I case people don't want to go to the other group. Here is what I am trying
to accomplish.
I have an assembly that is dynamically created at runtime using
Mono.CSharp. The assembly contains the POCOs as well as the Class Mappings.
I have a default class that I instantiate from the assembly in order to get
at its assembly name and type information. I then proceed to create my
session factory using the type information in the dynamic assembly to
create the class mappings. It fails with the following error message:
"Could not load file or assembly 'eval-3' or one of its dependencies. The
system cannot find the file specified." It appears that the assembly is
trying to be loaded from the drive, but it does not exist on the drive,
only in memory.
Another gentleman, named Randy Burden, suggested that I try to use
AppDomain.ResolveAssembly. However, it too fails with the following
exception: "Resolving to a collectible assembly is not supported."
This error is generated by the call to System.Type type = System.Type.
GetType(name.ToString()); in the ReflectHelper.cs file on line 267. It
appears that the assembly generated using Mono.CSharp is a collectible
assembly. The documentation for System.Type.GetType does mention that it
doesn't work with dynamically loaded assemblies.
Updating the ReflectHelper.cs TypeFromAssembly method as follows fixes the
issue.
public static System.Type TypeFromAssembly(AssemblyQualifiedTypeName name,
bool throwOnError)
{
try
{
// Try to get the type from an already loaded assembly
System.Type type = System.Type.GetType(name.ToString());
if (type != null)
{
return type;
}
if (name.Assembly == null)
{
// No assembly was specified for the type, so just fail
string message = "Could not load type " + name + ". Possible cause: no
assembly name specified.";
log.Warn(message);
if (throwOnError) throw new TypeLoadException(message);
return null;
}
// See if the assembly is already loaded in the current AppDomain.
var loadedAssemblies = AppDomain.CurrentDomain.GetAssemblies();
Assembly assembly = null;
foreach (var loadedAssembly in loadedAssemblies)
{
var assemblyName = new AssemblyName(loadedAssembly.FullName);
if (loadedAssembly.FullName == name.Assembly || assemblyName.Name ==
name.Assembly)
{
assembly = loadedAssembly;
}
}
if(assembly == null)
{
assembly = Assembly.Load(name.Assembly);
if (assembly == null)
{
log.Warn("Could not load type " + name + ". Possible cause: incorrect
assembly name specified.");
return null;
}
}
type = assembly.GetType(name.Type, throwOnError);
if (type == null)
{
log.Warn("Could not load type " + name + ".");
return null;
}
return type;
}
catch (Exception e)
{
if (log.IsErrorEnabled)
{
log.Error("Could not load type " + name + ".", e);
}
if (throwOnError) throw;
return null;
}
}
My questions are as follows...
1. Can anyone thinl of a different approach that I am overlooking?
2. If not, what is the best approach to getting this into NHibernate trunk?
I did already fork the "nhibernate-core" project on Github and I am in the
process of writing a unit test that shows the issue.
3. Should I generate an issue on the bug tracker?
I am not sure what the best practices are with regards to resolving issues
with or requesting features to NHibernate. Perhaps I overlooked a document
that explains the process?
Once again, thanks in advance for any feedback.
Leo
On Wednesday, February 6, 2013 9:16:39 AM UTC-7, Leo Duran wrote:
>
> I started a thread on the nhusers group about an issue I am having with
> dynamic assemblies. I figured that instead of retyping the information
> here, I would just link to the thread in the other group.
>
> https://groups.google.com/forum/#!topic/nhusers/21O2_5pumjE
>
> Does anyone here have any feedback?
>
> Thanks in advance.
>
> Leo
>
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