asp.net Kern- und EF-Core-Fehler, während Migration hinzufügen

Question

In einer asp.net Core App, ich versuche, für EF-Code Faust zu migrieren.

ich unten Fehler bekam,

An error occurred while calling method 'ConfigureServices' on startup class 'WebAppHandOn.Startup'. Consider using IDbContextFactory to override the initialization of the DbContext at design-time. Error: Could not load file or assembly 'Microsoft.AspNetCore.Routing, Version=1.0.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)

No parameterless constructor was found on 'ApplicationDbContext'. Either add a parameterless constructor to 'ApplicationDbContext' or add an implementation of 'IDbContextFactory' in the same assembly as 'ApplicationDbContext'.

Hier werden die verschiedenen Code-Dateien sind,

1. Startup Klasse

   public void ConfigureServices(IServiceCollection services) 
   { 
       // Add framework services. 
       services.AddMvc(); 
   
       // Add EntityFramework's Identity support. 
       services.AddEntityFramework(); 
   
       // Add ApplicationDbContext. 
       services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(Configuration["Data:DefaultConnection:ConnectionString"])); 
   } 
   

2. ApplicationDBContext Klasse

   public class ApplicationDbContext : DbContext { 
       #region Constructor 
   
       public ApplicationDbContext(DbContextOptions options) : base(options) 
       { 
       } 
       #endregion Constructor 
   
       #region Methods 
       protected override void OnModelCreating(ModelBuilder modelBuilder) 
       { 
        base.OnModelCreating(modelBuilder); 
       } 
       #endregion Methods 
   
       #region Properties 
       public DbSet<Item> Items { get; set; } 
       public DbSet<Comment> Comments { get; set; } 
       public DbSet<ApplicationUser> Users { get; set; } 
       #endregion Properties 
   } 
   

3. Project.json Klasse

{ 
 
     "dependencies": { 
 
    "Microsoft.AspNetCore.Mvc": "1.0.0", 
 
    "Microsoft.AspNetCore.Server.IISIntegration": "1.0.0", 
 
    "Microsoft.AspNetCore.Server.Kestrel": "1.0.0", 
 
    "Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0", 
 
    "Microsoft.Extensions.Configuration.FileExtensions": "1.0.0", 
 
    "Microsoft.Extensions.Configuration.Json": "1.0.0", 
 
    "Microsoft.Extensions.Logging": "1.0.0", 
 
    "Microsoft.Extensions.Logging.Console": "1.0.0", 
 
    "Microsoft.Extensions.Logging.Debug": "1.0.0", 
 
    "Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0", 
 
    "Microsoft.AspNetCore.Diagnostics": "1.0.0", 
 
    "Microsoft.AspNetCore.Routing": "1.0.0", 
 
    "Microsoft.AspNetCore.Authentication.JwtBearer": "1.0.0", 
 
    "Microsoft.AspNetCore.StaticFiles": "1.0.0", 
 
    "Microsoft.VisualStudio.Web.BrowserLink.Loader": "14.0.0", 
 
    "Newtonsoft.Json": "9.0.1", 
 
    "Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore": "1.0.0", 
 
    "Microsoft.AspNetCore.Identity.EntityFrameworkCore": "1.0.0", 
 
    "Microsoft.EntityFrameworkCore": "1.0.0", 
 
    "Microsoft.EntityFrameworkCore.SqlServer": "1.0.0", 
 
    "Microsoft.EntityFrameworkCore.Design": "1.0.0-preview2-final", 
 
    "TinyMapper": "2.0.8" 
 
    }, 
 

 
    "tools": { 
 
    "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final", 
 
    "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final" 
 
    },

Answer 1

prüfen yourproject.csproj Datei, entfernen Sie alle Preview-Version in jedem PackageReference Tag und installieren stabile Version mit NuGet Pakete verwalten. Hoffe, dass hilft