/// <summary>
/// Gets the metadata for an entityset using the .NET type information of an entity
/// </summary>
/// <param name="entityType">.NET CLR type information of an entity</param>
/// <returns>metatdata for the passed entity or nothing if not found</returns>
/// <remarks>
/// </remarks>
private static EntitySetBase GetEntitySet(Type entityType)
{
EntitySetBase result = null;
if (entityType != null && metaData != null)
{
// Get attribute of entity type using reflection and LINQ on attributes
EdmEntityTypeAttribute edmAttrib = default(EdmEntityTypeAttribute);
edmAttrib = entityType.GetCustomAttributes(typeof(EdmEntityTypeAttribute), true).FirstOrDefault() as EdmEntityTypeAttribute;
////Debug.Assert(edmAttrib != null);
// Get entity containters for metadata
var globalItems = metaData.GetItems(DataSpace.CSpace);
// LINQ query on metadata conceptual space
var query2 = from c in globalItems
where c.BuiltInTypeKind == BuiltInTypeKind.EntityContainer
from s in ((EntityContainer)c).BaseEntitySets
where s.ElementType.Name == edmAttrib.Name &&
s.ElementType.NamespaceName == edmAttrib.NamespaceName
select(EntitySetBase) s;
result = query2.FirstOrDefault();
}
return(result);
}
public static void ApplyPropertyChanges <T>(this ObjectContext context, T entity)
where T : EntityObject
{
EdmEntityTypeAttribute entityTypeAttr = (EdmEntityTypeAttribute)Attribute.GetCustomAttribute(typeof(T), typeof(EdmEntityTypeAttribute), false);
if (entityTypeAttr == null)
{
throw new NotSupportedException("T is not an entity.");
}
context.ApplyPropertyChanges(entityTypeAttr.Name, entity);
}
/// <summary>
/// Returns the entity typename for the given .NET type.
/// </summary>
public string GetEntityTypeNameOf(Type type)
{
EdmEntityTypeAttribute attr = (EdmEntityTypeAttribute)type.GetCustomAttributes(typeof(EdmEntityTypeAttribute), true).FirstOrDefault();
if (attr != null)
{
return(attr.NamespaceName + "." + attr.Name);
}
else
{
return(null);
}
}
public static EntityKey GetEntityKey <T>(this ObjectContext context, T entity)
where T : EntityObject
{
EdmEntityTypeAttribute entityTypeAttr = (EdmEntityTypeAttribute)Attribute.GetCustomAttribute(entity.GetType(), typeof(EdmEntityTypeAttribute), false);
if (entityTypeAttr == null)
{
throw new NotSupportedException("T is not an entity.");
}
string entityFullname = context.DefaultContainerName + "." + entityTypeAttr.Name;
return(new System.Data.EntityKey(entityFullname,
from p in entity.GetType().GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public)
where p.GetGetMethod(false) != null
let attribute = (EdmScalarPropertyAttribute)Attribute.GetCustomAttribute(p, typeof(EdmScalarPropertyAttribute))
where attribute != null && attribute.EntityKeyProperty
select new KeyValuePair <string, object>(p.Name, p.GetValue(entity, null))));
}
public static EntityObject AttachExistedObject(this ObjectContext context, object objEntity)
{
EntityObject entity = objEntity as EntityObject;
EdmEntityTypeAttribute entityTypeAttr = (EdmEntityTypeAttribute)Attribute.GetCustomAttribute(objEntity.GetType(), typeof(EdmEntityTypeAttribute), false);
if (entityTypeAttr == null)
{
throw new NotSupportedException("T is not an entity.");
}
if (entity.EntityKey == null)
{
string entityFullname = context.DefaultContainerName + "." + entityTypeAttr.Name;
entity.EntityKey = new System.Data.EntityKey(entityFullname,
from p in objEntity.GetType().GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public)
where p.GetGetMethod(false) != null
let attribute = (EdmScalarPropertyAttribute)Attribute.GetCustomAttribute(p, typeof(EdmScalarPropertyAttribute))
where attribute != null && attribute.EntityKeyProperty
select new KeyValuePair <string, object>(p.Name, p.GetValue(entity, null)));
}
context.Attach(entity);
context.ApplyPropertyChanges(entityTypeAttr.Name, entity);
return(entity);
}
public static string GetEntityTableName <T>() where T : EntityObject
{
EdmEntityTypeAttribute attribute = (EdmEntityTypeAttribute)Attribute.GetCustomAttribute(typeof(T), typeof(EdmEntityTypeAttribute), false);
return((attribute == null) ? "" : attribute.Name);
}
private static object[] GetArgs(EdmEntityTypeAttribute attribute)
{
return(new object[] { });
}
