Hi I was wondering if EntityReference.Load method includes
If Not ref.IsLoaded Then ref.Load()
My question is basically:
Dim person = Context.Persons.FirstOrDefault
person.AddressReference.Load()
person.AddressReference.Load() 'Does it do anything?
It does Load again. I verified this by Profiler and it shown two queries. Default merge option is MergeOption.AppendOnly and it doesn't prevent from querying again. Code from Reflector:
public override void Load(MergeOption mergeOption)
{
base.CheckOwnerNull();
ObjectQuery<TEntity> query = base.ValidateLoad<TEntity>(mergeOption, "EntityReference");
base._suppressEvents = true;
try
{
List<TEntity> collection = new List<TEntity>(RelatedEnd.GetResults<TEntity>(query));
if (collection.Count > 1)
{
throw EntityUtil.MoreThanExpectedRelatedEntitiesFound();
}
if (collection.Count == 0)
{
if (base.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.One)
{
throw EntityUtil.LessThanExpectedRelatedEntitiesFound();
}
if ((mergeOption == MergeOption.OverwriteChanges) || (mergeOption == MergeOption.PreserveChanges))
{
EntityKey entityKey = ObjectStateManager.FindKeyOnEntityWithRelationships(base.Owner);
EntityUtil.CheckEntityKeyNull(entityKey);
ObjectStateManager.RemoveRelationships(base.ObjectContext, mergeOption, (AssociationSet) base.RelationshipSet, entityKey, (AssociationEndMember) base.FromEndProperty);
}
base._isLoaded = true;
}
else
{
base.Merge<TEntity>(collection, mergeOption, true);
}
}
finally
{
base._suppressEvents = false;
}
this.OnAssociationChanged(CollectionChangeAction.Refresh, null);
}
Just for reference for anyone else finding the accepted answer, here is the extension method I created for my current project.
using System.Data.Objects.DataClasses;
namespace ProjectName
{
public static class EntityFrameworkExtensions
{
public static void EnsureLoaded<TEntity>(this EntityReference<TEntity> reference)
where TEntity : class, IEntityWithRelationships
{
if (!reference.IsLoaded)
reference.Load();
}
}
}
And usage:
Patient patient = // get patient
patient.ClinicReference.EnsureLoaded();
patient.Clinic.DoStuff();
Related
I am a decades-old C programmer. Unity is my first foray into modern C and I find myself pleasantly surprised - but some of the subtleties of the language have escaped me.
First a technical question: What is the right way to store a Unity Object in a generic class? In the example below I get the following error:
Assets/scripts/MediaTest.cs(49,44): error CS0030: Cannot convert type `UnityEngine.Texture2D' to `T'
Second the real question: What is a better approach to loading a set of textures?
Thanks in advance for your help
/*
* MediaTest.cs
*
* Pared down generic class test
*
*/
using System.Collections; // Load IEnumerable
using System.Collections.Generic; // Load Dictionary
using System.Text.RegularExpressions; // Load Regex
using UnityEngine; // Load UnityEngine.Object
public class MediaTest<T> : IEnumerable where T : UnityEngine.Object {
private Dictionary<string, MediaContent> _dict =
new Dictionary<string, MediaContent>();
private class MediaContent {
public string path { get; set; }
public T item { get; set; }
public MediaContent(string path, T item) {
this.path = path;
this.item = item;
}
}
// Indexer to return a UnityEngine.Object by filename
public T this[string name] {
get { return (T)_dict[name].item; }
}
// Convert a path to just the filename
public string Basename(string path) {
return new Regex(#"^.*/").Replace(path, "");
}
// Iterate through the filenames (keys) to the stored objects
public IEnumerator GetEnumerator() {
foreach (string name in _dict.Keys) {
yield return name;
}
}
// Read in the Resource at the specified path into a UnityEngine.Object
public void Load(string path, bool load=false) {
string name = Basename(path);
if (this.GetType() == typeof(Media<Texture2D>) && IsStill(name)) {
T item = (load) ? (T)Resources.Load<Texture2D>(path) : null;
_dict[name] = new MediaContent(path, item);
return;
}
if (this.GetType() == typeof(Media<AudioClip>) && IsAudio(name)) {
T item = (load) ? (T)Resources.Load<AudioClip>(path) : null;
_dict[name] = new MediaContent(path, item);
return;
}
}
// The real code uses Regex.Match on the file extension for supported types
public bool IsStill(string name) { return true; }
public bool IsAudio(string name) { return true; }
}
Here is the working code with updates from the comments. Thanks derHugo!
public void Load(string path, bool load=false) {
// Translate the filesystem path to a Resources relative path by removing both
// The */Resources prefix and the filename extention
Regex re_path = new Regex(#".*/Resources/");
Regex re_ext = new Regex(#"\.\w+$");
string relpath = re_ext.Replace(re_path.Replace(path, ""), "");
// Create an asset name from the path
string name = System.IO.Path.GetFileName(relpath);
// Skip this file if it doesn't match our type
if ( (typeof(T) == typeof(Texture2D) && IsStill(path)) ||
// (typeof(T) == typeof(Video) && IsVideo(path)) ||
(typeof(T) == typeof(AudioClip) && IsAudio(name))) {
T item = (load) ? Resources.Load(relpath) as T : null;
_dict[name] = new MediaContent(path, item);
}
}
We have migrated MongoDB drivers from v1.9.3 to v2.4.0. we have used BsonBaseSerializer, which does not exists in v2.4.0. what is the replacement of BsonBaseSerializer in v2.4.0?
There's not really enough of a question to give a full answer to, but the change you're looking for is documented under serialization in the mongo docs.
http://mongodb.github.io/mongo-csharp-driver/2.4/reference/bson/serialization/#implementation-1
The biggest change being that they take a type now on the base class.
So
V1 Driver code
public class IntegerCoercion : BsonBaseSerializer
{
public override object Deserialize(BsonReader bsonReader, Type nominalType, Type actualType, IBsonSerializationOptions options)
{
if (bsonReader.CurrentBsonType == BsonType.Int32)
{
return bsonReader.ReadInt32();
}
if (bsonReader.CurrentBsonType == BsonType.String)
{
var value = bsonReader.ReadString();
if (string.IsNullOrWhiteSpace(value))
{
return null;
}
return Convert.ToInt32(value);
}
bsonReader.SkipValue();
return null;
}
public override void Serialize(BsonWriter bsonWriter, Type nominalType, object value, IBsonSerializationOptions options)
{
if (value == null)
{
bsonWriter.WriteNull();
return;
}
bsonWriter.WriteInt32(Convert.ToInt32(value));
}
}
V2 Driver Code
public class IntegerCoercion : SerializerBase<object>
{
public override object Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
if (context.Reader.CurrentBsonType == BsonType.Int32)
{
return context.Reader.ReadInt32();
}
if (context.Reader.CurrentBsonType == BsonType.String)
{
var value = context.Reader.ReadString();
if (string.IsNullOrWhiteSpace(value))
{
return null;
}
return Convert.ToInt32(value);
}
context.Reader.SkipValue();
return null;
}
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, object value)
{
if (value == null)
{
context.Writer.WriteNull();
return;
}
context.Writer.WriteInt32(Convert.ToInt32(value));
}
}
Not a huge difference but as with most of the driver changes they're minimal but breaking.
I am trying to inject dependencies into a Web Api Controller.
I created an own IHttpControllerActivator class and replaced the default one in lobalConfiguration.
public class SimpleASPWebAPIContainer : IHttpControllerActivator
{
private readonly CompositionContainer container;
public SimpleASPWebAPIContainer(CompositionContainer compositionContainer)
{
container = compositionContainer;
}
public IHttpController Create(System.Net.Http.HttpRequestMessage request, System.Web.Http.Controllers.HttpControllerDescriptor controllerDescriptor, Type controllerType)
{
if (controllerType != null)
{
var export = container.GetExports(controllerType, null, null).FirstOrDefault();
IHttpController result = null;
if (null != export)
{
result = export.Value as IHttpController;
}
else
{
//result = base.GetControllerInstance(requestContext, controllerType);
//container.ComposeParts(result);
}
return result;
}
else
{
return null;
}
}
public void Dispose()
{
if (container != null)
container.Dispose();
}
}
var apiSimpleContainer = new SimpleASPWebAPIContainer(container);
System.Web.Http.GlobalConfiguration.Configuration.Services.Replace(typeof(IHttpControllerActivator), apiSimpleContainer);
But when the client app is calling a controller method the IHttpControllerActivation Create method is not invoked.
Anybody can help me?
It was a very silly mistake.
public void Configuration(IAppBuilder app)
{
HttpConfiguration config = new HttpConfiguration();
ConfigureOAuth(app);
MefConfig.RegisterMef(config);
WebApiConfig.Register(config);
app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
app.UseWebApi(config);
AutoMapperConfig.InitAutoMapper();
}
I should have to used the new HttoConfiguration instance to replace default IHttpControllerActivator instead of System.Web.Http.GlobalConfiguration.Configuration.
I'm experiencing a problem when D&D a custom object from Swing to JavaFX and I'm wondering if I'm doing something wrong or its probably a Java FX bug.
My Transferable has been defined as the following:
public class TransferableEmployee implements Transferable {
public static final DataFlavor EMPLOYEE_FLAVOR = new DataFlavor(Employee[].class, "Employee");
public static final DataFlavor DEFINITION_FLAVOR = new DataFlavor(PropertyDefinition[].class, "Definition");
private static final DataFlavor FFLAVORS [] = {EMPLOYEE_FLAVOR, DEFINITION_FLAVOR};
private Employee[] employees;
private PropertyDefinition[] propertyDefinitions;
public MintTransferableEmployee(Employee[] employees, PropertyDefinition[] propertyDefinitions) {
this.employees = employees != null ? employees.clone() : null;
this.propertyDefinitions = propertyDefinitions != null ? propertyDefinitions.clone() : null;
}
public DataFlavor[] getTransferDataFlavors() {
return FFLAVORS.clone();
}
public Object getTransferData(DataFlavor aFlavor) throws UnsupportedFlavorException {
Object returnObject = null;
if (aFlavor.equals(EMPLOYEE_FLAVOR)) {
returnObject = employees;
}
else if(aFlavor.equals(DEFINITION_FLAVOR)){
returnObject = propertyDefinitions;
}
else{
throw new UnsupportedFlavorException(aFlavor);
}
return returnObject;
}
public boolean isDataFlavorSupported(DataFlavor aFlavor) {
boolean lReturnValue = false;
for (int i=0, n=FFLAVORS.length; i<n; i++) {
if (aFlavor.equals(FFLAVORS[i])) {
lReturnValue = true;
break;
}
}
return lReturnValue;
}
}
I've created an imageView (FX Component) where I added the setOnDragOver just as the following:
employeePhotoImageView.setOnDragOver(new EventHandler<DragEvent>() {
#Override
public void handle(DragEvent event) {
System.out.println("dragOver");
event.getDragboard().getContentTypes();
event.getDragboard().getContent(DataFormat.lookupMimeType("application/x-java-serialized-object"));
}
});
The getContentTypes() returns a Map with [[application/x-java-serialized-object]], so now I try to get the Content, and this only returns the List of PropertyDefinition but no Employee at all (which in this case, is the one I need).
If I remove the data of the PropertyDefinition in the transferable, the employee is returned in the getContent(DataFormat) method.
For me, this means that JavaFX only works with 1 DataFlavor or somehow it is only returning the last flavor found in the Transferable.
Any clues on this?
Thanks in advanced...
I have a generic repository for my Entities, all my entities (generated by the Code generation Item) have a personalized partial that implements an IID interface, at this point all of my entites must have a Int32 Id property.
So, my problems is with the update, here is my code
public class RepositorioPersistencia<T> where T : class
{
public static bool Update(T entity)
{
try
{
using (var ctx = new FisioKinectEntities())
{
// here a get the Entity from the actual context
var currentEntity = ctx.Set<T>().Find(((BLL.Interfaces.IID)entity).Id);
var propertiesFromNewEntity = entity.GetType().GetProperties();
var propertiesFromCurrentEntity = currentEntity.GetType().GetProperties();
for (int i = 0; i < propertiesFromCurrentEntity.Length; i++)
{
//I'am trying to update my current entity with the values of the new entity
//but this code causes an exception
propertiesFromCurrentEntity[i].SetValue(currentEntity, propertiesFromNewEntity[i].GetValue(entity, null), null);
}
ctx.SaveChanges();
return true;
}
}
catch
{
return false;
}
}
}
Someone can help me? this driving me crazy.
You can use the EF API to update the values of an entity as follows.
public static bool Update(T entity)
{
try
{
using (var ctx = new FisioKinectEntities())
{
var currentEntity = ctx.Set<T>().Find(((BLL.Interfaces.IID)entity).Id);
var entry = ctx.Entry(currentEntity);
entry.CurrentValues.SetValues(entity);
ctx.SaveChanges();
return true;
}
}
catch
{
return false;
}
}