entity-framework-migrations

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 months ago . Improve this question I'm following one of Mosh Hamedani Course on ASP.NET MVC in Udemy. I came across one error while designing my Database using code-first (Entity Framework). At first, I got the error of " No DbContext was found in assembly" . After resolving this problem

问题 I currently have an efcore 2.1 project with about 230 entities and about 350 migrations. Every time i add an efcore migration, a designer file is created. This file is approximately 535 kb and growing (150mb total for alle designer files). This makes the IDE slow and unresponsive, refactoring is a no go, it also makes the build process slower. If i delete all designer files, the build goes down from 110 to 20 seconds, and the IDE gets snappy again. however, once I delete all designer files, i

问题 I currently have an efcore 2.1 project with about 230 entities and about 350 migrations. Every time i add an efcore migration, a designer file is created. This file is approximately 535 kb and growing (150mb total for alle designer files). This makes the IDE slow and unresponsive, refactoring is a no go, it also makes the build process slower. If i delete all designer files, the build goes down from 110 to 20 seconds, and the IDE gets snappy again. however, once I delete all designer files, i

问题 In previous version of entity framework, one could recreate the database if the model changes, using some of the classes DropDatabseIfModelChanges and other related classes. In EF7 or EF Core i don't know how to do that. Run the migrations some times give problems and in the beginning of the project i need to change the models constantly. 回答1: There's currently no easy way to implement DropDatabseIfModelChanges in EFCore. EF6 worked by storing a snapshot of your model in the _

问题 I created a new project with the XAF Blazor 20.2.3 wizard and upgraded the EFCore packages to 5.0. In PM I ran Install-Package Microsoft.EntityFrameworkCore.Tools However when I run add-migration initial I get Unable to create an object of type 'ExamBuddyEFCoreDbContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728 I have looked at the link but I don't think it applies to the xaf Blazor app. I tried commenting out the Database

问题 I'm trying to build an aspnetcore application over an existing system where the database is already created, and I'm going to add some tables over it. I've reverse engineered the database to add the existing tables as entities to my application, and I've written my own entities that will be added later. Finally, all the entities are added to a single DbContext. My requirement comes as follows: I want to enable code first migrations for the newly added entities I don't want the migrations to

问题 I'm trying to build an aspnetcore application over an existing system where the database is already created, and I'm going to add some tables over it. I've reverse engineered the database to add the existing tables as entities to my application, and I've written my own entities that will be added later. Finally, all the entities are added to a single DbContext. My requirement comes as follows: I want to enable code first migrations for the newly added entities I don't want the migrations to

问题 I'm trying to build an aspnetcore application over an existing system where the database is already created, and I'm going to add some tables over it. I've reverse engineered the database to add the existing tables as entities to my application, and I've written my own entities that will be added later. Finally, all the entities are added to a single DbContext. My requirement comes as follows: I want to enable code first migrations for the newly added entities I don't want the migrations to

来源： https://stackoverflow.com/questions/55210832/ef-core-one-to-many-relationship-list-returns-null

来源： https://stackoverflow.com/questions/55210832/ef-core-one-to-many-relationship-list-returns-null