Referencing .net class (Late Binding)

I have a c# project that references a com object. The com object can only be installed on one computer. I want to deploy the project on many computers.
Normally I would have used CreateObject on a switch.
// e.g. 
if (GetSetting("Connect")){
 
   mobjConnect = //CreateObject("My.Class");
}

Open in new window

ClearRockAsked:
Who is Participating?

Improve company productivity with a Business Account.Sign Up

x
Advertise Here
 
CodeCruiserConnect With a Mentor Commented:
According to MSDN, CreateInstance can be used to create instances of .NET types. In the following example, createinstance is being used to create object of type StringBuilder which is a .NET type.

http://msdn.microsoft.com/en-us/library/wccyzw83.aspx

There may be some other problem such as no default constructor in the class.
0
 
CodeCruiserCommented:
0
 
ClearRockAuthor Commented:
Thanks ... seems a bit complicated
I've been looking at 'System.Activator - Activator.CreateInstance(type As System.Type)' which is the eq of create instance. Is there a similar one for .net dlls save having to reference etc...

Create instance appears not to like my .net dll but does like good old com dlls (Word);
John
0
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Access It Instantly
 
ClearRockAuthor Commented:
obviously more complicated than i thought
See the code below...
Thanks for the help...
//Fine
object cpay = Activator.CreateInstance("SIM", "CPayroll");
//object cpay = Activator.CreateInstance(Type.GetTypeFromProgID("SIM.CPayroll"));
//OK (as expected)
//CPayroll cpay = new CPayroll();
//Compile Error --- 'object' does not contain a definition for 'SetPerson'
cpay.SetPerson(sNiNumber, sTitle, sFirst, sLast, dteDOB,sAddress1,sAddress2, sAddress3, sAddress4, sAddress5, sPostCode,
dteDateStarted, IsMale, sInitials, IsMarried, sEmail,sNiNumber, sHomePhone,sOtherHomePhone, sMobilePhone,sOtherMobilePhone);

Open in new window

0
 
CodeCruiserCommented:
"This method is provided for COM support. ProgIDs are not used in theMicrosoft .NET Framework because they have been superseded by theconcept of namespace.This method is provided for COM support. ProgIDs are not used in the Microsoft .NET Framework because they have been superseded by the concept of namespace."

This is what Microsoft says about GetTypeFromProgID. Is the type a .NET class? Then try this
GetType(Sim.CPayroll) (VB!)
0
 
CodeCruiserCommented:
Microsoft said it only once!
0
 
ClearRockAuthor Commented:
Hi CodeCruiser

My prob is not the specific really but the general. In the old days (a long time ago) I used to be able to late bind an object (CreateObject) dependant on it being there. I have my interface to SIM in a seperate assembly all working and nice, but it depends entirely on SIM being installed as SIM costs a lot it is only installed on some m/cs. I want to be able to deploy my lot so it works whether or not SIM is installed (and later will pick up SIM if it gets installed). I'm not that bothered in what .net 3.5 no longer does but rather what it could do. It would seem to me that I could instantiate my sim object and then use it as an object rather than a type. If that is not possible then I'll skin the cat another way.
e.g. within a functon....
1 Instantiate the assembly + class with the current code knowing nothing about its existance (not referenced)
2 Use the functions in the class
3 Ditch it
I check wether the installation of SIM is present and run or block the function accordingly (Actually blocking the menu at the moment).

If I reference the class and it cannot see SIM the whole thing pours out errors which is not so nice in front of customers!

If you have a good option I'd be gratefull, otherwise time suggests taking another route.

Thanks
John
0
 
CodeCruiserCommented:
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.