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POHelp mapping list of class objects using NHibernate
 

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  1. POHelp mapping list of class objects using NHibernate
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    <p>I have a class that contains a list of objects.</p> <p>I previously had this as type of IList which mapped fine. However, I was wanting to add the ability to add/remove/edit items in this List via a PropertyGrid control.</p> <p>I was therefore required to set the List as a type of Collection derived from CollectionBase and that contained a ICustomTypeDescriptor in order for this to work rather than the original IList.</p> <p>I was wandering if someone could tell me how, or if it will be possible to map this list using this method, or how I can modify my current approach to get the items in the list to be editable via the PropertyGrid.</p> <p>Here is my CollectionClass, which I'd also like to figure out how to make generic so I could reuse this, but nevertheless here are the two classes which I had to define in order to make the List of objects editable via the PropertyGrid:</p> <pre><code>public class ZoneCollection : CollectionBase, ICustomTypeDescriptor { #region Collection Implementation /// &lt;summary&gt; /// Adds an zone object to the collection /// &lt;/summary&gt; /// &lt;param name="emp"&gt;&lt;/param&gt; public void Add(Zone zone) { this.List.Add(zone); } /// &lt;summary&gt; /// Removes an zone object from the collection /// &lt;/summary&gt; /// &lt;param name="emp"&gt;&lt;/param&gt; public void Remove(Zone zone) { this.List.Remove(zone); } /// &lt;summary&gt; /// Returns an employee object at index position. /// &lt;/summary&gt; public Zone this[int index] { get { return (Zone)this.List[index]; } } #endregion // Implementation of interface ICustomTypeDescriptor #region ICustomTypeDescriptor impl public String GetClassName() { return TypeDescriptor.GetClassName(this, true); } public AttributeCollection GetAttributes() { return TypeDescriptor.GetAttributes(this, true); } public String GetComponentName() { return TypeDescriptor.GetComponentName(this, true); } public TypeConverter GetConverter() { return TypeDescriptor.GetConverter(this, true); } public EventDescriptor GetDefaultEvent() { return TypeDescriptor.GetDefaultEvent(this, true); } public PropertyDescriptor GetDefaultProperty() { return TypeDescriptor.GetDefaultProperty(this, true); } public object GetEditor(Type editorBaseType) { return TypeDescriptor.GetEditor(this, editorBaseType, true); } public EventDescriptorCollection GetEvents(Attribute[] attributes) { return TypeDescriptor.GetEvents(this, attributes, true); } public EventDescriptorCollection GetEvents() { return TypeDescriptor.GetEvents(this, true); } public object GetPropertyOwner(PropertyDescriptor pd) { return this; } /// &lt;summary&gt; /// Called to get the properties of this type. Returns properties with certain /// attributes. this restriction is not implemented here. /// &lt;/summary&gt; /// &lt;param name="attributes"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public PropertyDescriptorCollection GetProperties(Attribute[] attributes) { return GetProperties(); } /// &lt;summary&gt; /// Called to get the properties of this type. /// &lt;/summary&gt; /// &lt;returns&gt;&lt;/returns&gt; public PropertyDescriptorCollection GetProperties() { // Create a collection object to hold property descriptors PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null); // Iterate the list of employees for (int i = 0; i &lt; this.List.Count; i++) { // Create a property descriptor for the employee item and add to the property descriptor collection ZoneCollectionPropertyDescriptor pd = new ZoneCollectionPropertyDescriptor(this, i); pds.Add(pd); } // return the property descriptor collection return pds; } #endregion } /// &lt;summary&gt; /// Summary description for CollectionPropertyDescriptor. /// &lt;/summary&gt; public class ZoneCollectionPropertyDescriptor : PropertyDescriptor { private ZoneCollection collection = null; private int index = -1; public ZoneCollectionPropertyDescriptor(ZoneCollection coll, int idx) : base("#" + idx.ToString(), null) { this.collection = coll; this.index = idx; } public override AttributeCollection Attributes { get { return new AttributeCollection(null); } } public override bool CanResetValue(object component) { return true; } public override Type ComponentType { get { return this.collection.GetType(); } } public override string DisplayName { get { Zone zone = this.collection[index]; return zone.ID.ToString(); } } public override string Description { get { Zone zone = this.collection[index]; StringBuilder sb = new StringBuilder(); sb.Append(zone.ID.ToString()); if ( zone.Streets.Route != String.Empty || zone.Streets.Crossing != String.Empty) sb.Append("::"); if (zone.Streets.Route != String.Empty) sb.Append(zone.Streets.Route); if ( zone.Streets.Crossing != String.Empty) { sb.Append(" and "); sb.Append(zone.Streets.Crossing); } return sb.ToString(); } } public override object GetValue(object component) { return this.collection[index]; } public override bool IsReadOnly { get { return false; } } public override string Name { get { return "#" + index.ToString(); } } public override Type PropertyType { get { return this.collection[index].GetType(); } } public override void ResetValue(object component) { } public override bool ShouldSerializeValue(object component) { return true; } public override void SetValue(object component, object value) { // this.collection[index] = value; } } </code></pre> <p>Here is my Zone class:</p> <pre><code>[ComVisible(true)] [TypeConverter(typeof(ExpandableObjectConverter))] [CategoryAttribute("Configuration")] [Serializable] public class Zone { #region Private Fields private bool active; private string dir; private Heading heading = new Heading(); private int id; private int intID; private Position start = new Position(); private Position finish = new Position(); private int width; private Position[] corners = new Position[4]; private Streets streets = new Streets(); #endregion #region Constructors public Zone() { if (Program.main != null) { IntID = Program.main.intID; Intersection intersection = Program.data.Intersections.list.Find( delegate(Intersection tInt) { return tInt.ID == IntID; } ); if (intersection != null) { Streets.Crossing = intersection.Streets.Crossing; Streets.Route = intersection.Streets.Route; } } } #endregion #region Properties public virtual long PK { get; set; } [Browsable(false)] public virtual bool Active { get { return active; } set { active = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The direction for the Zone.")] public virtual string Dir { get { return dir; } set { dir = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The heading for the Zone.")] public virtual Heading Heading { get { return heading; } set { heading = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The Zone Identification Number.")] public virtual int ID { get { return id; } set { id = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The Identification Number associated with the Priority Detector of the Zone.")] public virtual int IntID { get { return intID; } set { intID = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The location of the Zone's Start.")] public virtual Position Start { get { return start; } set { start = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The location of the Zone's Finish.")] public virtual Position Finish { get { return finish; } set { finish = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The width of the Zone.")] public virtual int Width { get { return width; } set { width = value; } } [Browsable(false)] public virtual Position[] Corners { get { return corners; } set { corners = value; } } [CategoryAttribute("Configuration"), DescriptionAttribute("The streets associated with the Zone."), DisplayName("Zone Streets")] public virtual Streets Streets { get { return streets; } set { streets = value; } } #endregion } </code></pre> <p>And here is my original mapping of the list of the Zone class objects contained within my Intersection class:</p> <pre><code>&lt;hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"&gt; &lt;class xmlns="urn:nhibernate-mapping-2.2" name="EMTRAC.Devices.Device, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" table="`Device`" lazy="false"&gt; &lt;id name="PK" type="System.Int64, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"&gt; &lt;column name="PK" /&gt; &lt;generator class="identity" /&gt; &lt;/id&gt; &lt;many-to-one class="EMTRAC.Connections.Connection, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="LocalConnection" lazy="false" cascade="all"&gt; &lt;column name="LocalConnection_id" /&gt; &lt;/many-to-one&gt; &lt;many-to-one class="EMTRAC.Connections.Connection, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Connection" lazy="false" cascade="all"&gt; &lt;column name="Connection_id" /&gt; &lt;/many-to-one&gt; &lt;many-to-one class="EMTRAC.Packets.Packet, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Configuration" lazy="false" cascade="all"&gt; &lt;column name="Configuration_id" /&gt; &lt;/many-to-one&gt; &lt;joined-subclass name="EMTRAC.Intersections.Intersection, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" lazy="false"&gt; &lt;key&gt; &lt;column name="Device_id" /&gt; &lt;/key&gt; &lt;bag name="Zones" cascade="all-delete-orphan"&gt; &lt;key&gt; &lt;column name="Intersection_id" /&gt; &lt;/key&gt; &lt;one-to-many class="EMTRAC.Zones.Zone, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/&gt; &lt;/bag&gt; &lt;many-to-one class="EMTRAC.Intersections.Streets, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Streets" lazy="false" cascade="all"&gt; &lt;column name="Streets_id" /&gt; &lt;/many-to-one&gt; &lt;many-to-one class="EMTRAC.Positions.Position, EMTRAC_v3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" name="Position" lazy="false" cascade="all"&gt; &lt;column name="Position" /&gt; &lt;/many-to-one&gt; &lt;/joined-subclass&gt; &lt;/class&gt; </code></pre> <p></p> <p>I originally went with a simple bag b/c I was using an IList, but I'm not sure what or how I would do this now that the Zones list is not an IList but rather a ZoneCollection class that derrives from CollectionBase.</p> <p>I assume it is puking b/c I don't have the ZoneCollection class mapped out, but I don't know how to begin mapping this b/c all the class there is is a list of zones objects. Do I just map the class and have a bag inside that class?</p> <p>Any suggestions?</p>
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