public static IncludePaths Create(params IncludePath[] paths)
{
var include = new IncludePaths();
foreach (var item in paths)
{
include.Paths.Add(item);
}
return(include);
}
public static IncludePaths Create <TEntity>(params Expression <Func <TEntity, object> >[] paths)
{
var include = new IncludePaths();
foreach (var item in paths)
{
include.Paths.Add(IncludePath.Create <TEntity>(item));
}
return(include);
}
public async Task LoadProperties <TEntity>(IEnumerable <TEntity> entities, IncludePaths paths, CancellationToken token = default(CancellationToken))
{
var meta = this.Model.GetEntityMetadata <TEntity>();
if (meta == null)
{
throw new ArgumentOutOfRangeException("TEntity", "The entity type is not part of the given MetadataModel.");
}
var keys = entities.Select(p => meta.GetEntityKey(p)).Distinct().ToList();
if (token.IsCancellationRequested)
{
return;
}
var service = await ServiceContext.Current.GetServiceAsync <TService>(token);
if (token.IsCancellationRequested)
{
return;
}
var response = await service.GetPropertyValuesAsync(keys, paths);
if (token.IsCancellationRequested)
{
return;
}
foreach (var item in response)
{
var entity = this.Model.GetEntityMetadata(item.EntityType);
var prop = entity.Properties.OfType <NavigationPropertyMetadata>().SingleOrDefault(p => p.Name == item.PropertyName);
if (prop == null)
{
throw new InvalidOperationException(string.Format("The NavigationProperty {0} could not be found on type {1}", item.PropertyName, item.EntityType));
}
if (prop.Multiplicity == NavigationPropertyMultiplicity.Many && prop.TargetNavigationProperty.Multiplicity != NavigationPropertyMultiplicity.Many)
{
foreach (var nav in item.Values.Select(p => p.Value))
{
foreach (var e in entities)
{
if (prop.TargetNavigationProperty.MatchForeignKeys(nav, e))
{
//TODO handle Null Value
prop.AddItem(e, nav);
}
}
}
}
else if (prop.Multiplicity == NavigationPropertyMultiplicity.Many && prop.TargetNavigationProperty.Multiplicity == NavigationPropertyMultiplicity.Many)
{
//TODO implement
}
else
{
foreach (var nav in item.Values.Select(p => p.Value))
{
foreach (var e in entities)
{
if (prop.MatchForeignKeys(e, nav))
{
prop.SetValue(e, nav);
}
}
}
}
}
}
public Task LoadProperties <TEntity>(TEntity entity, IncludePaths paths, CancellationToken token = default(CancellationToken))
{
return(LoadProperties <TEntity>(new[] { entity }, paths, token));
}