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Fix: dotnet ef migrations add fails with 'Unable to create an object of type DbContext'

startdebugging.net · published 11 May 2026

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Fix: System.InvalidOperationException: No connection string named 'DefaultConnection' could be found Read at the source ↗
startdebugging.net
Fix: Cannot consume scoped service 'X' from singleton 'Y' Read at the source ↗
startdebugging.net
Fix: A second operation was started on this context instance before a previous operation completed Read at the source ↗
startdebugging.net
EF Core 11 Lets You Create and Apply a Migration in One Command Read at the source ↗
startdebugging.net
How to write integration tests against a real SQL Server with Testcontainers Read at the source ↗
startdebugging.net
How to warm up EF Core's model before the first query Read at the source ↗
startdebugging.net
https://learn.microsoft.com/en-us/ef/core/cli/dbcontext-creation
learn.microsoft.com
https://learn.microsoft.com/en-us/ef/core/cli/dotnet
learn.microsoft.com
https://github.com/dotnet/runtime/blob/main/src/libraries/Microsoft.Extensions.Hosting/src/Internal/HostFactoryResolver.cs
github.com
https://github.com/dotnet/efcore/issues/21025
github.com
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/minimal-apis
learn.microsoft.com