Reading Registry Data - C# Discussion Boards

Re: Default parameters in C# method

20-Oct-05 12:49

yanshof wrote:
IS there is some way

Yes. I told you there wasn't any way because I wanted to test you.

Actually, there is no way, just like I said Smile | :)

yanshof wrote:
some mail that we [the develop user] can write [by mail] to microsoft ?

I'm sure there are ways to write to Microsoft, and I'm sure they would give it some consideration, but certainly I've put my vote in, in person, as an MVP, I'm not sure that an email on the topic would help more than that, they certainly didn't respond strongly to the suggestion, and nor did any of the C# MVPs present, which left me feeling that there's probably not many who moved from C++ and understand how useful this can be. Certainly, I said that I think C# errs too often on holding the developers hand ( and they may feel that optional parameters can cause coding errors ), and they said that will definately continue to be the case.

Christian Graus - Microsoft MVP - C++

PaulPrice23-Jul-07 9:50

PaulPrice

23-Jul-07 9:50

There is no difference between the two, for example

public foo(bool someVariable)<br />
{<br />
//Call foo with default variable<br />
foo(someVariable, false);<br />
}<br />
public foo(bool someVariable, bool anotherVariable)<br />
{<br />
//do something<br />
}<br />

Optional parameters are not CLS compliant and are therefore not a great idea

Re: Default parameters in C# method

Ali Beirami21-Oct-05 3:00

Ali Beirami

21-Oct-05 3:00

Unfortunatley in .NET Just C# does not support Default parameters.

Catastrophic Error

NET_GEEK20-Oct-05 11:01

NET_GEEK

20-Oct-05 11:01

Hi,

I am trying to develop a web application, and I am using Third Party COM DLL. On running The application it works until the where it initiates class. I have used Tlbimp to create a wrapper too. Also it was suggested to add IWAM_account to the impersonate security policy for local settings. I have update the group policy using force, and also restarted an IIS, but still no luck with it.

Code looks like

<br />
using dllname;<br />

creating object

dllname.obj some = new dllname.obj(); <----- Giving me error here at this line Interop Com Exception catastrophic error.

Any help will be appreciated. Thanks,
Smile | :)

Re: Catastrophic Error

Christian Graus20-Oct-05 12:03

20-Oct-05 12:03

This is a COM error, it means that your dll is running ito an error at initialisation, which I assume means you need to set something else up before you create it.

Christian Graus - Microsoft MVP - C++

Re: Catastrophic Error

NET_GEEK20-Oct-05 17:59

NET_GEEK

20-Oct-05 17:59

Thanks for giving me your insight on this.
I am still not clear how can the same DLL is working with ASP using Server.creta Object. But when I want to use for ASP.net, and I am using the code behind as C#.net I am running to an issue. There got to be a way to solve this problem. However, if you can give me any technical information specifically I can talk to the developer who developed this COM I can talk to him to check. Thanks,

Laugh | :laugh:

Re: Catastrophic Error

Christian Graus23-Oct-05 12:13

Re: Reading Registry Data

23-Oct-05 12:13

I have no idea why it's blowing up. If you can talk to the person who wrote it, perhaps they can help. One possibility is that I think the threading model of ASP.NET is fixed, perhaps the model of the component needs to change. However, I'm taking a stab in the dark. If you have access to the component's author, then definately being able to add some debugging code or otherwise work out where the exception is thrown is a lot more useful than trying to deal with a black box.

Christian Graus - Microsoft MVP - C++

Reading Registry Data

TeamWild20-Oct-05 8:43

TeamWild

20-Oct-05 8:43

I am trying to find out the version numbers of the components that appear in the Add/Remove programs list.

The data I'm after is stored in the registry BUT I don't seem to be able to access it via code but I can view it usingg Regedit.

Below is the code I'm using to try and access the data. As you can see, I've tried setting the access permission but I'm not entirely sure if my implementation is correct.

If I trim the registry path down to "Software\\Microsoft\\Windows" I get a key returned.

Any ideas???

Cheers,
Ben

<code>
/// <summary>
/// Create a registry key object to allow us to retrieve installed components version numbers.
/// </summary>
/// <returns>The registry key to use if no error occured, else null</returns>
private RegistryKey GetRegistryKey()
{
RegistryKey sysSettingsKey = null;

try
{
// Setup permission to ccess the key
RegistryPermission f = new RegistryPermission(PermissionState.Unrestricted);
f.AddPathList(RegistryPermissionAccess.Read,
"HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Uninstall");

// Try and open the key to see if it exists
sysSettingsKey = Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows\\Current Version\\Uninstall");

// Was the key found?
if( sysSettingsKey == null )
{
MessageBox.Show("Unable to access the uninstalll information", "Registry Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
}
catch(Exception ex)
{
MessageBox.Show(string.Format("Exception Detected: \n{0}",ex.ToString()),"Registry Error", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
}
return sysSettingsKey;
}
</code>

-- modified at 14:43 Thursday 20th October, 2005

Christian Graus20-Oct-05 10:40

Re: Reading Registry Data

20-Oct-05 10:40

You're gonna kick yourself.

Wild _Wildy wrote:
sysSettingsKey = Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows\\Current Version\\Uninstall");

This works

Wild _Wildy wrote:
sysSettingsKey = Registry.LocalMachine.OpenSubKey("Software\\Microsoft\\Windows\\Current Version\\Uninstall");

This needs the space between 'Current' and 'Version' removed, so it's the same as the line above, then it works.

Christian Graus - Microsoft MVP - C++

TeamWild20-Oct-05 23:14

TeamWild

20-Oct-05 23:14

Thanks very much.

I didn't quite kick myself (that would just be silly) but I did drink a few beers and have a laugh about the smallest errors being the hardest to find.

I had got the path from Regedit using the "Copy Key Name" menu item so I don't feel like it was my typo.

Thanks again and Cheers. Wink | ;)

split a web service

krism4220-Oct-05 8:27

20-Oct-05 8:27

We have a web service that is growing large enough that we wish to seperate logic. Ideally, we would have multiple code files on the server, and the service itself would still appear to be the same to consumers of it.

If we were doing it in c++, we would simply split the implementation of our WebService class across several .cpp. Of course, we can't do that in C#.

Any ideas or pointers to docs?

Matt Newman20-Oct-05 8:56

Matt Newman

20-Oct-05 8:56

Well, in VS2005/C#2.0 you have partial classes if thats what you mean (spreading the implimentation across files). But I don't see why you couldn't just have the webservice methods call methods in other classes.

^Matt Newman

Even the very best tools in the hands of an idiot will produce something of little or no value. - Chris Meech on Idiots

krism4220-Oct-05 9:02

20-Oct-05 9:02

Another part of it is wanting to group methods by thier function; e.g. multiple webservices in one. So from the WSDL, you'd have

Service1<br />
{ <br />
  func1();<br />
  func2();<br />
}<br />
<br />
Service2<br />
{<br />
  func1();<br />
  func2();<br />
}

Your information about 2005 helps though - that may end up being our solution. Smile | :)

Tom Larsen20-Oct-05 11:20

Tom Larsen

20-Oct-05 11:20

What do you mean "large enough"? Is it too large to maintain on the server or is it too large for any client to handle? Any good enterprise application has multiple layers of implementation to facilitate stuff like this. The exposed web service is just another layer in the API so nothing says it needs to needs to match any actual implementation details. You may have 100 objects that that are needed to make the web service "http://server/service" function but changing any one of them shouldn't change the service definition itself. You should be able to modify any of the 100 objects and not have to modify the interface for the web service. If this isn't happening now then you should rethink about the design. Although partial may help, your team should really be asking themselves do they really need a gigantic object so large it needs to span multiple files?

krism4220-Oct-05 11:23

20-Oct-05 11:23

Most of the logic is in other objects. It's just that this particular .asmx is going to end up being huge and it becomes a pain in the rear to deal with - to add a new function or hunt another down.

Tom Larsen20-Oct-05 11:48

Tom Larsen

20-Oct-05 11:48

Your team should be spliting the web service *anyway* into more managable functional groups. If you are lumping everything into one giant object then it is a poor design that will cause problems down the road because it will grow like a cancer. Changing one large object/web service is trickier than one small one in an API with hundreds of objects. Regression over one large object/web service is more costly than one of many small ones. Resources consumed for one large object/web service is more "brutal" than many small ones. So on and so forth...

Since it seems like a design issue there is no amount of coding or tricks that will help. The fact you are asking how to do break the object into multiple code files seems to indicate you know what is functionally disperate anyway. If you are already considering breaking up a large object into multiple files then why not break the object along those same functional lines?

krism4220-Oct-05 12:31