Question

我正在使用Microsoft.Owin.Security.Cookies.dll，v3.0.0.0，并尝试使用此代码创建CookieAuthenticationProvider的对象类型：

var provider= new  CookieAuthenticationProvider
{
    OnResponseSignIn =  async  context  =>
        {
            var claims=await GetClaims(identity.Name); //I get the claims here.
            context.Identity.AddClaims(clais); //The claims are being added.
        }
}

执行此操作后，我收到错误消息＆＃34;异步模块或处理程序在异步操作仍未完成时已完成。＆＃34;

方法GetClaims（）如下所示：

public virtual async Task<IEnumerable<Claim>> GetClaims(String test)
    {
      .....var claims=await GetInfo(test);

      return claims;
    }

如果我从OnResponseSignIn中移除异步并使GetClaims（）同步一切正常。

我做错了什么？如果我想让OnResponseSignIn异步和GetClaims（）等待，那么正确的方法是什么？

Answer 1

我不知道你是如何检索索赔的，但根据我对异步的经验，我会做这样的事情。

 private Task<List<Claim>> GetClaims(string name)
        {
            // Get your claim here.
        }

在configureAuth中我会做

public void ConfigureAuth(IAppBuilder app)
        {
            Func<CookieResponseSignInContext, Task> asyncFunc = async ctx =>
            {
                var claims = await GetClaims(ctx.Identity.Name);
                ctx.Identity.AddClaims(claims);
            };

            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
                LoginPath = new PathString("/Account/Login"),
                Provider = new CookieAuthenticationProvider
                {
                    // Enables the application to validate the security stamp when the user logs in.
                    // This is a security feature which is used when you change a password or add an external login to your account.  
                    OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager, ApplicationUser>(
                       validateInterval: TimeSpan.FromMinutes(30),
                       regenerateIdentity: (manager, user) => user.GenerateUserIdentityAsync(manager)),
                    OnResponseSignIn = context =>
                    {
                        asyncFunc(context);
                    }
                }
            });
           .....
}

为什么异步功能不等待完成？

1 个答案: