Assembly.LoadFr om() fails

[Michael Maes]

Hello,

I want to be able to load an assembly by selecting a dll from an OpenFileDialog.
This seems to work, exept when that assembly references "3rd-Party dll's".

Just this simple line:

Dim myAssembly As [Assembly] = [Assembly].LoadFile(FileN ame)

throws the following exception:

System.Reflecti on.ReflectionTy peLoadException : One or more of the types in the assembly unable to load.
at System.Reflecti on.Module.GetTy pesInternal(Sta ckCrawlMark& stackMark)
at System.Reflecti on.Assembly.Get Types()
at Stegosoft.Assem blySniffer.Form 1.ScanAssembly( String FileName) in ........

Any sugestions?

TIA,
Michael

[One Handed Man \( OHM - Terry Burns \)]

Are these 3rd party dll's .NET assemblies ?

--

OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me

Time flies when you don't know what you're doing

"Michael Maes" <mi*****@merlot .com> wrote in message news:eE******** ******@TK2MSFTN GP11.phx.gbl...
Hello,

I want to be able to load an assembly by selecting a dll from an OpenFileDialog.
This seems to work, exept when that assembly references "3rd-Party dll's".

Just this simple line:

Dim myAssembly As [Assembly] = [Assembly].LoadFile(FileN ame)

throws the following exception:

System.Reflecti on.ReflectionTy peLoadException : One or more of the types in the assembly unable to load.
at System.Reflecti on.Module.GetTy pesInternal(Sta ckCrawlMark& stackMark)
at System.Reflecti on.Assembly.Get Types()
at Stegosoft.Assem blySniffer.Form 1.ScanAssembly( String FileName) in ........

Any sugestions?

TIA,
Michael

[Peter Huang]

Hi Michael,

Can you use the 3rd-party assembly by referencing them directly instead of
using them by reflection?
Also the 3rd-party assembly may need some dependent module which may cause
the problem.
You may try to use the Fuslogvw.exe tool to see if there is any fusion
error during the assembly binding.
Assembly Binding Log Viewer (Fuslogvw.exe)
http://msdn.microsoft.com/library/de...us/cptools/htm
l/cpgrfFusionLogV iewerFuslogvwex e.asp
Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

[Michael Maes]

Hi Terry,

Yes, this happens when a Janus System (v2) Assembly gets involved.
The only thing I want to obtain is scan (a lot) of assemblies to draw an "Object Model".
Lutz Roeder's .NET Reflector can load the assemblies so I guess I'm using the wrong approach....

Regards,

Michael
"One Handed Man ( OHM - Terry Burns )" <news.microsoft .com> wrote in message news:uZ******** ******@TK2MSFTN GP12.phx.gbl...
Are these 3rd party dll's .NET assemblies ?

--

OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me

Time flies when you don't know what you're doing

[Michael Maes]

Hi Peter,

I feel like "an idiot" here...
I've got the tool running, but how do I load an assembly into it?

I guess this is going to be a "blue monday" for me.

B.T.W.: Lutz Roeder's .NET Reflector can load the assemblies so I guess I'm
using the wrong approach....

Regards,

Michael

[Peter Huang]

Hi Michael,

To use the tool, we may just run the Fuslogvw.exe, which will show us the
assembly binding information.
You may try to follow the steps in the link below.
Assembly Binding Log Viewer (Fuslogvw.exe)
http://msdn.microsoft.com/library/de...us/cptools/htm
l/cpgrfFusionLogV iewerFuslogvwex e.asp
You may pay attention to the Other Configuration Settings section.

Also you may try to use the LoadFrom or Load method to see if that help you.
http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfsystemrefl ectionassemblyc lassloadtopic3. asp
http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfSystemRefl ectionAssemblyC lassLoadFromTop ic.asp

Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

[Michael Maes]

Hi Peter,

Indeed the SatteliteDll's don't get loaded.
These are assemblies from which the assembly being scanned is a subclass.

EG:

Assembly A (Parent) & Assembly B (Child)
B inherits from A
If I scan B the LoadFrom-Method fails. (ReflectionType LoadException: One or more of the types in the assembly unable to load.)
If I scan A it works fine.

So I guess the LoadFrom-Method doesn't load the SatteliteAssemb lies.

Since it can load the Parent-Assembly directly, I don't understand why it can't load it through the derived Assembly.

Any further suggestions?

Thanks,
Michael

[Andre]

Reflector does not use System.Reflecti on. Reflector uses it's own
infrastructure for reading assembly files at the binary level (look at
the Reflector.CodeM odel namespace). That might explain why your file
loads in Reflector but not using Assembly.LoadFr om().

[Peter Huang]

Hi Michael,

Based on my test, it seems that if the inherited class in not in the same
assembly of parent class, we can load the assembly.
Here is my test result.
[ParentClass]
Public Class PC
Public mem As Integer
Public Sub New()
mem = 1
End Sub
Public Sub Test()
Console.WriteLi ne(mem)
End Sub
End Class

[ChildrenClass]
Public Class ChildClass
Inherits ParentClass.PC
Public Sub New()
Me.mem = 2
End Sub
Public Sub T()
Me.Test()
End Sub
End Class

Imports System.Reflecti on
Module Module1
Sub Main()
Dim ass As [Assembly] =
[Assembly].LoadFrom("<pat h>\ChildrenClas s.dll")
Dim t As Type = ass.GetType("Ch ildrenClass.Chi ldClass")
Dim o As Object = Activator.Creat eInstance(t,
BindingFlags.Cr eateInstance, Nothing, New Object() {}, Nothing, Nothing)
t.InvokeMember( "T", BindingFlags.In vokeMethod, Nothing, o, New
Object() {}, Nothing, Nothing, Nothing)
End Sub
End Module

You may try the code above to see if that help you.

As for your scnario, can you send me the a simple reproduce sample by
removing the "Online" from my email address with detailed reproduce steps.
Also have you tried my suggestion that use the load method instead, did
that work for you?

Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.

[Peter Huang]

Hi Michael,

It seems that the problem is caused by the difference between loadfile and
loadfrom. For this scenario, the loadfrom will be a proper method.
Remarks
Use the LoadFile method to load and examine assemblies that have the same
identity, but are located in different paths. Do not use LoadFile to load
assemblies that you want to execute. LoadFile does not load files into the
LoadFrom context, and does not resolve dependencies using the load path, as
the LoadFrom method does. LoadFile is useful in this limited scenario
because LoadFrom cannot be used to load assemblies that have the same
identities but different paths; it will load only the first such assembly.

http://msdn.microsoft.com/library/de...us/cpref/html/
frlrfsystemrefl ectionassemblyc lassloadfiletop ic1.asp

If we change the loadfile to loadfrom in your reproduce sample, it will
solve the problem, you may have a try and let me know the result.

Best regards,

Peter Huang
Microsoft Online Partner Support

Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.