Jon:
I tried that, as well as everything else, but no go.
The Count method does not exist on the Teahcers object, just on the Teacer
object.
I wondered if there was a problem with the indexer because I'm using this
inside a dropdownlist, but I don't think that is the problem. It may have
more to do with the way that I structured the custom object. Since this is
my first custom object, I definitely don't know what I'm doing.
I'll include the custom object. It's purpose is to has Teachers who have
Classes that in turn have Students.
Any other ideas?
Thanks
---------------------------------------------------------------------------
using System;
using System.Collecti ons;
using System.Xml.Seri alization;//[XmlIgnore] // XmlIgnore is need for
proper nesting of the xml output
namespace Teachers1
{
#region Student
Object+++++++++ +++++++++++++++ +++++++++++++++ +++++++++++++++ ++
[Serializable()]
public class Student
{
#region Private members (Fields) +++++++++++++++ +++++
int id;
string name;
#endregion -------------------------------------------
#region Public Accessors (Properties) ++++++++++++++
[XmlAttribute]
public int Id
{
get { return this.id; }
set { this.id = value; }
}
[XmlAttribute]
public string Name
{
get { return this.name; }
set { this.name = value; }
}
#endregion -------------------------------------------
#region Constructors +++++++++++++++ +++++++++++++++ +++
// Empty constructor
public Student()
{ }
// Constructor 2
public Student(int Id, string Name)
{
this.id = Id;
this.name = Name;
}
#endregion -------------------------------------------
}
#endregion
[Serializable()]
public class Students : CollectionBase
{
#region Indexer +++++++++++++++ +++++++++++++++ +++
public Student this[int index]
{
set
{
List[index] = value;
}
get
{
return (Student)List[index];
}
}
#endregion ------------------------------------
#region Public Methods +++++++++++++++ +++++++++++
public int Add(Student value)
{
return List.Add(value) ;
}
public int IndexOf(Student value)
{
return List.IndexOf(va lue);
}
public void Insert(int index, Student value)
{
List.Insert(ind ex, value);
}
public void Remove(Student value)
{
List.Remove(val ue);
}
public bool Contains(Studen t value)
{
return List.Contains(v alue);
}
#endregion -------------------------------------------
#region Constructors +++++++++++++++ +++++++++++++++ +++
public Students()
{ }
#endregion -------------------------------------------
}
#region Class
Object+++++++++ +++++++++++++++ +++++++++++++++ +++++++++++++++ ++++
[Serializable()]
public class Class
{
#region Private members (Fields) +++++++++++++++ +++++
int id;
string name;
Teachers1.Stude nts students = new Teachers1.Stude nts();
#endregion -------------------------------------------
#region Public Accessors (Properties) ++++++++++++++
[XmlAttribute]
public int Id
{
get { return id; }
set { id = value; }
}
[XmlAttribute]
public string Name
{
get { return name; }
set { name = value; }
}
//[XmlAttribute] can't use on Complex Type
public Teachers1.Stude nts Students
{
get { return this.students; }
set { this.students = value; }
}
#endregion -------------------------------------------
#region Constructors +++++++++++++++ +++++++++++++++ +++
// empty constructor
public Class()
{ }
// Full Constructor
public Class(int Id, string Name, Teachers1.Stude nts
Students)
{
this.id = Id;
this.name = Name;
this.students = Students;
}
#endregion -------------------------------------------
}
#endregion
[Serializable()]
public class Classes : CollectionBase
{
#region Indexer +++++++++++++++ +++++++++++++++ +++
public Class this[int index]
{
set
{
List[index] = value;
}
get
{
return (Class)List[index];
}
}
#endregion ------------------------------------
#region Public Methods +++++++++++++++ +++++++++++
public int Add(Class value)
{
return List.Add(value) ;
}
public int IndexOf(Class value)
{
return List.IndexOf(va lue);
}
public void Insert(int index, Class value)
{
List.Insert(ind ex, value);
}
public void Remove(Class value)
{
List.Remove(val ue);
}
public bool Contains(Class value)
{
return List.Contains(v alue);
}
#endregion -------------------------------------------
#region Constructors +++++++++++++++ +++++++++++++++ +++
public Classes()
{ }
#endregion -------------------------------------------
}
#region Teacher
Object+++++++++ +++++++++++++++ +++++++++++++++ +++++++++++++++ ++
[Serializable()]
public class Teacher
{
#region Private members (Fields) +++++++++++++++ +++++
private int id;
private string name;
Teachers1.Class es classes = new Teachers1.Class es();
#endregion -------------------------------------------
#region Public Accessors (Properties) ++++++++++++++
//[XmlAttribute(At tributeName = "id", Namespace =
"urn:schema s-microsoft-com:xml-updategram")]
[XmlAttribute]
public int Id
{
get { return id; }
set { id = value; }
}
[XmlAttribute]
public string Name
{
get { return name; }
set { name = value; }
}
//[XmlAttribute] can't use on Complex Type
public Teachers1.Class es Classes
{
get { return this.classes; }
set { this.classes = value; }
}
#endregion -------------------------------------------
#region Constructors +++++++++++++++ +++++++++++++++ +++
// Default Constructor
public Teacher()
{ }
// Constructor 2
public Teacher(int id, string Name, Teachers1.Class es
Classes)
{
this.id = Id;
this.name = Name;
this.classes = Classes;
}
#endregion -------------------------------------------
}
#endregion
[Serializable()]
public class Teachers : CollectionBase
{
#region Private members (Fields) +++++++++++++++
#endregion --------------------------------------
#region Indexer +++++++++++++++ +++++++++++++++ +++
public Teacher this[int index]
{
set
{
List[index] = value;
}
get
{
return (Teacher)List[index];
}
}
#endregion ------------------------------------
#region Public Methods +++++++++++++++ +++++++++++
public int Add(Teacher value)
{
return List.Add(value) ;
}
public int IndexOf(Teacher value)
{
return List.IndexOf(va lue);
}
public void Insert(int index, Teacher value)
{
List.Insert(ind ex, value);
}
public void Remove(Teacher value)
{
List.Remove(val ue);
}
public bool Contains(Teache r value)
{
return List.Contains(v alue);
}
#endregion --------------------------------------
#region Constructors +++++++++++++++ +++++++++++++
public Teachers() { }
#endregion ---------------------------------------
}
}
=============== =============== =============== =
"Jon Skeet [C# MVP]" wrote:
a <a@discussions. microsoft.com> wrote: I'm having trouble testing a custom object. I've tried many different
approaches. One is shown below.
The XML below shows the state of the object and I'm trying to test for that
state, ie there are NO classes in the Classes collection (Classes) of the
custom object.
The conditional expression returns the error shown below it...
<snip>
How about
if (Profile.Teache rs[0].Classes.Count= =0)
It's hard to say exactly whether that'll work or not without knowing
what the type of the property "Classes" is, but it's worth a try...
--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
