My project does not add reference to another in the same solution.
I created a project for a website and and abstracted all the parts of the program into .Net Class Libraries (My models in a different class library, Interfaces in a different class library, business logic in a different class library). I referenced all the projects correctly and I also tried creating something I call EntityRepository which I initially kept the DbContext inside. But due to the reason that I wanted to use Microsofts' implementation of Identity and then scaffold the logic out, I could not find the DbContext from the other project which is required when scaffolding so I had to exclude that project out of the solution. Normally when you create a project and select Single user authentication, .Net core adds an initial DbContext into the project. So when scaffolding the implementation of AspNetCore Identity into my project, i have to choose the DbContext. Because of that, my business logic has broken into two sides. The other logic is inside another project in the same solution, the Identity and authentication is inside the startup project which is the web application. When I tried calling the services which implement the business logic from the other project into the web project, it could not add reference to the services project. I now added reference manually. After that I now saw an error written
Detail Error:
Severity Code Description Project File Line Suppression State
Error NU1108 Cycle detected.
CBTSoftware.Web.Host -> CBTSoftware.Services -> CBTSoftware.Web.Host. CBTSoftware.Web.Host C:\Users\Tavershima\source\repos\CBTSoftware\CBTSoftware.Web.Host\CBTSoftware.Web.Host.csproj 1```
How can I resolve this?
Fist I want to show gratitude to those who answered above because they put on the right track to solving this issue. In my case the issue was caused by untrack files causing NU1108 and was resolved by running git clean -fxd
*git clean documentation
I know that this is old but I'd like to add here as well.
I had the same situation as Sebastian Widz answer but what really worked for me was opening the Properties of the problematic project.
This reloaded the project files/dependencies and fixed the "Cycle Detected" issue.
In my case the problem had nothing to do with actual dependencies.
One day I opened a solution (which was fine the day before) and could not compile it. NU1108 Cycle detected error was reported in error log for several projects.
Solution:
Examine all projects in the solution, check the solution content.
If for some projects you see wrong content like if the project had files attached from a different project, expand its nodes and wait a bit, VS should refresh the nodes after a while
You may also try to Clean Solution and Reload each project.
Consider making a project to contain your EntityRepository, like CBTSoftware.Data, and adding a reference to it from your services project:
CBTSoftware.Services -> CBTSoftware.Data
Then, you can continue referencing your services project from your web project:
CBTSoftware.Web.Host -> CBTSoftware.Services
You'll still be able to configure your EntityRepository in your Startup.cs file because it will know about your CBTSoftware.Data project transitively. Just make sure to remove the reference to your web project from your services project, since this is creating a cycle.
I have solved the problem by deleting the DbContext which i created in the Web Project and using the one which I created in another project which is a .Net Library then I added this line of code in my StartUp.cs file
services.AddDbContext<CBTDbContext>(options =>
options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
By adding it, I was able to find the DbContext in the Web Project.
Then another problem has arisen when I'm trying to add migrations. Which I would open in another post
I also had this issue
In my case, I was using multiple projects in one solution. And in one of those projects, it's Dependencies was showing warning signs, within these Dependensies, there was a folder with included projects also each showing a warning sign.
I could solve it by right-clicking on the Dependencies, click on 'Add Project Reference' and then unselect all projects related to it/showing the warning signs.
After rebuilding, the cycle problem was gone.
I am trying to work on an asp.net project and am having some issues that I don't understand how to fix.
I am new to ASP.NET and am learning step by step.
I have watched some courses on Lynda as well as Pluralsight and wanted to try creating a full project.
I was told by the person teaching me to separate my project into 3 layers
Data Layer
View Layer
Service Layer
So after creating the project, I right clicked on my solution and added 2 new class libraries for the data and service layers.
Then I tried to move the code int the Models folder from the View Layer > Data Layer, and my project started showing errors and not compiling ( I assume from missing all the entity framework references).
Then I tried click References on my Data Layer library > add Reference and referencing the view layer.
That didn't work.
Then, I installed visual studio productivity power tools 2017 to enable the power commands section for copying references.
Then I went to the view layer, copy references and tried pasting into the data layer, and it generated an error saying:
Error HResult E_Fail has been returned from a call to a COM component.
I know when I did the project as 1 layer and I did enable-migrations and update-database all would work, and I assume I have to do that after I get my data layer working.
Is there anything I am doing wrong or incorrectly.
Thanks,
Deleting csproj.user files of all the projects should fix this issue.
I have a VS 2017 solution with 2 .Net Core 1.1 projects, 1 is just a class library containing all of my domain models and the other is the actual MVC web application containing the contexts (the ApplicationDbContext & one I created) & all of the EFCore assemblies. I'm trying to enable & use migration on the context I created but having trouble being that the context is in the WebUI project and the models are in the class project. Upon 1st execution of Add-Migration command, I got this error about my target project didn't match my migrations assembly, so I figured out how to get around that by changing the migration assembly in Startup.cs. Add-Migration ended up working but the migration file was created in the class project where the EFCore assemblies are not referenced, thus giving an error on the migration file. I thought maybe I'd try and trick it by moving the file to my WebUI project to update the database, but then figured that may not work & there has to be an easier way of doing this. Does anyone know how to setup code first migrations for EFCore to keep track of modifications and update the database when my domain models are in another project? Any help would be greatly appreciated. Hopefully this isn't too vague. If more info is needed, I'll be all too happy to post. Thanks.
I may not be understanding the question correctly, but have you tried referencing your domain project in your webUI?
I have just created a ASP.NET web API project with Visual Studio 17 and I have created a Class Library to connect it to an SQL database I created. the problem is when I try to create a controller in the project, I get the error,
There was an error running the selected code generator: could not load file 'ClassLibrary.dll' or one of it's dependencies. this system could not find the file specified.
Does anyone what the problem could be. I have looked at the folder where the said file should be contained in the ClassLibrary and it is empty.
I gather that it might be from my Entity Framework, I am using ADO.Net Entity Data Model.
For ASP.NET web API project no need to add Class Library:
Just right click in Solution and add ADO.net Model
Configure with Database
Add required Database Tables
Build solution
First you have to add reference of your class library project if you don't then just give a built to your project in which you added a reference of class library project, then try to create a controller it will definitely help you....
I have a solution where there are following projects:
a context and entities developed under code-first approach.
A class library that present some business objects. the objets are using the EF context and its object for a DataAccess needs.
The solution has unit test of the business objects
I am able to execute my unit test successfully.
Now I have added a MVC 5 project where I would like to inject my business object. I have created a controller and view and put the same peace of code which has been passed in one of my unit test and also added the project web config proper entity framework and connnection strings sections. When I am executing the code I am facing the follwing error:
Migrations is enabled for context 'DatabaseContext' but the database
does not exist or contains no mapped tables. Use Migrations to create
the database and its tables, for example by running the
'Update-Database' command from the Package Manager Console.
When I am debugging my code I see that I am getting throug theese instructions
Database.SetInitializer(new ModelContextStrategy());
and
public Configuration()
{
AutomaticMigrationsEnabled = true;
}
but still my result is negative, although everething works fine in my unit testss...
in case I am doing the unit tests first the db is get created and all unit test are through, and then I am starting the MVC application I am getting:
The model backing the 'DatabaseContext' context has changed since the
database was created. Consider using Code First Migrations to update
the database
What I am missing or doing wrong? (specific nuget packages installation for the mvc project? )
the problem was solved as soon a I enabled the entity framework for my MVC project
Install-Package EntityFramework -Version 6.1.0