Assembly.LoadFrom(string) - help!

[Oxymoron]

I am using the code below to load an assembly from a .dll file. Each of the classes contained within are inspected to see if they implement my “IControl” interface.

If they do, I began reflecting them to look at their properties and especially their custom Attributes.

To look at their custom attributes I have to create a Type object passing the AssemblyQualifiedName property as a parameter to the GetType(string) method, because for some reason if i just called GetCustomAttributes() on the typesInAssembly[k] Type object, the if construct inside the foreach...loop would not evaluate to true.

Type[] typesInAssembly = null;

try
{

   Assembly myAssembly = Assembly.LoadFrom(myPluginDLLfiles[i].FullName);

   typesInAssembly = myAssembly.GetTypes();

}
catch (Exception e)
{

   //do something with exception

}

Type tempControl = null;

for (int k=0;k < typesInAssembly.Length;k++)
{

     /*See if any of the Types in the assembly implement the IControl interface*/

      Type anInterface = typesInAssembly[k].GetInterface("IControl");

 

   if ((anInterface != null) && (typesInAssembly[k].IsClass))
   {

      ControlDescriptor currentControlD = new ControlDescriptor(filesInDir[i]); //create new ControlDescriptor

      /*Needs to be a fully qualified assembly name*/

      tempControl = Type.GetType(typesInAssembly[k].AssemblyQualifiedName);  //ASSIGNMENT FAILS!!!!

      ControlAttribute controlAttr = null;
      object[] attributes = tempControl.GetCustomAttributes(false);

      foreach (Attribute attr in attributes)
      {                          
         controlAttr = attr as ControlAttribute;
         if (controlAttr != null)
         {
            /*set ControlDescriptor properties to those reflected from control*/
            currentControlD.Description = controlAttr.ControlDescription;
         }
      }

   }

}

My problem is; The above code works fine on my machine. However, on my colleagues' machines it does not work. I find that the AssemblyQualifiedName property passed in to the GetType(string) method has different version numbers, but don't know why!

I'm afraid I am a newbie at C# and Assemblies, reflection etc.

If anyone could give me any idea why the above code works for me, but not for my colleagues I would be very grateful.
All suggestions appreciated!
Many thanks

Oxy




we are all of us living in the gutter.
But some of us are looking at the stars.

 

[obislavu]

Reflection means the access to metadata.
The access is controlled by the ReflectionPermission class and I think your code should use it to demand the permission to discover and invoke code from other assemblies.
Check on the coleagus machines in Control Panel->Administrative Tool->Microsoft .NET Framework 1.1 Configuration->Run time Security Policy.
Expand the tree and inspect User & Machine ->Permission Sets->Everything ->Reflection permissions.
Check Internet set if your app uses Internet code.
-obislavu-