当你遇到“Unable to create a 'DbContext' of type ''. The exception 'Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions1[YourDbContext]' while attempting to activate 'YourDbContext'.”这个错误时,通常表示在尝试创建DbContext实例时,依赖注入容器无法解析DbContextOptions<...
Unable to create a 'DbContext' of type ''. The exception 'Method not found: 'Void CoreTypeMappingParameters..ctor(System.Type, Microsoft.EntityFrameworkCore.Storage.ValueConversion.ValueConverter, Microsoft.EntityFrameworkCore.ChangeTracking.ValueComparer, Microsoft.EntityFrameworkCore.ChangeTracking.ValueC...
Unable to create a 'DbContext' of type ''. The exception 'Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContextOptions`1[mywebsite.Data.ApplicationDbContext]' while attempting to activate 'mywebsite.Data.ApplicationDbContext'.' was thrown while attempting to create an insta...
很明显这个做法是有问题的,都是DI的年代了,你的DbContext又不是动态生产了一堆出来,完全没必要。 然后仔细检查,发现在注入的地方,没有注入Option(调试的时候注释了), 于是正常注入,Okay!
Unable to create a 'DbContext' of type 'BloggingContext'. The exception 'Method 'get_LockReleaseBehavior' in type 'Oracle.EntityFrameworkCore.Migrations.Internal.OracleHistoryRepos itory' from assembly 'Oracle.EntityFrameworkCore, Version=8.0.23.1, Culture=neutral, PublicKeyToken=89b483f429c47342'...
使用efcoe迁移时指令Add-Migration InitialCreate报错了: Unable to create an object of type 'ServerDataContext'. For the different patterns supported at design time, seehttps://go.microsoft.com/fwlink/?linkid=851728 网上搜了很久解决方案 1.在 Startup 类中配置 DbContext,然后通过构造函数注入到您的控...
编译错误还是运行时错误？我试了一下这几句代码，不会出现错误。编译不会，运行也不会。
ApplicationContext.cs复制 using Enti; using Microsoft.EntityFrameworkCore; using System; using System.Collections.Generic; using System.Text; namespace Data.DbAccess { public class ApplicationContext : DbContext { public ApplicationContext(DbContextOptions<ApplicationContext> options) : base(options) { ...
Unable to create an object of type 'ApplicationDbContext'. 2018-04-09 15:14 −https://stackoverflow.com/questions/45892312/how-to-add-an-implementation-of-idesigntimedbcontextfactorydatacontext-to-th 搞不明白2.0里这个报错,讨厌的Migration! 如... ...
https://stackoverflow.com/questions/45892312/how-to-add-an-implementation-of-idesigntimedbcontextfactorydatacontext-to-th 搞不明白2.0里这个报错,讨厌的Migration! 如果用了初始化数据。。。要分开run。好像是这么回事。。顺序乱了 var host = BuildWebHost(args); ...