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>();

}

Resolve：

.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