Unable to cast object of type 'NHibernate.Collection.Set' to type 'System.Collections.IDictionary',

my class was:
Public Class Department
Private _id As Integer
Private _name As String
Private _classes As IDictionary
Private _professor As IDictionary

Public Property id() As Integer
Get
Return _id
End Get
Set(ByVal value As Integer)
_id = value
End Set
End Property

Public Property name() As String
Get
Return _name
End Get
Set(ByVal value As String)
_name = value
End Set
End Property

Public Property classes() As IDictionary
Get
Return _classes
End Get
Set(ByVal value As IDictionary)
_classes = value
End Set
End Property

Public Property professors() As IDictionary
Get
Return _professor
End Get
Set(ByVal value As IDictionary)
_professor = value
End Set
End Property
End Class

when is want to get the data:
Dim depts As IList = session.CreateCriteria(GetType(Department)).List

but the error message out "Unable to cast object of type 'NHibernate.Collection.Set' to type 'System.Collections.IDictionary'"

can anyone help me with this...?

How are you mapping the classes and professors. Does changing IDictionary to Iesi.Collections.ISet make it work.

the mapping file:

<?xml version="1.0" encoding="utf-8" ?>
<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0">
<class name="nhRegistration.Department, nhRegistration" table="Department">
<id name="id" column="DeptID" type="Int32">
<generator class="assigned"></generator>
</id>
<property name="name" column="DeptName" type="String(50)" />

<set name="classes" cascade="all" inverse="true" lazy="false">
<key column="DeptID"/>
<one-to-many class="nhRegistration.UniversityClass, nhRegistration"/>
</set>

<set name="professors" table="DepartmentProfessor" cascade="all" inverse="true" lazy="false">"
<key column="DeptID"/>
<many-to-many class="nhRegistration.Person, nhRegistration" column="PersonID"/>
</set>

</class>
</hibernate-mapping>

how to change IDictionary to Iesi.Collections.ISet ?

just add a reference to Iesi.Collections.dll and include the namespace

using Iesi.Collections;

and then change the declaration from IDictionary to ISet. If you want to instantiate a set use HashedSet class in Iesi.Collections

It should work okay then

Change IDictionary to ISet.

It work!!! thanks....

What can be used instead of Iesi.Collections.ISet ?
I mean is there anything in .NET 2.0 that could be used for a <set> mapping.

Thanks

I'm using Iesi.Collections.ISet to map the <set> </set>

and still have related error:System.InvalidCastException: Specified cast is not valid.




getting data: