Silverlight - Create an intance with Type from a ref assembly

Sometime, we need to create a class with type defined by runtime. These will help.

Below is a  helper class

public static class ReflectionHelper
{
      /// <summary>
      /// Gets a Type of an refed assembly.
      /// </summary>
      /// <param name="assemblyName">FULL Name of the assembly.</param>
      /// <param name="className">FULL Name of the class.</param>
      /// <returns></returns>
      public static Type GetAssemblyType(string assemblyName, string className)
      {
         StreamResourceInfo info = Application.GetResourceStream(new Uri(assemblyName, UriKind.Relative)); 

         Assembly assembly = new AssemblyPart().Load(info.Stream);
         Type type = assembly.GetType(className);
         return type;
      } 

      /// <summary>
      /// Gets A type of An RefFed assembly.
      /// </summary>
      /// <param name="className">FULL Name of the class.</param>
      /// <returns></returns>
      public static Type GetAssemblyType(string className)
      {
         Type type = null; 

         foreach (AssemblyPart part in Deployment.Current.Parts)
         {
            type = GetAssemblyType(part.Source, className); 

            if (type != null)
               break;
         }
         return type;
      }   

}

Next, we use the function

Type loaderType = ReflectionHelper.GetAssemblyType("AssemblyFullName.dll", "AssemblyFullName.ClassName"); 
object obj = Activator.CreateInstance(loaderType);

//my interface 
IToolLoader loader = obj as IToolLoader;

if (loader != null)
{ 

    //use  your interface
}