我正在尝试向我的项目添加一些角色和用户。我正在使用ASP.NET Core 3.1版。现在,我在Startup类中尝试了此操作:
private async Task CreateRoles(IServiceProvider serviceProvider)
{
//initializing custom roles
var RoleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();
var UserManager = serviceProvider.GetRequiredService<UserManager<ApplicationUser>>();
string[] roleNames = { "Admin", "Operacional"};
IdentityResult roleResult;
foreach (var roleName in roleNames)
{
var roleExist = await RoleManager.RoleExistsAsync(roleName);
// ensure that the role does not exist
if (!roleExist)
{
//create the roles and seed them to the database:
roleResult = await RoleManager.CreateAsync(new IdentityRole(roleName));
}
}
// find the user with the admin email
var _user = await UserManager.FindByEmailAsync("admin@gmail.com");
// check if the user exists
if (_user == null)
{
//Here you could create the super admin who will maintain the web app
var poweruser = new ApplicationUser
{
UserName = "Admin",
Email = "admin@gmail.com",
};
string adminPassword = "Abc*123";
var createPowerUser = await UserManager.CreateAsync(poweruser, adminPassword);
if (createPowerUser.Succeeded)
{
//here we tie the new user to the role
await UserManager.AddToRoleAsync(poweruser, "Admin");
}
}
}
和
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IServiceProvider serviceProvider)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
app.UseDatabaseErrorPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseCookiePolicy();
app.UseAuthentication();
//SIGNAL R
//String caminho = configuration["AppSettings:Servidor"] + "/myHub";
String caminho = Configuration["AppSettings:Servidor"] + "/myHub";
//endpoints.MapHub<MyHub>(caminho);
//app.UseSignalR(route =>
//{
// route.MapHub<MyHub>(caminho);
//});
app.UseRouting();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapHub<MyHub>("/myHub");
endpoints.MapControllerRoute(
name: "default",
pattern: "{controller=Home}/{action=Index}/{id?}");
endpoints.MapRazorPages();
});
CreateRoles(serviceProvider).Wait();
}
当我运行项目时,它给我错误“ System.AggregateException:'类型为'Microsoft.AspNetCore.Identity.UserManager`1 [ProjectName.ApplicationUser]'的服务已被注册。当容器被销毁时可注册)'。 “在CreateRoles(serviceProvider).Wait();中; 为什么会这样?
答案 0 :(得分:1)
尝试在您的services.AddDefaultIdentity<ApplicationUser>();
中添加Startup.cs
。
有关更多信息,请查看官方docs。