c# – 找到多个名为’NewProject.Models.DbContext’的DbContext

IdentityStartup.cs中生成的代码

[assembly:HostingStartup(typeof(ShareAndCare.Areas.Identity.IdentityHostingStartup))]
namespace ShareAndCare.Areas.Identity
{
    public class IdentityHostingStartup : IHostingStartup
    {
        public void Configure(IWebHostBuilder builder)
        {
            builder.ConfigureServices((context,services) => {

                services.AddDbContext<ShareAndCareContext>(options =>
                   options.UseLazyLoadingProxies().UseSqlServer(
                       context.Configuration.GetConnectionString("ShareAndCareContextConnection")));

                services.AddIdentity<ShareAndCareUser,IdentityRole>()
                .AddEntityFrameworkStores<ShareAndCareContext>()
                .AddDefaultTokenProviders();

                services.AddSingleton<IEmailSender,EmailSender>();               

            });

        }
    }
}

在Startup.cs中生成的代码

namespace ShareAndCare
    {
        public class Startup
        {
            public Startup(IConfiguration configuration)
            {
                Configuration = configuration;
            }

            public IConfiguration Configuration { get; }

            // This method gets called by the runtime. Use this method to add services to the container.
            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.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);            
            }    
            // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
            public void Configure(IApplicationBuilder app,IHostingEnvironment env,IServiceProvider serviceProvider)
            {
                if (env.IsDevelopment())
                {
                    app.UseDeveloperExceptionPage();
                }
                else
                {
                    app.UseExceptionHandler("/Home/Error");
                    app.UseHsts();
                }

                app.UseHttpsRedirection();
                app.UseStaticFiles();
                app.UseAuthentication();
                app.UseCookiePolicy();

                app.UseMvc(routes =>
                {
                    routes.MapRoute(
                        name: "default",template: "{controller=Home}/{action=Index}/{id?}");
                });                
            }   
        }
    }

这个工作正常,直到我想用控制器和视图使用EF来构建模型.设置好所有内容并单击“确定”后,我收到一条错误消息：找到了多个名为“ShareAndCare.Models.ShareAndCareContext”的DbContext.通过使用其确切大小写提供其完全限定名称来指定要使用的名称.我检查了所有的文件夹和命名空间,但那里没有问题,只有一个具有该名称的上下文.那问题是什么？