无法获取UserManager类 [英] Cannot get the UserManager class

问题描述

我想做的是添加一个新的管理员用户，并为其分配管理员角色. 所以..我进入了Configure方法中的Startup.cs类，并编写了以下代码:

What I'm trying to do is to add a new admin user and assign it with the admin role. So.. I went to the Startup.cs class in Configure method and wrote the following code:

var context = app.ApplicationServices.GetService<ApplicationDbContext>();

// Getting required parameters in order to get the user manager
var userStore = new UserStore<ApplicationUser>(context);

// Finally! get the user manager!
var userManager = new UserManager<ApplicationUser>(userStore);

但是，我收到以下错误消息:

However, I get the following error message:

严重性代码描述项目文件行抑制状态 错误CS7036没有给出与 必需的形式参数'optionsAccessor' UserManager.UserManager(IUserStore， IOptions，IPasswordHasher， IEnumerable>， IEnumerable>，ILookupNormalizer， IdentityErrorDescriber，IServiceProvider， ILogger>)'FinalProject..NETCoreApp，Version = v1.0 C:\ Users \ Or Natan \ Documents \ Visual Studio 2015 \ Projects \ FinalProject \ src \ FinalProject \ Startup.cs 101有效

Severity Code Description Project File Line Suppression State Error CS7036 There is no argument given that corresponds to the required formal parameter 'optionsAccessor' of UserManager.UserManager(IUserStore, IOptions, IPasswordHasher, IEnumerable>, IEnumerable>, ILookupNormalizer, IdentityErrorDescriber, IServiceProvider, ILogger>)' FinalProject..NETCoreApp,Version=v1.0 C:\Users\Or Natan\Documents\Visual Studio 2015\Projects\FinalProject\src\FinalProject\Startup.cs 101 Active

此错误在这里使我丧命..显然，我需要userManager来创建新用户，但我无法初始化该东西.

This error is killing me here.. obviously I need the userManager in order to create the new user but I just can't initialize this thing.

推荐答案

您可以使用

You can use dependency injection to obtain an instance of UserManager. Just add a parameter to the configure method, like this:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, ApplicationDbContext context, UserManager<ApplicationUser> userManager, RoleManager<IdentityRole> roleManager)

然后，您可以创建用户和角色.我通常将此代码移到静态类中.

Then you can create users and roles. I usually move this code into a static class...

public static class DbInitializer
{
    public static async Task Initialize(ApplicationDbContext context, UserManager<ApplicationUser> userManager, RoleManager<IdentityRole> roleManager)
    {
        // Ensure that the database exists and all pending migrations are applied.
        context.Database.Migrate();

        // Create roles
        string[] roles = new string[] { "UserManager", "StaffManager" };
        foreach (string role in roles)
        {
            if (!await roleManager.RoleExistsAsync(role))
            {
                await roleManager.CreateAsync(new IdentityRole(role));
            }
        }

        // Create admin user
        if (!context.Users.Any())
        {
            await userManager.CreateAsync(new ApplicationUser() { UserName = "[e-mail]", Email = "[e-mail]" }, "p@ssw0rd");
        }

        // Ensure admin privileges
        ApplicationUser admin = await userManager.FindByEmailAsync("[e-mail]");
        foreach (string role in roles)
        {
            await userManager.AddToRoleAsync(admin, role);
        }
    }
}

...并在Startup.Configure方法中调用该方法:

... and call the method in the Startup.Configure method:

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory, ApplicationDbContext context, UserManager<ApplicationUser> userManager, RoleManager<IdentityRole> roleManager)
{
    // Code omitted for brevity

    // Create seed data
    DbInitializer.Initialize(context, userManager, roleManager).Wait();
}

在Entity Framework Core的下一版本中，数据库种子将是添加为功能.

In one of the next releases of Entity Framework Core database seeding will be added as a feature.

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