asp.net-mvc – 我的MVC 5模板中没有ApplicationRoleManager类

当我尝试将app.CreatePerOwinContext(ApplicationRoleManager.Create)添加到configauth时,我被告知applicationRoleManager不存在.有人知道为什么吗？

using Microsoft.Owin.Security.OAuth;
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.EntityFramework;
using Microsoft.AspNet.Identity.Owin;
using Microsoft.Owin;
using Microsoft.Owin.Security.Cookies;
using Microsoft.Owin.Security.DataProtection;
using Microsoft.Owin.Security.Google;
using Owin;
using System;
using LaCeibaNetv4.Models;

namespace LaCeibaNetv4
{
    public partial class Startup
    {
        // For more information on configuring authentication,please visit http://go.microsoft.com/fwlink/?LinkId=301864
        public void ConfigureAuth(IAppBuilder app)
        {
            // Configure the db context and user manager to use a single instance per request
            app.CreatePerOwinContext(ApplicationDbContext.Create);
            app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);

解决方法

public class ApplicationRoleManager : RoleManager<IdentityRole>
{
    public ApplicationRoleManager(IRoleStore<IdentityRole,string> roleStore)
    : base(roleStore) { }

    public static ApplicationRoleManager Create(
        IdentityFactoryOptions<ApplicationRoleManager> options,IOwinContext context)
    {
        var manager = new ApplicationRoleManager(
            new RoleStore<IdentityRole>(context.Get<ApplicationDbContext>()));
        return manager;
    }
}

另外,记得在启动时通过在Startup.Auth.cs中添加这段代码来配置它：

app.CreatePerOwinContext<ApplicationRoleManager>(ApplicationRoleManager.Create);

完整的文章可在此处获取：http://www.codeproject.com/Articles/762428/ASP-NET-MVC-and-Identity-Understanding-the-Basics

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