C# asp.net中缺少FindByEmail

如何在ASP.net中启用方法“FindByEmail”？

我在asp.net中有以下代码

文件RoleActions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
...
using Microsoft.AspNet.Identity;
using Microsoft.AspNet.Identity.EntityFramework;

...
            IdentityResult IdRoleResult;
            IdentityResult IdUserResult;

            //Create a Role object by using the ApplicationDbContext object.
            // The RoleStore is only allowed to contain IdentityRole objects.
            var roleStore = new RoleStore<IdentityRole>(context);

            //Create a RoleManager object that is only allowed to contain IdentityRole objects.
            //When creating the RoleManager object, you pass in (as a parameter) a new RoleStore object.
            var roleMgr = new RoleManager<IdentityRole>(roleStore);

            //Then, you create the "canEdit" role if it doesn't already exist.
            if (!roleMgr.RoleExists("canEdit"))
            {
                IdRoleResult = roleMgr.Create(new IdentityRole { Name = "canEdit" });
            }

            // Create a UserManager object based on the UserStore object and the ApplicationDbContext object. Note that you can create new objects and use the as parameters in a single line of code, rather than using multiple lines of code, as you did for the RoleManager object.

            var userMgr = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(context));
            var appUser = new ApplicationUser
            {
                UserName = "canEditUser@example.com",
                Email = "canEditUser@example.com"
            };
            IdUserResult = userMgr.Create(appUser, "password1");

            // If the new "canEdit" user was successfully created, add the "canEdit" user to the "canEdit" role.
            if (!userMgr.IsInRole(userMgr.FindByEmail("canEditUser@example.com").Id, "canEdit"))
            {
                IdUserResult = userMgr.AddToRole(userMgr.FindByEmail("canEditUser@example.com").Id, "canEdit");
            }
        }
    }
}

// You can add User data for the user by adding more properties to your User class, please visit http://go.microsoft.com/fwlink/?LinkID=317594 to learn more.
public class ApplicationUser : IdentityUser
{       
}

我在生成时遇到错误：

“错误1'Microsoft.AspNet.Identity.UserManager' 不包含“FindByEmail”的定义且没有扩展名 方法“FindByEmail”接受类型为的第一个参数 “Microsoft.AspNet.Identity.UserManager”可以是 找到（是否缺少using指令或程序集 参考？“…”

---

FindByEmail是在ASP.NET Identity 2.0中添加的（请参见声明）

让FindByEmail安装最新的软件包

• Microsoft.AspNet.Identity.EntityFramework

• Microsoft.AspNet.Identity.Core

• Microsoft.AspNet.Identity.OWIN