entity-framework-6

问题 Edit This seems to occur for any Entity property that references another entity in one direction. In other words, for the below example, the fact that Bar overrides Equality appears to be irrelevant. Suppose I have the following classes: public class Foo { public int? Id { get; set; } public virtual Bar { get; set; } } public class Bar : IEquatable<Bar> { public int Id { get; set; } public override bool Equals(object obj) { var other = obj as Bar; return Equals(other); } public bool Equals

问题 I have an asp.net solution using entity framework 6 to mysql server. now I have to work on that solution on a new machine, but I have some problems: 1) when building the solution I get error: "The ADO.NET provider with invariant name 'MySql.Data.MySqlClient' is either not registered in the machine or application config file". App.config: <entityFramework> <providers> <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6,

问题 I have an entry removal problem with the EntityFramework and a many-to-many relationship for the same entity. Consider this simple example: Entity: public class UserEntity { // ... public virtual Collection<UserEntity> Friends { get; set; } } Fluent API Configuration: modelBuilder.Entity<UserEntity>() .HasMany(u => u.Friends) .WithMany() .Map(m => { m.MapLeftKey("UserId"); m.MapRightKey("FriendId"); m.ToTable("FriendshipRelation"); }); Am I correct, that it is not possible to define the

问题 I'm trying to debug a StackOverflow in the EntityFramework NuGet package (version 6.1.3). In order to see the stack frames I need the PDB file for EntityFramework.DLL and EntityFramework.SqlServer.DLL. However, I can't seem to get Visual Studio to download this from either the MSFT symbol sources or from SymbolSource.org (I can get other System PDBs and things like NewtonSoft.json). Are the EF PDBs available anywhere? 回答1: Now with pictures (as it took me about an hour of trial and fail) Get

问题 I am not sure if what I am doing is possible. I have 2 methods. The body of the 2 methods are exactly identical, however the signature of the method both parameter and return are different. The passed in parameter's properties are changed and the object are different but have the same property name (They are two different Entity Framwork Entities). Inheriting both from a base object is not possible (i think) because these are Entity Framework Entities. Best to show example then talk about it.

问题 This question was asked here 4 years ago: EF Mapping to prefix all column names within a table I'm hoping there's better handling these days. I'm using EF6 Fluent API, what I'll call Code First Without Migrations. I have POCOs for my models, and the majority of my database column names are defined as [SingularTableName]Field (e.g., CustomerAddress db column maps to Address field in Customers POCO) Table: CREATE TABLE dbo.Customers ( -- ID, timestamps, etc. CustomerName NVARCHAR(50),

问题 Could Someone help me to clarify the difference between : var query = awlt.People.Include(p => p.EmailAddresses) .Where(p => p.LastName.Equals(lastName)) .SelectMany(a => a.EmailAddresses) .Select(a => a.EmailAddress1); var query = awlt.People .Where(p => p.LastName.Equals(lastName)) .SelectMany(a => a.EmailAddresses) .Select(a => a.EmailAddress1); I get the same results in both cases without knowing the difference . Does the Eager Loading require using Include ? 回答1: The both query are

问题 I am using Entity Framework 6.x using the Code First approach on an MVC 5 application. In this particular situation my model (among other things) contains two properties named Latitude and Longitude: [Required, Range(-90, +90)] public decimal Latitude { get; set; } [Required, Range(-180, +180)] public decimal Longitude { get; set; } And when I performed the migration I got something like this CreateTable("ResProperty"), c => new { : Latitude = c.Decimal(nullable: false, precision: 10, scale:

问题 I realise that this has been asked a number of times but I just can't seem to get the bottom of my issue. I'm getting the following error stack: When I reflect out my dll I can see the following Reading http://blogs.teamb.com/craigstuntz/2010/08/13/38628/ it suggests I'd expect to see the csdl, msl and ssdl files here, but they're not. They do exist here obj\Debug\edmxResourcesToEmbed though. Never-the-less I tried to explicitly tell the web.config where to look by doing this: ..

问题 I believe Entity Framework 6 is intended for .NET 4.5. I'm wanting to use it for a Visual Studio 2010 project, so .NET 4.5 isn't available. Does it support .NET 4.0 and hence Visual Studio 2010? 回答1: Entity Framework 6 does support .NET 4.0. You should update your version of NuGet then try again. You can find the download at http://www.nuget.org/. I successfully downloaded EntityFramework 6.0.0-rc1 from the main nuget.org feed from an application targeting .NET 4.0 回答2: Entity Framework