private static IEnumerable <IPropertyConstraint> GetConstraints(NavigationProperty from, NavigationProperty to)
{
var fromProp = from.GetProperty();
var toProp = to.GetProperty();
var fromMultiplicity = from.FromEndMember.RelationshipMultiplicity;
var toMultiplicity = from.ToEndMember.RelationshipMultiplicity;
if (fromMultiplicity == RelationshipMultiplicity.Many && toMultiplicity == RelationshipMultiplicity.Many)
{
yield return(CreateGenericConstraint(typeof(ManyToManyPropertyConstraint <,>), fromProp, toProp));
yield return(CreateGenericConstraint(typeof(ManyToManyPropertyConstraint <,>), toProp, fromProp));
}
else if (fromMultiplicity == RelationshipMultiplicity.Many)
{
yield return(CreateGenericConstraint(typeof(ManyToOnePropertyConstraint <,>), fromProp, toProp));
yield return(CreateGenericConstraint(typeof(OneToManyPropertyConstraint <,>), toProp, fromProp));
}
else if (toMultiplicity == RelationshipMultiplicity.Many)
{
yield return(CreateGenericConstraint(typeof(OneToManyPropertyConstraint <,>), fromProp, toProp));
yield return(CreateGenericConstraint(typeof(ManyToOnePropertyConstraint <,>), toProp, fromProp));
}
else
{
yield return(CreateGenericConstraint(typeof(OneToOnePropertyConstraint <,>), fromProp, toProp));
yield return(CreateGenericConstraint(typeof(OneToOnePropertyConstraint <,>), toProp, fromProp));
}
var fromForeignKey = GetForeignKeyConstraint(from);
if (fromForeignKey != null)
{
yield return(fromForeignKey);
}
var toForeignKey = GetForeignKeyConstraint(to);
if (toForeignKey != null)
{
yield return(toForeignKey);
}
}
private static IPropertyConstraint GetForeignKeyConstraint(NavigationProperty navProp)
{
if (navProp.GetDependentProperties().Count() != 1 ||
navProp.ToEndMember.GetEntityType().KeyProperties.Count != 1)
{
return(null);
}
var dependencyProp = navProp.GetDependentProperties().Single();
var keyProp = navProp.ToEndMember.GetEntityType().KeyProperties.Single();
var fromType = navProp.FromEndMember.GetEntityType().GetClrType();
var toType = navProp.ToEndMember.GetEntityType().GetClrType();
var navPropInfo = navProp.GetProperty();
var foreignKeyPropInfo = fromType.GetProperty(dependencyProp);
var keyPropInfo = toType.GetProperty(keyProp);
var keyType = keyPropInfo.PropertyType;
var type = typeof(ForeignKeyConstraint <, ,>)
.MakeGenericType(fromType, toType, keyType);
return((IPropertyConstraint)Activator.CreateInstance(type, navPropInfo, foreignKeyPropInfo, keyPropInfo));
}