poco

问题 I'm using the CTP4 code first EF framework, but I'm having problems getting lazy loading to work. Reading up on it, it should be simple, but it's just not public class Folder { public int Id { get; set; } public string Name { get; set; } public int? ParentFolderId { get; set; } public virtual IList<Folder> ChildFolders { get; set; } } In the model configuration: HasMany(f => f.ChildFolders).WithOptional().HasConstraint((child, folder) => child.ParentFolderId == folder.Id); However, when I do

问题 I am using Entity Framework with POCO objects and have the following scenario: I create a new parent object and add a child object to it. Then I save changes and detach the parent object. At this moment its children collection gets empty. parent = new Parent() { label = "Test" }; parent.Children.Add(new Child() { label = "Test" }); context.Parents.AddObject(parent); context.SaveChanges(); context.Detach(parent); When I reattach the parent object to a different context, I have to explicitly

问题 Sometimes i would like to serialize dynamic properties to one field in database and lazy deserialize field to dynamic properteis in object view, see following in object view: public IDictionary<string, string> _properties; public IDictionary<string, string> Properties { get { if (_properties == null) { _properties = new Dictionary<string, string>(); Deserialize(_properties, PropertyString); } return _properties; } } I know how to do it in ef 3.5. I add entity self intercept function when

问题 Is it possible to auto generate the POCO classes and the mapping with the database defined separately using Fluent API (instead of annotations) for an existing database? Instead of coding all these entity classes manually, I find it easier if they are auto generated and then I can change them as required if the names are not incorrect (plural or singular) or the some of the relationships are not correctly mapped etc. This will save lot of time for me compared to coding all the entity classes

问题 I'm creating a Compact Framework 3.5 application, which is the client side of an older Java webapp. The communication protocol between both sides is REST+JSON. Serialization of the POJOs to JSON is not a matter since the POJOs already exist. But instead of rewriting from scratch a C# version of all the POJOs sources to be able to deserialize the JSON client-side, I would prefer a generation using some tools. Or at least, do the conversion manually with a "standardized" method. Do you know

问题 I'm having trouble writing to an Azure Block Blob from C++ using a SAS (Shared Access Signature). I'm using the Blob REST API and Poco. The HTTP request returns error 404 (resource does not exist), but I can't figure out what I'm doing wrong. I generate the SAS on the server in C# like this (seems to work fine): CloudStorageAccount storageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString")); CloudBlobClient blobClient = storageAccount

问题 I am using EF4.1, and for performance issues I need to select only a few fields from a DbSet which is mapped to a view on the sql server. Any ideas about how to do that? so selecting fields from Customer would return the below error. var result = context.Customers.Select(c => new Customer{ Name = c.Name,Age = c.Age}).ToList(); The entity or complex type 'Customer' cannot be constructed in a LINQ to Entities query. at System.Data.Objects.ELinq.ExpressionConverter.CheckInitializerType(Type type

问题 I am struggling to find a way to make POCOs work with Linq-to-Sql when my domain model is not table-driven - meaning that my domain objects do not match-up with the database schema. For example, in my domain layer I have an Appointment object which has a Recurrence property of type Recurrence. This is a base class with several subclasses each based on a specific recurrence pattern. In my database, it makes no sense to have a separate AppointmentRecurrences table when there is always a one-to

问题 In my project I have following DomainModel. public class Login { public Guid Id { get; set; } public Login CreatedBy {get; set; } } I am using fluent configuration as below: modelBuilder.Entity<Login>() .HasKey(x => x.Id) .ToTable("Login"); modelBuilder.Entity<Login>() .HasOptional(x => x.CreatedBy) .WithMany() .HasForeignKey(x => x.CreatedBy); My code in repository to get all Logins data is as below: return from d in Db.Logins.Include("CreatedBy") select d; When I execute the code I am

问题 I am working with ASP.net MVC5 Application and with EF 5 Model first approach. But also used poco classes, which is in another C# project called "Entity". I am having multi-tier architecture where Edmx file is in DAL layer and BAL is having reference of it and BAL and Entity Project are referenced in main web project. Everything works well but after setting up the database and project on Azure when my site tries to connect database it throws below error "MetadataException: Unable to load the