In that example, the mapping file is telling NH to set the Id property using the field (in this case "id") You have a private accessor in the Id property, and you are not declaring a private field behind it "id" so NH doesn't know how to set that "Id" property.
You need to tell NH how to access that property when it builds the proxy. Check here for the specific documentation: http://nhforge.org/doc/nh/en/index.html#mapping-declaration-property In your example, the easiest solution would probably be to make that private setter protected. That way the proxy will inherit the ability to set the value of Id. Also, I took a look at that tutorial and it really sets up some poor practices (public lowercase fields, for one). Try this one instead: http://nhforge.org/doc/nh/en/index.html#quickstart-intro hth, -devon On Jan 18, 4:22 pm, niberhate <[email protected]> wrote: > I had put this mistakenly in the development group and was asked to > ask in this group. So here it goes. > > I am playing with the HelloNHibernate example of NHibernate In > Action. The source code can be downloaded > fromhttp://www.manning.com/kuate/NHibernateInAction.Source.zip > > You will find an example solution called "1. Simple Example - Helllo > NHibernate" in that zip package. > > Because the objective of that example is to have the minimum working > solution of NHibernate, it has public fields instead of private. The > fields are Id, Name and Manager (I use PascalStyle for naming > convention, so I capitalized the initial characters of these fields.) > > So, I changed the public fields into public auto properties, and then > the following method throws and exception at c.AddAssembly > (Assembly.GetCallingAssembly()); > > static ISession OpenSession() > { > if (factory == null) > { > Configuration c = new Configuration(); > c.AddAssembly(Assembly.GetCallingAssembly()); > factory = c.BuildSessionFactory(); > } > return factory.OpenSession(); > } > > The exception says: > > {"Could not compile the mapping document: > HelloNHibernate.HelloNHibernate.Employee.hbm.xml"} > > And the inner exception says: > > {"Problem trying to set property type by reflection"} > > In other words, everything else being the same, the following works: > > namespace HelloNHibernate > { > class Employee > { > public int Id; > public string Name; > public Employee Manager; > > public string SayHello() > { > return string.Format( > "'Hello World!', said {0}.", Name); > } > } > > } > > Whereas the following fails: > > namespace HelloNHibernate > { > class Employee > { > public int Id { get; private set; } > public string Name { get; set; } > public Employee Manager { get; set; } > > public string SayHello() > { > return string.Format( > "'Hello World!', said {0}.", Name); > } > } > > } > > What is the caveat? Does NHibernate have any special configuration > requirement for auto properties to work? Any idea? Thanks.
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