I'm new to Entity Framework and adding a 'ADO.NET Entity Data Model' item to my Azure Function for a Database table and only two out of the four files I was expecting were generated automatically. Solution explorer screenshot below of what was created vs expectations. What I am I missing so the Entity Class and Context files will generate automatically?
I have Visual Studio version 16.11.5 installed and I am using Entity Framework version 6.4.4
What was created
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What I was expecting
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Figured this out. The problem I had was I was creating the Entity Model within my Azure Function. I created a separate .NET Framework Class Library and all the model files created as expected.
Related
I've made a project with Asp.net core, and i have some data in slq express. I want to add entity framework whit my existing database, but at the moment to add the model doesn't appears the model data, I tried installing NutGet packages and update them, but nothing.
Thats all that appears
I assume you're trying to add ado.net entity model. You can try to generate using the follwoing for .net core
Scaffold-DbContext "Server=(localdb)\mssqllocaldb;Database=Blogging;Trusted_Connection=True;" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models
Source: https://learn.microsoft.com/en-us/ef/core/get-started/aspnetcore/existing-db
I'm using Visual Studio 2017, v15.3.1 and am trying to follow a tutorial about creating some WebAPI endpoints with Entity Framework, as outlined here
In my case I'm using the good old Northwind SQL database instead of the author's blogging example, which I don't think should be an issue?
At any rate, when I get to the bit where I'm supposed to create a controller, I right-click the controllers folder in my solution, select 'API Controller with actions, using Entity Framework' and choose my EF model class (Orders, Employees, it doesn't seem to matter) and the Data Context which I generated successfully earlier in the tutorial.
When I select Add there's an attempt to scaffold, but I'm then told in a popup: There was an error running the selected code generator: 'No parameterless constructor defined for this object'.
I've looked at this error message online and others have had similar problems, but nothing they tried quite matches my scenario, and their solutions haven't fixed this issue.
My generated EF model classes do have parameterless constructors defined, so I'm not sure what the error is referring to?
I have an Entity Framework 6 code first application. As a one-off, I want to add a entity class based on a table that has been added externally to the database originally generated from the code first application. I know how to do this manually, but I wondered if there is a tool or method that could generate the class for me.
You can make a new project, right click on it -> Add new item -> ADO.NET Entity Data Model -> Database first
Then let entity framework generate models for your database and just copy the one you need to your project. That's probably the easiest solution :)
I am having a few problems with updating the model in EF using Model First.
I have exhausted my efforts with the suggestions of adding migrations (which is normally done using Code First).
The Package Manager Console prints the message
Creating a DbModelBuilder or writing the EDMX from a DbContext created using Database First or Model First is not supported. EDMX can only be obtained from a Code First DbContext created without using an existing DbCompiledModel.
I have also tried this suggestion
Updating model in EF Database First project
However nothing happens when i click "Run Custom Tool"
Any suggestions please on how to update the model to reflect the changes that have been added to the database.
Open your model
right click and you will find an option Update Model from database
Click update model from database than a window will open like this:
So choose the modified table to update them in model.
Can anybody get ASP.NET Dynamic Data Entities Web project working under EF 6.0.2 and .NET 4.5 in Visual Studio 2013?
I find problems in ManyToMany_Edit.ascx.cs and Global.asax.cs all relating to the switch in namespace for ObjectContext. Changing the using statements in the generated files is not enough. In other words, following this guide is not enough.
System.Web.DynamicData.dll doesn't seem to be aware of System.Data.Entity.Core.Objects.ObjectContext.
Have you read this post? http://blogs.msdn.com/b/webdev/archive/2014/02/28/announcing-the-release-of-dynamic-data-provider-and-entitydatasource-control-for-entity-framework-6.aspx , this works for me