I have two projects—let us say ProjectA and ProjectB.
Project A is already in production, but I need to add a functionality. I do not want to include it in ProjectA for security reasons, and also I have to create a separate domain for this functionality. But I want the two to use the same database.
My question are below:
how do I use the model in ProjectA in ProjectB.
I am using a CodeFirst approach; I hope running ProjectB will not lead to data migration on ProjectA.
In the web.config, which database connection will be referenced?
Thank you for the anticipated assistance.
I need to manage multiple context in the same project with different connection strings, I'm using EF Core Power Tools, but this tool it's generating a file config for whole project, worth noting that I'm working with Database First and separeting the entities from dbcontext in another class library project.
Assign a unique name to the config file according to the pattern described here: https://github.com/ErikEJ/EFCorePowerTools/wiki/Reverse-Engineering#using-multiple-dbcontexts-in-the-same-project
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 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'm working on an MVC 3 project. I was told to get all the models and viewmodels out of the projects and put them in a class library so that they can be referenced from different types of projects. However, now that I've transferred all the viewmodels and models from the web project to a class library, and removed all the references to the web project, I cannot set reference to the class library from my web project with the reason stated in the question title. WHy is this happening? In my class library I'm not referencing the main project anywhere!!! Any suggestions? Thanks a lot!!
Experienced this earlier. Check the project that you are going to add if it has the reference to the project you are adding in it.
Example: Project A with reference to Project B. Then in Project B, you're adding Project A as reference.
well this usually happens for a reason, and this is that there is a cirrular reference,maybe not a direct one but an indirect one (through third project, how many projects do you have in your solution?).
In your library project remove all other projects references from solution, and try it again.
good luck
almir