we always wanted . Like highlighting

That's cool. But unfortunately I don't have time to do it Frown | :(

(but maybe in future it is good idea Smile | :)

Data modules

Harilaos Sfougaris29-Jul-02 19:39

Harilaos Sfougaris

29-Jul-02 19:39

I am looking for something similar to a feature Delphi has, that allows you to
- create a "Data Module"
- add database components (connections, tables, views)
- use the data module in any form (it works with the visual tools too).
I can't seem to find anything similar for a Windows Forms C# application.

What I would like to do, is have one database connection always open, and available to any form.
It's quite trivial to do it in code, but how can you make the visual designer tools "see" this connection?

Is there some body who is familiar with .vsz file?

Feng Qin29-Jul-02 17:01

Feng Qin

29-Jul-02 17:01

I try to write a .vsz file, but when I use it in vs.net, vs.net always told me "Could not run xxx.vsz file"!

I'm amumu, and you?

.NET Framework Version

Jamie Nordmeyer29-Jul-02 12:57

Jamie Nordmeyer

29-Jul-02 12:57

How do I detect, at runtime, what the .NET Framework Version is?

Jamie Nordmeyer
Portland, Oregon, USA

Re: .NET Framework Version

Feng Qin29-Jul-02 17:19

Feng Qin

29-Jul-02 17:19

System.Version

I'm amumu, and you?

Re: .NET Framework Version

James T. Johnson29-Jul-02 20:21

James T. Johnson

29-Jul-02 20:21

System.Version is a class that represents a version number; by itself it doesn't tell you the version number of the framework but System.Environment.Version will tell you the version of the CLR.

James
"Java is free - and worth every penny." - Christian Graus

Re: .NET Framework Version

Jamie Nordmeyer30-Jul-02 6:16

Jamie Nordmeyer

30-Jul-02 6:16

Hey, thanks for the reply, James. Apparently, though, the .NET Framework Version is not the same as the script directory that ASP.NET uses. What I mean, is that System.Environment.Version returns 1.0.3705.209, but the ASP.NET script files (WebUIValidation.js, etc.) are in a folder called 1_0_3705_272. Ideally, I'd like to be able to get this folder without having to enumerate its siblings, and look for the highest revision number.

Jamie Nordmeyer
Portland, Oregon, USA

Re: .NET Framework Version

Andy Smith30-Jul-02 8:36

Andy Smith

30-Jul-02 8:36

why are you trying to muck around with the asp.net script files?

Re: .NET Framework Version

Jamie Nordmeyer30-Jul-02 8:40

Jamie Nordmeyer

30-Jul-02 8:40

I'm not trying to modify them or anything. I created a custom validator (that implements IValidator, but doesn't derive from BaseValidator), and was hoping I could just use the available script for client side validation, rather than have to rewrite my own.

Jamie Nordmeyer
Portland, Oregon, USA

Re: .NET Framework Version

Andy Smith30-Jul-02 10:47

Andy Smith

30-Jul-02 10:47

BaseValidator gets the path to the script files from the internal static System.Web.UI.Util.GetScriptLocation method, which gets some of its info from the internal System.Web.Util.VersionInfo.SystemWebVersion property.

GetScriptLocation looks up the "clientScriptsLocation" setting in the machine.config file. but that string has parameters which are filled in by SystemWebVersion.

You might be best off either using reflection to get to the GetScriptLocation method, or querying the .config file for the root path, and then scanning that folder for the highest version.

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