self-tracking-entities

问题 I've got a GridView on a ASP.Net page. I would like to set the DataSource of the Gridview to a trackable collection of Entity Framework objects. I though the code should look like this: this.gvMyGridView.DataSource = entity.MyDetailedItems; this.gvMyGridView.DataBind(); But this doesn't display any data. I am using self tracking entities and the MyDetailedItems is a navigation property to rows from another table. 回答1: EF 4 with self tracking entities does not support lazy loading so you must

问题 How I can clone a Self-Tracking Entity Graph in EF 4.0? Thanks 回答1: Self tracking entities are serializable so the simplest way to get deep clone of the entity (deep clone = clone of the graph) is to use DataContractSerializer and serialize and immediately deserialize it. Deserialized entity will be your clone of the graph. 回答2: When you say "clone", do you mean to create a new entity that will be persisted, or to just create another "transient" entity that is an in-memory copy of the same

问题 Hi I have a silverlight4 + .net 4.0 application where i am using self tracking entities. In the application i have a silverlight project which contains the entities generated by EF self tracking template. This project is being shared by the wcf service and the client so that the change tracking works. everything builds fine but when i run my service is get the exception Could not load file or assembly 'System.Runtime.Serialization, Version=2.0.5.0, Culture=neutral, PublicKeyToken

问题 I want to know if DBContext (EF 4.1) supports Self Tracking Entities. If yes, how can I do that? 回答1: No unless you rewrite the template to support them. The current template is dependent on ObjectContext API. 来源： https://stackoverflow.com/questions/6646281/can-i-use-self-tracking-entities-and-dbcontext-in-entity-framework-4-1

问题 Can someone point me the difference between POCO , Self Tracking Entities , POCO Proxies? Actually, I am working Entity Framework 4.0 and POCO(Repository Pattern) and whenever I do some changes in the POCO and call ObjectContext.Savechanges then it reflects to the DB. My question is, How does the Context persist the change to the DB since it is not tracked? Does the Context generates the tracking info on the fly for POCO? Sample Code I am using, IEFRepository<Category> catRepository = new

问题 I am sure most of .NET developers must be facing this issue one way or the other. The problem is simple, I am upgrading my project from .NET 4 to .NET 4.5.1 . So far so good the upgrade went neatly. But when I upgraded from EF4 to EF6, I did encounter lot of bugs in my queries. Some of these were related to renaming the context which I did, but as for the errors related to Self-tracking entities , I am a little confused. Self-tracking entities are a major part of my project and EF6 not

问题 I'm trying to ramp up on the entity framework so I don't feel like I'm in the dark ages. I tried (and have thus far failed) to intuit from generated code what the essential differences between the available code generation items. It seems POCO isolates the entity data structures from the ojbect that moves them in/out of a datastore. I'm not sure what a "Self-Tracking Entity" is. I'm guessing the tracking part refers realizing the so called "unit of work" pattern, but I'm not posative. And

问题 Reading the msdn information on EF 5.0 and n-tier solutions see link , it seems that MS is not recommending STE's and the POCO/DTO way is also not recommended by stating that it is difficult. Not all (perhaps not many?) applications are suited for using WCF Data Services. So what is the way to go? My scenario is a current, large server (WebServices) application with many clients (only our own), mostly WinForms. Today DataSets are used to ship the data and track changes into the SQL Server

问题 I have to recalculate values on a large collection of entities, one after the other. During that process, all the self-tracking-entities are altered within the same ObjectContext. For each entity that needs to be processed, small amounts of data has to be fetched from the database. That results in a lot of the same SQL query but using different parameters. I am using Solutions Design's ORM Profiler software to profile the queries that are sent to the database. The queries themselves seems

问题 I have a client application that downloads a number of STE's via WCF. Using a WPF application, users can select an entity from a ListBox, and edit it via a popup UserControl. As the UserControl is bound directly to the object, when a user makes a change it of course affects the object. I would like to provide a Cancel function which will undo all changes made to the entity. Any thoughts? 回答1: You can keep a original copy of the entity. And edit a cloned version of it. If the user cancels the