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Unable to create an object of type 'DataContext'. For the different patterns supported at design time

Unable to create an object of type 'DataContext'. For the different patterns supported at design time


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An error occurred while accessing the Microsoft.Extensions.Hosting services. Continuing without the application service provider. Error: Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.ISecurityStampValidator Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.SecurityStampValidator`1[Repository.ApplicationUser]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9[Repository.ApplicationUser,Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserClaim`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserLogin`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserToken`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.) (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.ITwoFactorSecurityStampValidator Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.TwoFactorSecurityStampValidator`1[Repository.ApplicationUser]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9[Repository.ApplicationUser,Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserClaim`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserLogin`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserToken`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.) (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.IUserClaimsPrincipalFactory`1[Repository.ApplicationUser] Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`2[Repository.ApplicationUser,Repository.Role]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9[Repository.ApplicationUser,Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserClaim`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserLogin`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserToken`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.) (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.UserManager`1[Repository.ApplicationUser] Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.UserManager`1[Repository.ApplicationUser]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9[Repository.ApplicationUser,Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserClaim`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserLogin`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserToken`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.) (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.SignInManager`1[Repository.ApplicationUser] Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.SignInManager`1[Repository.ApplicationUser]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9[Repository.ApplicationUser,Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserClaim`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserLogin`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserToken`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.) (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.RoleManager`1[Repository.Role] Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.RoleManager`1[Repository.Role]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.RoleStore`5[Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.) (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.IUserStore`1[Repository.ApplicationUser] Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9[Repository.ApplicationUser,Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserClaim`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserLogin`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserToken`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.UserStore`9[Repository.ApplicationUser,Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserClaim`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserLogin`1[System.String],Microsoft.AspNetCore.Identity.IdentityUserToken`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.) (Error while validating the service descriptor 'ServiceType: Microsoft.AspNetCore.Identity.IRoleStore`1[Repository.Role] Lifetime: Scoped ImplementationType: Microsoft.AspNetCore.Identity.EntityFrameworkCore.RoleStore`5[Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]': Unable to resolve service for type 'HH.Repository.DataContext' while attempting to activate 'Microsoft.AspNetCore.Identity.EntityFrameworkCore.RoleStore`5[Repository.Role,HH.Repository.DataContext,System.String,Microsoft.AspNetCore.Identity.IdentityUserRole`1[System.String],Microsoft.AspNetCore.Identity.IdentityRoleClaim`1[System.String]]'.)

Unable to create an object of type 'DataContext'. For the different patterns supported at design time, see https://go.microsoft.com/fwlink/?linkid=851728


Answers

Options 1.

Please check your  connection string first in appsetting,json like as 

{

  "ConnectionStrings": {
    "DefaultConnection": "Data Source=your-server-name;Database=database-name; uid=sql-user-name;pwd=your-password;",
  },
    "Logging": {
    "IncludeScopes": false,
    "Debug": {
      "LogLevel": {
        "Default": "Warning"
      }
    },
    "Console": {
      "LogLevel": {
        "Default": "Warning"
      }
    }
  },
  "AllowedHosts": "*",
}

After then try to adding a plain constructor to your Context as given below

public class DataContext : DbContext
{
public DataContext()
    {
    }
    public DataContext(DbContextOptions options) : base(options)
    {
    }
    protected override void OnConfiguring(DbContextOptionsBuilder options)
    {
        if (!options.IsConfigured)
        {
           options.UseSqlServer("A FALLBACK CONNECTION STRING");
        }
    }
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
    }
}

Options 2.

Please check your Solution for someone who have multiple projects

Some time I have solved  same as issue and solved it by selecting one project as startup project instead of multiple projects.

Options 3.

public void ConfigureServices(IServiceCollection services) 

{

            var databaseConnectionString = Configuration.GetConnectionString("AppDatabase");
            services.AddDbContext<ApplicationDbContext>(options =>
                options.UseMySql(databaseConnectionString));
            services.AddIdentity<IdentityUser, IdentityRole>()
                .AddEntityFrameworkStores<IdentityDbContext>();
}

Resolveļ¼š

.AddEntityFrameworkStores<IdentityDbContext>();

change to

.AddEntityFrameworkStores<ApplicationDbContext>();

Options 4.

Or you can solved you problem by this link.Some links are give below

  1. https://entityframeworkcore.com/knowledge-base/60930837/asp-net-core-plus-entity-framework-core-plus-sqlite-creating-initial-migration-throws-error
  2. https://github.com/dotnet-architecture/eShopOnContainers/issues/1080
  3. https://forums.asp.net/t/2153826.aspx?Entityframework+codefirst+migration+error+in+web+api
  4. https://stackoverflow.com/questions/45892312/how-to-add-an-implementation-of-idesigntimedbcontextfactorydatacontext-to-th


Mahira  khanna

Mahira khanna

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