访问 Microsoft.Extensions.Hosting 服务时出现问题。使用 AddPooledDbContextFactory

Posted 2023-02-16

【中文标题】访问 Microsoft.Extensions.Hosting 服务时出现问题。使用 AddPooledDbContextFactory

【英文标题】：A issue occurred while accessing the Microsoft.Extensions.Hosting services. Using AddPooledDbContextFactory

【发布时间】：2021-07-02 14:47:04

【问题描述】：

您好，我在迁移时遇到问题，并且显示访问 Microsoft.Extensions.Hosting 服务时出现错误。在没有应用程序服务提供商的情况下继续。错误：某些服务无法构建（E 验证服务描述符“ServiceType：Microsoft.AspNetCore.Identity.IUserClaimsPrincipalFactory1[GraphQlApiFullStack.Models.AppUser] Lifetime: Scoped Implementati onType: Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory1[GraphQlApiFullStack.Models.AppUser]”时出错：无法解析类型“GraphQlApiFullStack.Data.ApplicationDbConte”的服务 xt 尝试激活 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserOnlyStore

谁能帮帮我，谢谢。

ApplicationDbContext.cs

using GraphQlApiFullStack.Models;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore;

namespace GraphQlApiFullStack.Data

    public class ApplicationDbContext : IdentityDbContext<AppUser>
    
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options)
        
            
        

        public DbSet<AppUser> AppUsers  get; set; 

        public DbSet<Employee> Employees  get; set; 

        public DbSet<Department> Departments  get; set; 
        
    

Startup.cs 服务

  public void ConfigureServices(IServiceCollection services)
        

            services.AddControllers();
            services.AddSwaggerGen(c =>
            
                c.SwaggerDoc("v1", new OpenApiInfo  Title = "GraphQlApiFullStack", Version = "v1" );
            );

            // We use a pooled Db Context Factory here to avoid issues with graphql concurrency
            
            services.AddPooledDbContextFactory<ApplicationDbContext>(builder =>
            
                builder.UseSqlServer(_configuration.GetConnectionString("defaultConnection"));
            );

            services.AddIdentityServices(_configuration);

        
    ```

【参考方案1】：

好的，我发现问题出在我的身份服务扩展方法上。