ASP.NET Core身份:角色管理器无服务 [英] ASP.NET Core Identity: No service for role manager
问题描述
我有一个使用Identity的ASP.NET Core应用程序.它可以工作，但是当我尝试向数据库中添加自定义角色时，我遇到了问题.
I have an ASP.NET Core app that uses Identity. It works, but when I am trying to add custom roles to the database I run into problems.
在启动ConfigureServices中，我已将Identity和角色管理器添加为如下范围服务:
In Startup ConfigureServices I have added Identity and the role manager as a scoped service like this:
services.AddIdentity<Entities.DB.User, IdentityRole<int>>()
.AddEntityFrameworkStores<MyDBContext, int>();
services.AddScoped<RoleManager<IdentityRole>>();
和在启动Configure中，我注入RoleManager并将其传递给我的自定义类RolesData:
and in Startup Configure I inject RoleManager and pass it to my custom class RolesData:
public void Configure(
IApplicationBuilder app,
IHostingEnvironment env,
ILoggerFactory loggerFactory,
RoleManager<IdentityRole> roleManager
)
{
app.UseIdentity();
RolesData.SeedRoles(roleManager).Wait();
app.UseMvc();
这是RolesData类:
public static class RolesData
{
private static readonly string[] roles = new[] {
"role1",
"role2",
"role3"
};
public static async Task SeedRoles(RoleManager<IdentityRole> roleManager)
{
foreach (var role in roles)
{
if (!await roleManager.RoleExistsAsync(role))
{
var create = await roleManager.CreateAsync(new IdentityRole(role));
if (!create.Succeeded)
{
throw new Exception("Failed to create role");
}
}
}
}
}
该应用程序的构建没有错误，但是当尝试访问它时，出现以下错误:
The app builds without errors, but when trying to access it I get the following error:
无法解析类型为' Microsoft.AspNetCore.Identity.IRoleStore`1 [Microsoft.AspNetCore.Identity.EntityFrameworkCore.IdentityRole]的服务.尝试激活' Microsoft.AspNetCore.Identity.RoleManager
Unable to resolve service for type 'Microsoft.AspNetCore.Identity.IRoleStore`1[Microsoft.AspNetCore.Identity.EntityFrameworkCore.IdentityRole]' while attempting to activate 'Microsoft.AspNetCore.Identity.RoleManager
我做错了什么?我的直觉说，我如何将RoleManager添加为服务有问题.
What am I doing wrong? My gut says there's something wrong with how I add the RoleManager as a service.
PS:创建项目以从头开始学习Identity时，我使用了无身份验证".
PS: I have used "No authentication" when creating the project to learn Identity from scratch.
推荐答案
我做错了什么?我的直觉说我将RoleManager添加为服务有问题.
What am I doing wrong? My gut says there's something wrong with how I add the RoleManager as a service.
注册部分实际上很好，您应该删除services.AddScoped<RoleManager<IdentityRole>>()，因为services.AddIdentity()已经为您添加了角色管理器.
The registration part is actually fine, tho' you should remove services.AddScoped<RoleManager<IdentityRole>>(), as the role manager is already added for you by services.AddIdentity().
您的问题很可能是由通用类型不匹配引起的:使用IdentityRole<int>调用services.AddIdentity()时，尝试使用IdentityRole解决RoleManager，这等效于IdentityRole<string>(string是ASP.NET Core Identity中的默认密钥类型).
Your issue is most likely caused by a generic type mismatch: while you call services.AddIdentity() with IdentityRole<int>, you try to resolve RoleManager with IdentityRole, which is an equivalent of IdentityRole<string> (string being the default key type in ASP.NET Core Identity).
更新您的Configure方法以使用RoleManager<IdentityRole<int>>参数，它应该可以工作.
Update your Configure method to take a RoleManager<IdentityRole<int>> parameter and it should work.
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