VB.Net, Creating objects at runtime

Creating objects at runtime

Author	Message
Yazid Arezk #1 / 4	Creating objects at runtime Hello I have an abstract class called Equities and two other classes called Bonds and Mutuals that derive from Equities. I first declare the object of type Equities and when they click on an option button I return an object of type Bonds or Mutuals. I kown this can be achieved using a select case and return an object of type Bonds or Mutuals. If I had ten different types of objects, I think this very ugly select case. Is there another way of achieving this without the select case, in other words given an ID I get a string and then invoke it to create the object with the proper type. TIA Yaz
Thu, 26 Aug 2004 20:40:20 GMT

Kevi #2 / 4	Creating objects at runtime MSDN and the help in VS.NET covers this very tourough, (Don't know the links) It's something in the style of controls.create or controls.add or dim LL as new controls.<control> You'll see, Hope I directed you properly, Kevin C. Quote: > Hello > I have an abstract class called Equities and two other classes called Bonds > and Mutuals that derive from Equities. > I first declare the object of type Equities and when they click on an option > button I return an object of type Bonds or Mutuals. I kown this can be > achieved using a select case and return an object of type Bonds or Mutuals. > If I had ten different types of objects, I think this very ugly select case. > Is there another way of achieving this without the select case, in other > words given an ID I get a string and then invoke it to create the object > with the proper type. > TIA > Yaz
Thu, 26 Aug 2004 23:56:29 GMT

Yazid Arezk #3 / 4	Creating objects at runtime Hello I am answering my own question, this could be achieved using the following: Dim hdlSample As ObjectHandle Dim myExtenderInterface As Equities hdlSample = Activator.CreateInstance("SampleAssembly", "samplenamespace.Bonds", True) myExtenderInterface = CType(hdlSample.Unwrap(), IMyExtenderInterface) Console.WriteLine(myExtenderInterface.SampleMethod("Bill")) Is there a better way. TIA Yaz Quote: > Hello > I have an abstract class called Equities and two other classes called Bonds > and Mutuals that derive from Equities. > I first declare the object of type Equities and when they click on an option > button I return an object of type Bonds or Mutuals. I kown this can be > achieved using a select case and return an object of type Bonds or Mutuals. > If I had ten different types of objects, I think this very ugly select case. > Is there another way of achieving this without the select case, in other > words given an ID I get a string and then invoke it to create the object > with the proper type. > TIA > Yaz
Fri, 27 Aug 2004 00:46:46 GMT

Yazid Arezk #4 / 4	Creating objects at runtime Hello It's me again answering my own question Function CreateObjec(an as string, cn as string) as Equities Dim asm as [Assembly] = [Assembly].Load(an) Dim obj as Object = asm.CreateInstance(cn) Return CType(obj,Equities) End function This would perfomance issues wouldn't it? TIA Yaz Quote: > Hello > I have an abstract class called Equities and two other classes called Bonds > and Mutuals that derive from Equities. > I first declare the object of type Equities and when they click on an option > button I return an object of type Bonds or Mutuals. I kown this can be > achieved using a select case and return an object of type Bonds or Mutuals. > If I had ten different types of objects, I think this very ugly select case. > Is there another way of achieving this without the select case, in other > words given an ID I get a string and then invoke it to create the object > with the proper type. > TIA > Yaz
Fri, 27 Aug 2004 00:58:10 GMT

Page 1 of 1

[ 4 post ]