Entity Framework 4, WPF, and PropertyChanged event solution w/ T4-templating

While working on a relatively large WPF 4.0 project, I ran into a relatively common problem. The Entity-Framework doesn’t expose the “Property-Changed” event in all of the right places. Additionally, when I needed an “ObservableCollection” for updating a data-grid or list control of some type… I wasn’t provided with one out-of-the-box.

So enter T4-templates. What I did was definitely NOT a complete POCO class or “Repository pattern”. (Which you can learn more about here… “Using Repository Pattern with Entity Framework“) Instead, I simply wanted to expose the exact entities that EF 4.0 generates out-of-the-box… with some encapsulation classes that added “PropertyChanged” notifications and other useful things for my WPF project. This is REALLY useful because I can then make programmatic updates and see them reflected in the UI… regardless of whether I’m data-binding to a reference-type property of the entity-framework, or a scalar value-type property. Additionally, when I have an entity that contains a collection of sub-entities, I can now leverage the “ObservableCollection” concept to get the UI to automatically update if an item is programmatically added to the collection.

I guess the point here is to provide a stupid-simple way of turning any entity-framework EDMX file into a PropertyChanged/ObservableCollection aware series of Plain-Old-CLR-Object (POCO) entities whereby changes will still be able to be persisted back to the database via the “SaveChanges()” method and the WPF UI will update according to programmatic changes to the data.

So the T4-template is show below… and is also included as a link on this page. I know it’s only a fit for certain scenarios… but I tend to think it works well for simple scenarios. Simply change the file-name within the T4-template to point to your project’s EDMX file… and it will generate a series of “POCO” classes that encapsulate the functionality of the actual entity-classes for you.

Cool. Here’s the link…

[Note*** This T4 template distinguishes between some relationships in the EF model and others. It's selectively creating POCO classes and POCO class references depending on the multiplicity of the relationship between the entities. In other words... simple lookup-table relationships will not result in a POCO-class property data-type.]

Here’s the file contents :

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<#
//*********************************************************
//
//    Copyright (c) Microsoft. All rights reserved.
//    This code is licensed under the Microsoft Public License.
//    THIS CODE IS PROVIDED *AS IS* WITHOUT WARRANTY OF
//    ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING ANY
//    IMPLIED WARRANTIES OF FITNESS FOR A PARTICULAR
//    PURPOSE, MERCHANTABILITY, OR NON-INFRINGEMENT.
//
//*********************************************************
#>
<#@ template language="C#" debug="false" hostspecific="true"#>
<#@ include file="EF.Utility.CS.ttinclude"#><#@
 output extension=".cs"#><#
 
CodeGenerationTools code = new CodeGenerationTools(this);
MetadataLoader loader = new MetadataLoader(this);
CodeRegion region = new CodeRegion(this, 1);
MetadataTools ef = new MetadataTools(this);
 
string inputFile = @"../YourEFModelHere.edmx";
EdmItemCollection ItemCollection = loader.CreateEdmItemCollection(inputFile);
string namespaceName = code.VsNamespaceSuggestion();
 
EntityFrameworkTemplateFileManager fileManager = EntityFrameworkTemplateFileManager.Create(this);
 
// Write out support code to primary template output file
WriteHeader(fileManager);
BeginNamespace(namespaceName, code);
WriteCustomObservableCollection();
EndNamespace(namespaceName);
 
// Emit Entity Types
foreach (EntityType entity in ItemCollection.GetItems<EntityType>().OrderBy(e => e.Name))
{
	fileManager.StartNewFile(entity.Name + "Poco.cs");
 
	BeginNamespace(namespaceName, code);
	bool entityHasNullableFKs = entity.NavigationProperties.Any(np => np.GetDependentProperties().Any(p=>ef.IsNullable(p)));
#>
<#=Accessibility.ForType(entity)#> <#=code.SpaceAfter(code.AbstractOption(entity))#>partial class <#=code.Escape(entity)#><#=code.StringBefore(" : ", code.Escape(entity.BaseType))#>Poco : INotifyPropertyChanged
{
 
<#region.Begin("Poco Initialization");#>
 
	private <#=code.Escape(entity)#> _context;
	private CollisionTransEntities _dbEntities;
	public <#=code.Escape(entity)#> Context{ get { return _context; } internal set { _context = value; } }
	public event PropertyChangedEventHandler PropertyChanged;
 
	public <#=code.Escape(entity)#>Poco()
    {
		_context = new <#=code.Escape(entity)#>();
		_context.PropertyChanged += context_PropertyChanged;
		Initialize(true);
	}
 
	public <#=code.Escape(entity)#>Poco(<#=code.Escape(entity)#> context, CollisionTransEntities dbEntities)
    {
        _context = context;
		DbEntities = dbEntities; 
		_context.PropertyChanged += context_PropertyChanged;
		Initialize(false);
    }
 
	private void Initialize(bool skipSubCollectionInitialization)
	{
<#
	foreach (NavigationProperty navProperty in entity.NavigationProperties.Where(np => np.DeclaringType == entity))
	{
		NavigationProperty inverse = ef.Inverse(navProperty);
		if (navProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many)
		{
			WriteLine("		if (!skipSubCollectionInitialization)");
			WriteLine("			CreateNew" + navProperty.Name + "Collection();");
		}
		if ((inverse != null || ((AssociationType)navProperty.RelationshipType).IsForeignKey) &&
			navProperty.ToEndMember.RelationshipMultiplicity != RelationshipMultiplicity.Many)
        {
			WriteLine("		_context." + navProperty.Name + "Reference.AssociationChanged += " + navProperty.Name + "_AssociationChanged;");
		}
	}
#>
	}
 
	private void InitializeSubCollections()
	{
<#
	foreach (NavigationProperty navProperty in entity.NavigationProperties.Where(np => np.DeclaringType == entity))
	{
		NavigationProperty inverse = ef.Inverse(navProperty);
		if (navProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many)
		{
			WriteLine("		CreateNew" + navProperty.Name + "Collection();");
		}
	}
#>
	}
 
	public CollisionTransEntities DbEntities
	{ 
		get
		{
			return _dbEntities;
		}
		set
		{
			if(_dbEntities == null)
			{
				_dbEntities = value;
				//Now also "Initialize" the sub-collections...
				InitializeSubCollections();
			}
		}
	}
 
	void context_PropertyChanged(object sender, PropertyChangedEventArgs e)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(e.PropertyName));
    }
 
<#region.End();#>
<#
    region.Begin("Primitive Properties");
 
    foreach (EdmProperty edmProperty in entity.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == entity))
    {
        bool isForeignKey = entity.NavigationProperties.Any(np=>np.GetDependentProperties().Contains(edmProperty));
        bool isDefaultValueDefinedInModel = (edmProperty.DefaultValue != null);
        bool generateAutomaticProperty = false;
 
 
 
#>
 
    <#=PropertyVirtualModifier(Accessibility.ForProperty(edmProperty))#> <#=code.Escape(edmProperty.TypeUsage)#> <#=code.Escape(edmProperty)#>
    {
<#
        if (isForeignKey)
        {
#>
		<#=code.SpaceAfter(Accessibility.ForGetter(edmProperty))#>get { return _context.<#=code.Escape(edmProperty)#>; } //qwer1 Type:<#=code.Escape(edmProperty.TypeUsage)#>
		<#=code.SpaceAfter(Accessibility.ForSetter(edmProperty))#>set 
		{ 
			if(_context.<#=code.Escape(edmProperty)#> != value)
			{
				_context.PropertyChanged -= context_PropertyChanged;
				_context.<#=code.Escape(edmProperty)#> = value;
				_context.PropertyChanged += context_PropertyChanged;
				if (PropertyChanged != null)
					PropertyChanged(this, new PropertyChangedEventArgs("<#=code.Escape(edmProperty)#>"));
				<#=entityHasNullableFKs?"//Entity property has nullable-FKs":""#>
			}
		}
<#
        }
        else if (isDefaultValueDefinedInModel)
        {
#>
        <#=code.SpaceAfter(Accessibility.ForGetter(edmProperty))#>get qwer2{ return <#=code.FieldName(edmProperty)#>; }
        <#=code.SpaceAfter(Accessibility.ForSetter(edmProperty))#>set { <#=code.FieldName(edmProperty)#> = value; }
<#
        }
        else
        {
            generateAutomaticProperty = true;
#>
		<#=code.SpaceAfter(Accessibility.ForGetter(edmProperty))#>get { return _context.<#=code.Escape(edmProperty)#>; } //qwer3 Type:<#=code.Escape(edmProperty.TypeUsage)#>
		<#=code.SpaceAfter(Accessibility.ForSetter(edmProperty))#>set 
		{ 
			if(_context.<#=code.Escape(edmProperty)#> != value)
			{
				_context.PropertyChanged -= context_PropertyChanged;
				_context.<#=code.Escape(edmProperty)#> = value;
				_context.PropertyChanged += context_PropertyChanged;
				if (PropertyChanged != null)
					PropertyChanged(this, new PropertyChangedEventArgs("<#=code.Escape(edmProperty)#>"));
			}
		}
<#
        }
#>
    }
 
<#
        if (!generateAutomaticProperty)
        {
#>
<#
        }
    }
    region.End();
 
    region.Begin("Complex Properties");
 
    foreach(EdmProperty edmProperty in entity.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == entity))
    {
#>
 
    <#=PropertyVirtualModifier(Accessibility.ForProperty(edmProperty))#> <#=code.Escape(edmProperty.TypeUsage)#> <#=code.Escape(edmProperty)#>
    {
        <#=code.SpaceAfter(Accessibility.ForGetter(edmProperty))#>get dfgh{ return <#=code.FieldName(edmProperty)#>; }
        <#=code.SpaceAfter(Accessibility.ForSetter(edmProperty))#>set { <#=code.FieldName(edmProperty)#> = value; }
    }
    private <#=code.Escape(edmProperty.TypeUsage)#> <#=code.FieldName(edmProperty)#> = new <#=code.Escape(edmProperty.TypeUsage)#>();
<#
    }
 
    region.End();
 
    ////////
    //////// Write Navigation properties -------------------------------------------------------------------------------------------
    ////////
 
    region.Begin("Navigation Properties");
 
    foreach (NavigationProperty navProperty in entity.NavigationProperties.Where(np => np.DeclaringType == entity))
    {
        NavigationProperty inverse = ef.Inverse(navProperty);
        if (inverse != null &&  !IsReadWriteAccessibleProperty(inverse))
        {
            inverse = null;
        }
#>
 
<#
        if (navProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many)
        {
#>
    <#=PropertyVirtualModifier(Accessibility.ForReadOnlyProperty(navProperty))#> ObservableCollection<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco> <#=code.Escape(navProperty)#>
    {
        get //qwer4
        {
            CreateNew<#=code.Escape(navProperty)#>Collection();
            return <#=code.FieldName(navProperty)#>;
        }
        set
        {
<#
            if (inverse != null || ((AssociationType)navProperty.RelationshipType).IsForeignKey)
            {
#>
            if (!Object.ReferenceEquals(<#=code.FieldName(navProperty)#>, value))
            {
				CreateNew<#=code.Escape(navProperty)#>Collection();
            }
<#
            }
            else
            {
#>
            CreateNew<#=code.Escape(navProperty)#>Collection();
<#
            }
#>
 
			if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("<#=code.Escape(navProperty)#>"));
        }
    }
    private ObservableCollection<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco> <#=code.FieldName(navProperty)#>;
 
	private void CreateNew<#=code.Escape(navProperty)#>Collection()
    {
        if (<#=code.FieldName(navProperty)#> == null && _context.<#=code.Escape(navProperty)#> != null)
        {
            <#=code.FieldName(navProperty)#> = new ObservableCollection<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco>();
			IEnumerable<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>> efEntities = DbEntities.ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Modified | EntityState.Unchanged | EntityState.Deleted).Where(i => i.Entity is <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>).Select(i => i.Entity).Cast<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>>();
            foreach (var item in efEntities)
                <#=code.FieldName(navProperty)#>.Add(new <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco(item, DbEntities));
 
			//This will handle changes originating from the db-entities...
            _context.<#=code.Escape(navProperty)#>.AssociationChanged -= <#=code.Escape(navProperty)#>_AssociationChanged;
            _context.<#=code.Escape(navProperty)#>.AssociationChanged += <#=code.Escape(navProperty)#>_AssociationChanged;
 
			//This will handle changes originating from the User-Interface...
            <#=code.FieldName(navProperty)#>.CollectionChanged -= <#=code.Escape(navProperty)#>Collection_CollectionChanged;
            <#=code.FieldName(navProperty)#>.CollectionChanged += <#=code.Escape(navProperty)#>Collection_CollectionChanged;
        }
		else if (<#=code.FieldName(navProperty)#> != null && _context.<#=code.Escape(navProperty)#> == null)
			<#=code.FieldName(navProperty)#> = null;
    } 
 
	void <#=code.Escape(navProperty)#>Collection_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.NewItems != null && e.NewItems.Count > 0)
		{
            _context.<#=code.Escape(navProperty)#>.AssociationChanged -= <#=code.Escape(navProperty)#>_AssociationChanged;
            foreach (var newItem in e.NewItems)
                _context.<#=code.Escape(navProperty)#>.Add((newItem as <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco).Context);
			_context.<#=code.Escape(navProperty)#>.AssociationChanged += <#=code.Escape(navProperty)#>_AssociationChanged;
		}
        else if(e.OldItems != null && e.OldItems.Count > 0)
		{
            _context.<#=code.Escape(navProperty)#>.AssociationChanged -= <#=code.Escape(navProperty)#>_AssociationChanged;
            foreach (var removedItem in e.OldItems)
                _dbEntities.DeleteObject((removedItem as <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco).Context);
			//_context.<#=code.Escape(navProperty)#>.Remove((removedItem as <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco).Context);
			_context.<#=code.Escape(navProperty)#>.AssociationChanged += <#=code.Escape(navProperty)#>_AssociationChanged;
		}
    }
 
	void <#=code.Escape(navProperty)#>_AssociationChanged(object sender, CollectionChangeEventArgs e)
    {
        <#=code.Escape(navProperty.ToEndMember.GetEntityType())#> elem = e.Element as <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>;
        if (elem != null)
        {
            if (e.Action == CollectionChangeAction.Add)
			{
				this.<#=code.FieldName(navProperty)#>.CollectionChanged -= <#=code.Escape(navProperty)#>Collection_CollectionChanged;
                this.<#=code.FieldName(navProperty)#>.Add(new <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco(elem, DbEntities));
				this.<#=code.FieldName(navProperty)#>.CollectionChanged += <#=code.Escape(navProperty)#>Collection_CollectionChanged;
			}
            else if (e.Action == CollectionChangeAction.Remove)
			{
				this.<#=code.FieldName(navProperty)#>.CollectionChanged -= <#=code.Escape(navProperty)#>Collection_CollectionChanged;
				<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco pocoToRemove = this.<#=code.FieldName(navProperty)#>.Where(i => i.Context.Equals(elem)).SingleOrDefault();
                this.<#=code.FieldName(navProperty)#>.Remove(pocoToRemove); 
				this.<#=code.FieldName(navProperty)#>.CollectionChanged += <#=code.Escape(navProperty)#>Collection_CollectionChanged;
			}
            else if (e.Action == CollectionChangeAction.Refresh)
            {
				<#=code.FieldName(navProperty)#>.CollectionChanged -= <#=code.Escape(navProperty)#>Collection_CollectionChanged;
                new List<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco>(<#=code.FieldName(navProperty)#>).ForEach(i => <#=code.FieldName(navProperty)#>.Remove(i));
				<#=code.FieldName(navProperty)#>.CollectionChanged += <#=code.Escape(navProperty)#>Collection_CollectionChanged;
 
				IEnumerable<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>> efEntities = DbEntities.ObjectStateManager.GetObjectStateEntries(EntityState.Added | EntityState.Modified | EntityState.Unchanged | EntityState.Deleted).Where(i => i.Entity is <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>).Select(i => i.Entity).Cast<<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>>();
                foreach (var item in efEntities)
                    <#=code.FieldName(navProperty)#>.Add(new <#=code.Escape(navProperty.ToEndMember.GetEntityType())#>Poco(item, DbEntities));
 
				_context.<#=code.Escape(navProperty)#>.AssociationChanged -= <#=code.Escape(navProperty)#>_AssociationChanged;
                _context.<#=code.Escape(navProperty)#>.AssociationChanged += <#=code.Escape(navProperty)#>_AssociationChanged;
            }
        }
    }
 
<#
        }
        else
        {
#>
    <#=PropertyVirtualModifier(Accessibility.ForProperty(navProperty))#> <#=code.Escape(navProperty.ToEndMember.GetEntityType())#> <#=code.Escape(navProperty)#>
    {
<#
            if (inverse != null || ((AssociationType)navProperty.RelationshipType).IsForeignKey)
            {
#>
		<#=code.SpaceAfter(Accessibility.ForGetter(navProperty))#>get { return _context.<#=code.Escape(navProperty)#>; } //dfgh2 Type:<#=code.Escape(navProperty.ToEndMember.GetEntityType())#>
        <#=code.SpaceAfter(Accessibility.ForSetter(navProperty))#>set
		{  
			if (!Object.ReferenceEquals(_context.<#=code.Escape(navProperty)#>, value))
            {
				_context.<#=code.Escape(navProperty)#>Reference.AssociationChanged -= <#=code.Escape(navProperty)#>_AssociationChanged;
				_context.<#=code.Escape(navProperty)#> = value;
				_context.<#=code.Escape(navProperty)#>Reference.AssociationChanged += <#=code.Escape(navProperty)#>_AssociationChanged;
				if (PropertyChanged != null)
					PropertyChanged(this, new PropertyChangedEventArgs("<#=code.Escape(navProperty)#>"));
			}
		}
    }
 
	void <#=code.Escape(navProperty)#>_AssociationChanged(object sender, CollectionChangeEventArgs e)
    {
			if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("<#=code.Escape(navProperty)#>"));
	}
<#
            }
            else
            {
#>
        <#=code.SpaceAfter(Accessibility.ForGetter(navProperty))#>get dfgh3;
        <#=code.SpaceAfter(Accessibility.ForSetter(navProperty))#>set;
    }
<#
            }
        }
    }
    region.End();
 
    region.Begin("Association Fixup");
 
 
    region.End();
#>
}
<#
    EndNamespace(namespaceName);
}
 
foreach (ComplexType complex in ItemCollection.GetItems<ComplexType>().OrderBy(e => e.Name))
{
    fileManager.StartNewFile(complex.Name + ".cs");
    BeginNamespace(namespaceName, code);
#>
<#=Accessibility.ForType(complex)#> partial class <#=code.Escape(complex)#>
{
<#
    region.Begin("Primitive Properties");
 
    foreach(EdmProperty edmProperty in complex.Properties.Where(p => p.TypeUsage.EdmType is PrimitiveType && p.DeclaringType == complex))
    {
        bool isDefaultValueDefinedInModel = (edmProperty.DefaultValue != null);
#>
 
    <#=Accessibility.ForProperty(edmProperty)#> <#=code.Escape(edmProperty.TypeUsage)#> <#=code.Escape(edmProperty)#>
<#
        if (isDefaultValueDefinedInModel)
        {
#>
    {
        <#=code.SpaceAfter(Accessibility.ForGetter(edmProperty))#>get dfgh4{ return <#=code.FieldName(edmProperty)#>; }
        <#=code.SpaceAfter(Accessibility.ForSetter(edmProperty))#>set { <#=code.FieldName(edmProperty)#> = value; }
    }
    private <#=code.Escape(edmProperty.TypeUsage)#> <#=code.FieldName(edmProperty)#><#=code.StringBefore(" = ", code.CreateLiteral(edmProperty.DefaultValue))#>;
<#
        }
        else
        {
#>
    {
        <#=code.SpaceAfter(Accessibility.ForGetter(edmProperty))#>get dfgh5;
        <#=code.SpaceAfter(Accessibility.ForSetter(edmProperty))#>set;
    }
<#
        }
    }
 
    region.End();
 
    region.Begin("Complex Properties");
 
    foreach(EdmProperty edmProperty in complex.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == complex))
    {
#>
 
    <#=Accessibility.ForProperty(edmProperty)#> <#=code.Escape(edmProperty.TypeUsage)#> <#=code.Escape(edmProperty)#>
    {
        <#=code.SpaceAfter(Accessibility.ForGetter(edmProperty))#>get dfgh6{ return <#=code.FieldName(edmProperty)#>; }
        <#=code.SpaceAfter(Accessibility.ForSetter(edmProperty))#>set { <#=code.FieldName(edmProperty)#> = value; }
    }
    private <#=code.Escape(edmProperty.TypeUsage)#> <#=code.FieldName(edmProperty)#> = new <#=code.Escape(edmProperty.TypeUsage)#>();
<#
    }
 
    region.End();
#>
}
<#
    EndNamespace(namespaceName);
}
 
if (!VerifyTypesAreCaseInsensitiveUnique(ItemCollection))
{
    return "";
}
 
fileManager.Process();
 
#>
<#+
void WriteHeader(EntityFrameworkTemplateFileManager fileManager, params string[] extraUsings)
{
    fileManager.StartHeader();
#>
//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template written by Chad W. Stoker.
//	   10/18/2011
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------
 
using System;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Data;
using System.ComponentModel;
 
<#=String.Join(String.Empty, extraUsings.Select(u => "using " + u + ";" + Environment.NewLine).ToArray())#>
<#+
    fileManager.EndBlock();
}
 
void BeginNamespace(string namespaceName, CodeGenerationTools code)
{
    CodeRegion region = new CodeRegion(this);
    if (!String.IsNullOrEmpty(namespaceName))
    {
#>
namespace <#=code.EscapeNamespace(namespaceName)#>
{
<#+
        PushIndent(CodeRegion.GetIndent(1));
    }
}
 
 
void EndNamespace(string namespaceName)
{
    if (!String.IsNullOrEmpty(namespaceName))
    {
        PopIndent();
#>
}
<#+
    }
}
 
bool IsReadWriteAccessibleProperty(EdmMember member)
{
    string setter = Accessibility.ForWriteOnlyProperty(member);
    string getter = Accessibility.ForReadOnlyProperty(member);
 
    return getter != "private" && getter != "protected" && setter != "private" && setter != "protected";
}
 
string PropertyVirtualModifier(string accessibility)
{
    return accessibility + (accessibility != "private" ? " virtual" : "");
}
 
void WriteCustomObservableCollection()
{
#>
// An System.Collections.ObjectModel.ObservableCollection that raises
// individual item removal notifications on clear and prevents adding duplicates.
public class FixupCollection<T> : ObservableCollection<T>
{
    protected override void ClearItems()
    {
        new List<T>(this).ForEach(t => Remove(t));
    }
 
    protected override void InsertItem(int index, T item)
    {
        if (!this.Contains(item))
        {
            base.InsertItem(index, item);
        }
    }
}
<#+
}
 
bool VerifyTypesAreCaseInsensitiveUnique(EdmItemCollection itemCollection)
{
    Dictionary<string, bool> alreadySeen = new Dictionary<string, bool>(StringComparer.OrdinalIgnoreCase);
    foreach(StructuralType type in itemCollection.GetItems<StructuralType>())
    {
        if (!(type is EntityType || type is ComplexType))
        {
            continue;
        }
 
        if (alreadySeen.ContainsKey(type.FullName))
        {
            Error(String.Format(CultureInfo.CurrentCulture, "This template does not support types that differ only by case, the types {0} are not supported", type.FullName));
            return false;
        }
        else
        {
            alreadySeen.Add(type.FullName, true);
        }
 
    }
 
    return true;
}
#>

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