Add dynamic objects to EF and querying them. RRS feed

  • Question

  • I create a dynamic object using typebuilder in a runtime compiled assembly.

    I save the assembly and load it from disk.

    Then I add this assembly to a dictionary and give that to a custom DBContext that uses the assembly to create the Entitytpes.

    But now I would like to add/query entities of this dynamic type.

    Everything works (the database table is nicely created) except the dbSet.Add(), then it tells me that I cannot add test.foo because it expects a test.foo. In reflector I see that somewhere inside the test obs is TEntity fails.

    Is what I am trying to do at all possible?



    //Create the assemblyDynamicEFactory factory =newDynamicEFactory("test");             //Define the entity classDictionary<StringType> entity1 =newDictionary<stringType>();             entity1.Add("Id"typeof(String));             entity1.Add("Property1"typeof(Decimal));             entity1.Add("Property2"typeof(Double));             entity1.Add("Property3"typeof(int));             Type newtype = factory.CreateDynamicType<DynamicEFEntity>("foo", entity1);             if (File.Exists(@"D:\Development\downloads\WindowsFormsApplication\bin\Debug\test.dll"))             {                 File.Delete(@"D:\Development\downloads\WindowsFormsApplication\bin\Debug\test.dll");             }             factory.SaveAssembly();             Dictionary<StringAssembly> assemblies =new Dictionary<stringAssembly>();             Assembly assembly = Assembly.LoadFile(@"D:\Development\downloads\EntityMapper\WindowsFormsApplication1\bin\Debug\test.dll");             assemblies.Add("test", assembly);             var context =new DynamicDbContext(assemblies);

                context.Database.Initialize(true); //If set to true the initializer is run even if it has already been run.       DbSet dbSet = context.Set(newtype);

    	  DbSet dbSet = context.Set(newtype);

                var obj = assembly.CreateInstance(dbSet.ElementType.ToString());             dbSet.Add(obj);


    protected override void OnModelCreating(DbModelBuilder modelBuilder)
        foreach (Assembly asbly in _assemblies.Values)
            foreach (Type type in asbly.GetExportedTypes())
                if (type.IsClass)
                    MethodInfo method = modelBuilder.GetType().GetMethod("Entity");
                    method = method.MakeGenericMethod(new Type[] { type });
                    method.Invoke(modelBuilder, null);

    Sunday, June 12, 2016 7:04 PM

All replies

  • Hi Ben Geerdes,

    Could you please provide complete code and error message, which we could reproduce your issue on our side. we will try to find a solution to resolve it.

    Best regards,

    Cole Wu

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    Monday, June 13, 2016 1:49 PM