Entity Framework Core
Your target project [ProjectName] doesn't match your migrations assembly [AssemblyName]. Either change your target project or change your migrations assembly.
I am working on a project in ASP.NET Core 5.0, which contains a web application and the related class libraries. I use Entity Framework Core for data access. My DbContext is in a class library project. When I run the add-migration command I get this error.
Tags: Troubleshooting
HTTP Error 502.5 - ANCM Out-Of-Process Startup Failure
I got the following error when I deployed my ASP.NET Core Razor page application to the production server after updating some NuGet packages to the latest version. HTTP Error 502.5 - ANCM Out-Of-Process Startup Failure
Tags: Troubleshooting
Unable to create an object of type '[DBContextName]'. For the different patterns supported at design time see https://go.microsoft.com/fwlink/?linkid=851728
You may get the following error when you run the add-migration command in EF Core 5. Unable to create an object of type '[DBContextName]'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728
Tags: Troubleshooting
EF Core Migration Error: The query contains a projection '<>h_ Transparent Identifier 0 Collections in the final projection must be an 'IEnumerable<T>' type such as 'List<T>'.
The query contains a projection '<>h__TransparentIdentifier0 Collections in the final projection must be an 'IEnumerable' type such as 'List'. Consider using 'ToList' or some other mechanism to convert the 'IQueryable' or 'IOrderedEnumerable' into an 'IEnumerable'.
Tags: Troubleshooting
The entity type 'X' requires a primary key to be defined. If you intended to use a keyless entity type, call 'HasNoKey' in 'OnModelCreating'
I got the following error when I ran the add-migration command for the following entity. The entity type 'Student' requires a primary key to be defined. If you intended to use a keyless entity type,call 'HasNoKey' in 'OnModelCreating'. For more information on keyless entity types, see https://go.microsoft.com/fwlink/?linkid=2141943.
Tags: Troubleshooting