unload a loaded assembly

[Dominique Vandensteen]

I want to make a program that checks for updates at start...
The way I am doing this is to create 2 projects...

A simple exe checks the server for the version and downloads a dll if
needed.
The dll contains the program itself (so simple a form out of that dll is
started).

My problem is that the exe loads the dll ([Assembly].LoadFrom(..)) and gets
the version of that assembly to find out if an update is needed.
If an update is needed, I need to unload that assembly to be able to
overwrite the previously loaded dll.

Anybody an idea how to do this?


Dominique

 

[Herfried K. Wagner [MVP]]

A simple exe checks the server for the version and downloads a dll if
needed.
The dll contains the program itself (so simple a form out of that dll is
started).

My problem is that the exe loads the dll ([Assembly].LoadFrom(..)) and gets
the version of that assembly to find out if an update is needed.
If an update is needed, I need to unload that assembly to be able to
overwrite the previously loaded dll.

Load the assembly into a separate appdomain and unload the appdomain.

 

[Dominique Vandensteen]

still can't delete the file...
am I doing something wrong?

my code:

dim filename as String = "c:\myfile.dll"
dim filebyte() as Byte = LoadFile(filename)

Dim versionDomain As AppDomain =
AppDomain.CreateDomain("DummyToCheckVersion")
Dim a As [Assembly] = versionDomain.Load(filebytes)
Dim version As Version = a.GetName.Version
AppDomain.Unload(versionDomain)

File.Delete(filename)


the delete fails:
An unhandled exception of type 'System.UnauthorizedAccessException' occurred
in mscorlib.dll
Additional information: Access to the path "c:\myfile.dll" is denied.

A simple exe checks the server for the version and downloads a dll if
needed.
The dll contains the program itself (so simple a form out of that dll is
started).

My problem is that the exe loads the dll ([Assembly].LoadFrom(..)) and gets
the version of that assembly to find out if an update is needed.
If an update is needed, I need to unload that assembly to be able to
overwrite the previously loaded dll.

Load the assembly into a separate appdomain and unload the appdomain.