无法创建类型的对象＆＃x27; appContext＆＃x27;。使用冗长，但是
我试图进行第一次迁移，并遇到了这个错误。
我使用了：
dotnet ef migrations add initial --project AppProject.Core --verbose
错误：
Finding application service provider in assembly 'AppProject.Core'...
Finding Microsoft.Extensions.Hosting service provider...
-> No static method 'CreateHostBuilder(string[])' was found on class 'Program'.
-> No application service provider was found.
Finding DbContext classes in the project...
Found DbContext 'AppContext'.
Microsoft.EntityFrameworkCore.Design.OperationException: Unable to create an object of type 'AppContext'.
我的program.cs
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
}
我的创业公司
services.AddDbContext<AppContext>(options =>
{
options.UseNpgsql(connection);
});
services.AddIdentity<User, IdentityRole<Guid>>()
.AddEntityFrameworkStores<SysFishingContext>()
.AddDefaultTokenProviders();
我没有得到什么问题。请有人帮我。
I tried to do my first migration and I got this error.
I used:
dotnet ef migrations add initial --project AppProject.Core --verbose
The error:
Finding application service provider in assembly 'AppProject.Core'...
Finding Microsoft.Extensions.Hosting service provider...
-> No static method 'CreateHostBuilder(string[])' was found on class 'Program'.
-> No application service provider was found.
Finding DbContext classes in the project...
Found DbContext 'AppContext'.
Microsoft.EntityFrameworkCore.Design.OperationException: Unable to create an object of type 'AppContext'.
My Program.cs
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup<Startup>();
});
}
My Startup
services.AddDbContext<AppContext>(options =>
{
options.UseNpgsql(connection);
});
services.AddIdentity<User, IdentityRole<Guid>>()
.AddEntityFrameworkStores<SysFishingContext>()
.AddDefaultTokenProviders();
I don't get what is the problem. Please someone help me.
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尝试指定这两个选项
- 项目和- startup-project-p | -project＆lt; project＆gt;这是该项目
dbContext坐在。-s | - startup-project＆lt; project＆gt;这是带有依赖性注入设置的项目，通常是Web项目。
您的
迁移添加命令可能看起来如下：Try to specify both options
--projectand--startup-project-p|--project <PROJECT>This is the project that
DbContextis sitting in.-s|--startup-project <PROJECT>This is the project with Depenedency Injection setup, usually the Web project.
Your
migrations addcommand might look like below: