What effect(s) can the virtual keyword have in Entity Framework 4.1 POCO Code...
So far, I know of these effects. Lazy Loading: Any virtual ICollections will be lazy-loaded unless you specifically mark them otherwise. More efficient change tracking. If you meet all the following...
View ArticleThe specified type member is not supported in LINQ to Entities. Only...
You cannot use properties that are not mapped to a database column in a Where expression. You must build the expression based on mapped properties, like: var date = DateTime.Now.AddYears(-from);...
View ArticleEntity Framework: Where do I extend the CSDL/MSL?
I will take it little bit deeply because model defined functions are not very well known. Model defined functions must be manually added to CSDL part of EDMX file. You must open file as XML and add a...
View ArticleEntity Framework Simple Generic GetByID but has differents PK Name
Here is example of base repository class for repositories build for entity with single property key. The GetByKey method is independent on key name or type. using System; using System.Data; using...
View ArticlePossible to default DateTime field to GETDATE() with Entity Framework...
You can use DateCreated = c.DateTime(nullable: false, defaultValueSql: "GETDATE()") Usage: public partial class MyMigration : DbMigration { public override void Up() { CreateTable("dbo.Users", c =>...
View ArticleHow to convert DbSet in Entity framework to ObjectQuery
I found the answer. Of course, it is possible to convert DbSet in Entity framework to ObjectQuery using the below lines of code. ObjectContext objectContext =...
View ArticleEntity Framework 4: Does it make sense to create a single diagram for all...
Having one big EDM containing all the entities generally is NOT a good practice and is not recommended. Using one large EDM will cause several issues such as: Performance Issue in Metadata Load Times:...
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Entity Framework: Set Delete Rule with CodeFirst
What you are looking for can be achieved by setting up an optional association between Guest and Language entities: protected override void OnModelCreating(ModelBuilder modelBuilder) {...
View ArticleEntity Framework many-to-many self-reference
Ok, so because a lot of people answered this ;), I searched a little more and I found the solution for my case. The entity looks like: public class User { public int ID { get; set; } public string...
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