public static EntityType GetObjectSpaceEntityByType <T>(this MetadataWorkspace metadataWorkspace)
{
ObjectItemCollection objectItemCollection = (ObjectItemCollection)metadataWorkspace.GetItemCollection(DataSpace.OSpace);
EntityType entityType = objectItemCollection.GetItems <EntityType>()
.FirstOrDefault(x => objectItemCollection.GetClrType(x) == typeof(T));
return(entityType);
}
/// <summary>
/// Gets entity type by CLR type.
/// </summary>
/// <param name="ctx">Context instance</param>
/// <param name="type">Type to get EntityType for</param>
/// <returns><see cref="EntityType"/> instance if type is an entity type, null otherwise.</returns>
public static EntityType GetEntityType(this DbContext ctx, Type type)
{
// Will not work for EF Core: https://stackoverflow.com/a/37651883
// should use context.Model, then model.FindEntityType(source.Type)
ObjectItemCollection objectItemCollection = (ObjectItemCollection)((IObjectContextAdapter)ctx).ObjectContext.MetadataWorkspace.GetItemCollection(DataSpace.OSpace);
ReadOnlyCollection <EntityType> entityTypes = objectItemCollection.GetItems <EntityType>();
return(entityTypes.FirstOrDefault(et => objectItemCollection.GetClrType(et) == type));
}
/// <summary>
/// Populates the ComplexTypes and GeneratedComplexTypes dictionaries from the MetadataWorkspace.
/// </summary>
private void PopulateComplexTypesInObjectContext()
{
ObjectItemCollection itemCollection = this.MetadataWorkspace.GetItemCollection(DataSpace.OSpace) as ObjectItemCollection;
foreach (ComplexType objectSpaceEntityType in itemCollection.GetItems <ComplexType>())
{
Type clrType = itemCollection.GetClrType(objectSpaceEntityType);
StructuralType edmComplexType;
if (this.MetadataWorkspace.TryGetEdmSpaceType(objectSpaceEntityType, out edmComplexType))
{
this.ComplexTypes[(ComplexType)edmComplexType] = clrType;
}
}
}
/// <summary>
/// Gets a dictionary of all entity types associated with the current DbContext type.
/// The key is the EntityType (CSpace) and the value is the CLR type of the generated entity.
/// </summary>
/// <returns>A dictionary keyed by entity type and returning corresponding CLR type</returns>
private Dictionary <EntityType, Type> GetEntityTypesInContext()
{
Dictionary <EntityType, Type> entities = new Dictionary <EntityType, Type>();
ObjectItemCollection itemCollection = this.MetadataWorkspace.GetItemCollection(DataSpace.OSpace) as ObjectItemCollection;
foreach (EntityType objectSpaceEntityType in itemCollection.GetItems <EntityType>())
{
Type clrType = itemCollection.GetClrType(objectSpaceEntityType);
// Skip the EF CodeFirst specific EdmMetadata type
if (DbContextUtilities.CompareWithSystemType(clrType, BusinessLogicClassConstants.EdmMetadataTypeName))
{
continue;
}
StructuralType edmEntityType;
if (this.MetadataWorkspace.TryGetEdmSpaceType(objectSpaceEntityType, out edmEntityType))
{
entities[(EntityType)edmEntityType] = clrType;
}
}
return(entities);
}
