internal static IBindingList CreateViewForQuery <TElement>(TypeUsage elementEdmTypeUsage, IEnumerable <TElement> queryResults, ObjectContext objectContext, bool forceReadOnly, EntitySet singleEntitySet)
{
EntityUtil.CheckArgumentNull(queryResults, "queryResults");
EntityUtil.CheckArgumentNull(objectContext, "objectContext");
Type clrElementType = null;
TypeUsage ospaceElementTypeUsage = GetOSpaceTypeUsage(elementEdmTypeUsage, objectContext);
// Map the O-Space EDM type to a CLR type.
// If the mapping is unsuccessful, fallback to TElement type.
if (ospaceElementTypeUsage == null)
{
clrElementType = typeof(TElement);
}
{
clrElementType = GetClrType <TElement>(ospaceElementTypeUsage.EdmType);
}
IBindingList objectView;
object eventDataSource = objectContext.ObjectStateManager;
// If the clrElementType matches the declared TElement type, optimize the construction of the ObjectView
// by avoiding a reflection-based instantiation.
if (clrElementType == typeof(TElement))
{
ObjectViewQueryResultData <TElement> viewData = new ObjectViewQueryResultData <TElement>((IEnumerable)queryResults, objectContext, forceReadOnly, singleEntitySet);
objectView = new ObjectView <TElement>(viewData, eventDataSource);
}
else if (clrElementType == null)
{
ObjectViewQueryResultData <DbDataRecord> viewData = new ObjectViewQueryResultData <DbDataRecord>((IEnumerable)queryResults, objectContext, true, null);
objectView = new DataRecordObjectView(viewData, eventDataSource, (RowType)ospaceElementTypeUsage.EdmType, typeof(TElement));
}
else
{
if (!typeof(TElement).IsAssignableFrom(clrElementType))
{
throw EntityUtil.ValueInvalidCast(clrElementType, typeof(TElement));
}
// Use reflection to create an instance of the generic ObjectView and ObjectViewQueryResultData classes,
// using clrElementType as the value of TElement generic type parameter for both classes.
Type objectViewDataType = genericObjectViewQueryResultDataType.MakeGenericType(clrElementType);
ConstructorInfo viewDataConstructor = objectViewDataType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic,
null,
new Type[] { typeof(IEnumerable), typeof(ObjectContext), typeof(bool), typeof(EntitySet) },
null);
Debug.Assert(viewDataConstructor != null, "ObjectViewQueryResultData constructor not found. Please ensure constructor signature is correct.");
// Create ObjectViewQueryResultData instance
object viewData = viewDataConstructor.Invoke(new object[] { queryResults, objectContext, forceReadOnly, singleEntitySet });
// Create ObjectView instance
objectView = CreateObjectView(clrElementType, objectViewDataType, viewData, eventDataSource);
}
return(objectView);
}
internal static IBindingList CreateViewForEntityCollection <TElement>(EntityType entityType, EntityCollection <TElement> entityCollection)
where TElement : class
{
Type clrElementType = null;
TypeUsage entityTypeUsage = entityType == null ? null : TypeUsage.Create(entityType);
TypeUsage ospaceElementTypeUsage = GetOSpaceTypeUsage(entityTypeUsage, entityCollection.ObjectContext);
// Map the O-Space EDM type to a CLR type.
// If the mapping is unsuccessful, fallback to TElement type.
if (ospaceElementTypeUsage == null)
{
clrElementType = typeof(TElement);
}
else
{
clrElementType = GetClrType <TElement>(ospaceElementTypeUsage.EdmType);
// A null clrElementType is returned by GetClrType if the EDM type is a RowType with no specific CLR type mapping.
// This should not happen when working with EntityCollections, but if it does, fallback to TEntityRef type.
Debug.Assert(clrElementType != null, "clrElementType has unexpected value of null.");
if (clrElementType == null)
{
clrElementType = typeof(TElement);
}
}
IBindingList objectView;
// If the clrElementType matches the declared TElement type, optimize the construction of the ObjectView
// by avoiding a reflection-based instantiation.
if (clrElementType == typeof(TElement))
{
ObjectViewEntityCollectionData <TElement, TElement> viewData = new ObjectViewEntityCollectionData <TElement, TElement>(entityCollection);
objectView = new ObjectView <TElement>(viewData, entityCollection);
}
else
{
if (!typeof(TElement).IsAssignableFrom(clrElementType))
{
throw EntityUtil.ValueInvalidCast(clrElementType, typeof(TElement));
}
// Use reflection to create an instance of the generic ObjectView and ObjectViewEntityCollectionData classes,
// using clrElementType as the value of TElement generic type parameter for both classes.
Type objectViewDataType = genericObjectViewEntityCollectionDataType.MakeGenericType(clrElementType, typeof(TElement));
ConstructorInfo viewDataConstructor = objectViewDataType.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic,
null,
new Type[] { typeof(EntityCollection <TElement>) },
null);
Debug.Assert(viewDataConstructor != null, "ObjectViewEntityCollectionData constructor not found. Please ensure constructor signature is correct.");
// Create ObjectViewEntityCollectionData instance
object viewData = viewDataConstructor.Invoke(new object[] { entityCollection });
// Create ObjectView instance
objectView = CreateObjectView(clrElementType, objectViewDataType, viewData, entityCollection);
}
return(objectView);
}
