ASP.NET MVC Identityキャラクター追加

using Microsoft.AspNet.Identity;

public ActionResult AddRole(String name)
{ 　　using (var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(new IdentityDbContext())))
 {
　　　　if (!roleManager.RoleExists(name)) 　　　　{
　　　　　　roleManager.Create(new IdentityRole(name));
　　　　}
　　}
} 


     ：

1、  App_Start\IdentityConfig.cs               
public class ApplicationRoleManager : RoleManager<IdentityRole>
{
　　public ApplicationRoleManager(IRoleStore<IdentityRole, string> roleStore) : base(roleStore)
　　{
　　}
　　public static ApplicationRoleManager Create(IdentityFactoryOptions<ApplicationRoleManager> options, IOwinContext context)
　　{
　　　　return new ApplicationRoleManager(new RoleStore<IdentityRole>(context.Get<ApplicationDbContext>()));
　　}
}

2、  App_Start\Startup.Auth.cs       app.CreatePerOwinContext<ApplicationRoleManager>(ApplicationRoleManager.Create);
public void ConfigureAuth(IAppBuilder app)
{
　　//         、           ，             
　　app.CreatePerOwinContext(ApplicationDbContext.Create);
　　app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
　　app.CreatePerOwinContext<ApplicationRoleManager>(ApplicationRoleManager.Create);
　　app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);
　　......
}

3、       ，      ，     RoleManager   
private ApplicationRoleManager _roleManager;
public ApplicationRoleManager RoleManager
{
　　get
　　{
　　　　return _roleManager ?? HttpContext.GetOwinContext().Get<ApplicationRoleManager>();
　　}
　　private set
　　{
　　　　_roleManager = value;
　　}
}

             、        。
var result = await RoleManager.CreateAsync(new IdentityRole(name));
var result = await RoleManager.UpdateAsync(role);
var result = await RoleManager.DeleteAsync(role);