最简单的方法是创建一个自定义的视图模型，其中包含用户本身和角色他是成员。实现可能如下所示：

The easiest way would be to create a custom ViewModel which contains the user itself and the roles he is member of. An implementation could look like the following:

控制器

public async Task<ViewResult> Users()
{
    var users = UserManager.Users;
    var model = new Collection<UserRoleViewModel>();

    foreach (var user in users)
    {
        var roles = await UserManager.GetRolesAsync(user.Id);
        var rolesCollection = new Collection<IdentityRole>();

        foreach (var role in roles)
        {
            var role = await RoleManager.FindByNameAsync(roleName);
            rolesCollection.Add(role);
        }

        model.Add(new UserRoleViewModel { User = user, Roles = rolesCollection });
    }

    return View("Users", model);
}

UserRoleViewModel

public class UserRoleViewModel
{
    public ApplicationUser User { get; set; }

    public Collection<IdentityRole> Roles { get; set; }
}

使用，你可以用下面的模型在视图中遍历相应的属性。

With that you can use the following model in your view to iterate over the appropriate properties

@model ICollection<YourProject.Models.UserRoleViewModel>