First of all you have to implement a TypeConverter for your TestClass and use the TypeConverter-Attribute on the TestClass as well (please use the string overload instead of the typeof() version of that attribute). When persisting the TestClass, the TypeConverter will be used to create a string representation of its value. To create a new TestClass from that representation when loading it is used too. For an example take a look at the DynamicProperty-CollectionTypeConverter.cs file from the JaDAL source code.

Now the values will be stored in the file when saving the DSL model but there is still a problem when loading the file: the class TestClass is not known by the DynamicProperty system and cannot be created. One solution is, to add your TestClass to the JaDAL assembly (or take the DynamicProperty code into your DSL assembly).

Another solution is to change the code saving the TestClass to use the AssemblyQualifiedName instead of the namespace + class name. Now the TestClass can be created but if you change the version or public key of your assembly, old files cannot longer be loaded (since the public key and the version are part of the AssemblyQualifiedName). If you prefer that solution, you have to change the source code of JaDAL a little bit: In the DynamicPropertyCollectionTypeConverter class there is a line
> attr = new XAttribute(“type_” + i, property.Type.ToString());
change it to
> attr = new XAttribute(“type_” + i, property.Type.AssemblyQualifiedName);
Maybe you should add an if statement to use the first way for classes from mscorelib and from the JaDAL assembly and use the second way only for your own classes.

If you have some more questions, do not hesitate to write me an email or a comment on the blog.

I have some query about how to provide external Type as Type in AddProperty() method

DynamicPropertyCollection dpc=new DynamicPropertyCollection ();

dpc.Addproperty(“test”,typeof(TestClass), new TestClass())

when I close visual studio and open next time It never persist its value
but It work with string,Int,bool, Datetime object
Is there any solution for this scenario.

Thank You