Category "entity-framework"

Get ID of item selected in ComboBox

I have a ComboBox that gets filled with items from my database. I'm trying to get the ID of the item that is selected in the ComboBox, but nothing I've tried se

Getting the result of a computed column from database into an entity

In a project using Entity Framework, say I have an entity such as [Table("MyTable")] public partial class MyTable { public string FirstName { get; set; }

Entity Framework rollback and remove bad migration

I'm using EF 6.0 for my project in C# with manual migrations and updates. I have about 5 migrations on the database, but I realised that the last migration was

Unable to update database to match the current model because there are pending changes

I have a project built in visual studio 2013 environment with the Db built using EF 5 code first. I have had my APIs working fine for a long time but all of a

Code first migration error "Implicit conversion from data type nvarchar(max) to varbinary(max) is not allowed"

I changed the data type of a field in my model from string to byte array and I got this error when I run Update-Database code first migration method. Implic

Entity Framework Core error "Column names in each table must be unique"

I have manually added the column IdCategory to my table Books, and now each time I try to run Update-Database, I get this error: fail: Microsoft.EntityFramewor

Enable-Migrations Exception calling "SetData" with "2" argument(s)

I created a library based on .NET 4.6.2 version. To the library, I've added the EntityFramework version 6.1.3 package. I created a model as follow using Syst

Select multiple columns using Entity Framework

Maybe an easy question, but can't find it easily so forgive me =) I try to select multiple columns. The statement I use is: var dataset2 = from recordset in en

Sorting a 1-to-many relationship for a log table for the most recent item

So I have a table, Equipments, that contains assets. There is a table connected to this one in a 1-many relationship that logs each time it is inventoried, by w

How can I use a built Expression in an Include .Where() to apply an Include Filter when it expects Expression but only allows Func?

I'm getting some errors trying to build expression trees on nested collections. I have classes: // not DB entity public FilterTerm { public string Compariso

Unable to create a controller when using asp.net MVC 4/Entity Framework.

I am new to asp.net, and I am now facing a problem. I have created a project using asp.net mvc4, and I have added an entity data model and successfully connect

Displaying an iframe with @Html.Raw is not working like when displaying Script with @Html.Raw

Note: This is written in asp.net mvc 5. That is the tech I am using for this. I am used to displaying certain data when I use @Html.Raw to show data from a Mode

Identity UserManager CreateAsync does not write to database

It doesn't give any errors or warnings but it doesn't insert in the database. Seems like it's only in memory. Also UserManager's FindByNameAsync can't check use

Why is not working EF Core retry on failure

I've configured my db context to retry on failure this way: optionsBuilder.UseSqlServer(connectionString, sqlServerOptionsAction: sqlOptions => {

EntityFramework in test initialization error: CREATE DATABASE statement not allowed within multi-statement transaction

I'm trying to build a quick test that deletes and recreates a database every time it runs. I have the following: [TestClass] public class PocoTest { priva

Could not find an implementation of the query pattern for source type 'System.Data.Entity.DbSet'

I'm using Entity Framework for the first time, but it seems not working as expected. I have this code: using System; using System.Collections.Generic; using S

EF code-first can there be multiple entities in DbUpdateConcurrencyException.Entries?

We are using EF 6.x with RefactorThis.GraphDiff; so that a related entity-tree is saved/updated using EF. We have added RowVersion for each table to capture t

Creating a Base Class for all entities in Entity Framework 5 in DB first approach

I have few properties like CreatedDate, ModifiedDate, VersionNo on every table. I need to change/ add values for these properties every time I modify the entity

Where to place business logic layer in relation to data access while providing unit testability by dependency injection?

I am looking for a way to have a separate layer of business logic in a MVC4 app with Entity Framework, without having to inject my (real or fake) database conte

Add new Required Field to one of table with EF Code First Migration

I am using EF Code First Migration. I already have lots of data on production Db and I would like to intorduce a non nullable field. How it could be possible?

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