我将我的 .NET CORE 项目从 2.1 更新到 3.1,但我在 Startup 类中有一些错误 [英] I updated my .NET CORE project from 2.1 to 3.1, yet I have some errors in the class Startup

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问题描述

我刚刚更新了我的 .NET CORE 版本.我已经更新了所有的使用,但是在添加默认标识时,我仍然在 satrtup 类中的 ConfigureServices 方法中出现错误.它只是给我一个错误,说‘IServiceCollection’不包含‘AddDefaultIdentity’的定义,也没有可访问的扩展方法‘AddDefaultIdentity...’".方法如下:

I just updated my version of .NET CORE. I already updated all the usings however I still have an error in the satrtup class, in the method ConfigureServices, when adding the default identity. It just gives me an error saying "'IServiceCollection' does not contain a definition for 'AddDefaultIdentity and no accessible extension method 'AddDefaultIdentity...'". Here is the method:

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<CookiePolicyOptions>(options =>
    {
        // This lambda determines whether user consent for non-essential cookies is needed for a given request.
        options.CheckConsentNeeded = context => true;
        options.MinimumSameSitePolicy = SameSiteMode.None;
    });

    services.AddDbContext<ApplicationDbContext>(options =>
       options.UseSqlServer(     
           Configuration.GetConnectionString("DefaultConnection")));

    //ERROR
    services.AddDefaultIdentity<IdentityUser>()
        .AddEntityFrameworkStores<ApplicationDbContext>();

    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_3_0);

    //SIGNAL R
    services.AddSignalR();
}

我在 Configure 方法中也有错误.

I also have an error in the Configure method.

  public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
            //ERROR
            app.UseDatabaseErrorPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }
       //MORE CODE
  }

我应该怎么做才能解决这个错误?

What should I do to solve this error?

推荐答案

这两个扩展方法已移入单独的 NuGet 包中,必须在 ASP.NET Core 3.0 及更高版本中显式引用:

Those two extension methods have moved into separate NuGet packages, which must be referenced explicitly in ASP.NET Core 3.0 and upwards:

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