how to Identify a type in an assembly ????

  • Thread starter Thread starter serge calderara
  • Start date Start date
S

serge calderara

Dear all,

I need to be sure that a loaded assembly is implementing a
particular interface.

How can I do that as long as my assembly is loaded and I
have the assemlby object available in current domain as
follow:

Dim ass As System.Reflection.Assembly
Dim loadass As System.Reflection.Assembly
loadass = ass.LoadFrom(sFile)

thanks for your help
regards

calderara serge
maillefer s.a
 
I need to be sure that a loaded assembly is implementing a
particular interface.
Click to expand...

Assemblies don't implement interfaces, types do.

Dim ass As System.Reflection.Assembly
Dim loadass As System.Reflection.Assembly
loadass = ass.LoadFrom(sFile)
Click to expand...

You don't need to declare a variable (ass) to call Shared methods such
as Load. You can simply do

loadass = System.Reflection.Assembly.LoadFrom(sFile)

You can get all types in the assembly with Assembly.GetTypes(), and
check each if it implements a certain interface with
Type.IsAssignableFrom().



Mattias
 
I have try what you suggest like :

loadass = System.Reflection.Assembly.LoadFrom(sFile)
then geting the types by :

dim obj() as type
obj=loadass.getTypes()

then I get an error saying that all types cannot be loaded ?

whats that ?

thanks for your information
serge
 
Hello,

I have tried to retrieve all interface defines in an assembly as follow
:

objType = ass.GetType()
t = objType.GetInterfaces

The assembly is one that I have created and when using GetInterfaces
methode I retrive interface of the assembly but only the system
reflexion runtime interface. It cannot retrives my own interface that I
include in assembly by implements keywords.

how to retrive my own interface ?

thnaks for your help
regards
serge
 
As has been pointed out previously, assemblies don't implement interfaces. Your
assembly might have dozens of classes in it, and some of those might implement
your interface, so I suspect what you want to do is enumerate the Types in the
assembly that are classes, and then see if those classes implement your
interface.
 
Hello,

I have tried as you mentionned to get the type with
ass.GetTypes. It was for working fin for a while and since
today without having change any thing in my code I get an
error when executing the ass.GetTypes saying :

"One or more of the types in the assembly unable to load."

What does it means and why it hapens now ?
any iadeas?

thnaks for your help
regards
serge
 
"One or more of the types in the assembly unable to load."

What does it means and why it hapens now ?
any iadeas?
Click to expand...

Serge,

If you catch the exception and take a close look at it (Message,
InnerException and other properties), does it tell you any more about
which type it fails to load?



Mattias
 
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