Question

仅当我从Startup.cs中的Configure调用扩展方法SeedDatabase时，才收到此错误。如果我对那条线发表评论，一切都会很好。

这是Startup.cs中的Configure方法：

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

        app.UseStatusCodePagesWithReExecute("/Home/Error", "?statusCode={0}");

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

        app.UseAuthentication();

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

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

        app.SeedDatabase(); // if comment this works!
    }

有一个带有SeedDatabase方法的IApplicationBuilder扩展类。

 public static class ApplicationBuilderExtensions
{
    private const string DefaultAdminEmail = "admin@gmail.com";
    private const string DefaultAdminPassword = "admin";
    private const string DefaultUserEmail = "user@gmail.com";
    private const string DefaultUserPassword = "user";

    private static readonly IdentityRole[] defaultRoles = new IdentityRole[]
    {
        new IdentityRole(RoleName.Admin),
        new IdentityRole(RoleName.Member),
    };

    public static async void SeedDatabase(this IApplicationBuilder app)
    {
        using (var serviceScope = app.ApplicationServices.GetService<IServiceScopeFactory>().CreateScope())
        {
            var userManager = serviceScope.ServiceProvider.GetRequiredService<UserManager<User>>();
            var roleManager = serviceScope.ServiceProvider.GetRequiredService<RoleManager<IdentityRole>>();

            await SeedRoles(roleManager);

            await SeedUsers(userManager, roleManager);
        }
    }

    private static async Task SeedRoles(RoleManager<IdentityRole> roleManager)
    {
        foreach (var role in defaultRoles)
        {
            var roleExist = await roleManager.RoleExistsAsync(role.Name);
            if (!roleExist)
            {
                await roleManager.CreateAsync(role);
            }
        }
    }

    private static async Task SeedUsers(UserManager<User> userManager, RoleManager<IdentityRole> roleManager)
    {
        var adminUser = await userManager.FindByEmailAsync(DefaultAdminEmail);
        var memberUser = await userManager.FindByEmailAsync(DefaultUserEmail);

        if (adminUser == null)
        {
            adminUser = new User()
            {
                UserName = DefaultAdminEmail,
                Email = DefaultAdminEmail
            };

            await userManager.CreateAsync(adminUser, DefaultAdminPassword);
        }

        if (memberUser == null)
        {
            memberUser = new User()
            {
                UserName = DefaultUserEmail,
                Email = DefaultUserEmail
            };

            await userManager.CreateAsync(memberUser, DefaultUserPassword);
        }

        await userManager.AddToRoleAsync(adminUser, RoleName.Admin);
        await userManager.AddToRoleAsync(memberUser, RoleName.Member);
    }
}

Answer 1

确保在防火墙上打开了端口44311，看来它无法访问数据库

还必须调试并检查错误

这是查看您如何调试的链接 https://docs.microsoft.com/en-us/aspnet/core/migration/index?view=aspnetcore-2.1

HTTP错误502.3-播种数据库时网关错误

1 个答案: