Calling COM from ASP.NET

[Sid]

Is it possible to call compiled COM components directly
from ASP.NET without having to set a reference to them
using the IDE?

e.g. in ASP you could use Server.CreateObject("somedll")
but for some reason this does not work in ASP.NET, is this
actually possible?

 

[Cowboy \(Gregory A. Beamer\)]

The reference is necessary, as you have to create the .NET callable wrapper
for the COM component. There is interop involved when you go across the
COM/.NET barrier.

--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA

**********************************************************************
Think Outside the Box!
**********************************************************************

 

[Sid]

Thanks for replying, can I just clarify, if I am therefore
writing ASP.NET pages using notepad, then I am unable to
call COM components that I have previously created in VB
6.0? Or is it possible to set a reference to a dll
programmatically?

 

[David Browne]

Thanks for replying, can I just clarify, if I am therefore
writing ASP.NET pages using notepad, then I am unable to
call COM components that I have previously created in VB
6.0? Or is it possible to set a reference to a dll
programmatically?

First off, you don't need an interop assembly.

If you are using VB, at least, you can just use CreateObject and late
binding.

Dim d As Object = CreateObject("MyComponent.MyClass")
d.DoSomething()

This will use late binding to access the component, just like in classic
ASP.

If you want to early-bind to the component, you do need an interop assembly.
But you still don't need VS. You can use tlbimp.exe to generate the interop
assembly, and then add a directive to your aspx page to reference it.

David

 

[Ingrid]

David you saved my day with this mail, thanks !
Ingrid