blocks|key|203020|text|好了，我知道为什么它是空的了。您必须在Google控制台中启用Google+%2B+API。还要确保在将密钥粘贴到代码后，密钥不会与末尾的空格连接。为什么他们不能返回一个正常的错误？我不知道。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|203021|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

OK, I found out why it's null. You have to enable Google + API in the Google console. Also make sure the secret key is not concatenated with a space at the end after you paste it to your code. Why can't they return a normal error? I don't know.

blocks|key|203161|text|我通过简单地更新应用程序中的所有nugget包来让它工作，并且它工作了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|203162|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I got it to work by simply updating all the nugget package in the application and it worked.

blocks|key|4708753|text|我知道这很愚蠢，但经过长时间的努力，重新启动IIS为我解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4708754|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I know it's silly, but after a long struggle, restarting IIS solved the issue for me.

blocks|key|4708816|text|为了让它正常工作，我做了以下工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4708817|登录到开发人员门户，找到您的应用程序并执行以下操作。|4708818|应用程序详细信息>以应用程序为中心列出的平台>为网站选择是|4708819|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

I did the following to get it working.
Logon to the developer portal, locate your application and do the following.
<h2>App details &gt; App centered Listed Platforms &gt; Select Yes for website</h2>

blocks|key|203129|text|我今天遇到了这个问题，结果是我在分配提供者之后定义了远程cookie。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|203130|确保你把..。|203131|app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);|code-block|syntax|javascript|203132|之前..。|203133|app.UseFacebookAuthentication(
+++++++++++++++++++appId:+"",
+++++++++++++++++++appSecret:+"");|203134|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|Q|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

I ran in to this issue today and it turned out that I defined the remote cookie after I assigned the providers.

Make sure you place...

<pre><code>app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);
</code></pre>

before...

<pre><code>app.UseFacebookAuthentication(
 appId: "",
 appSecret: "");
</code></pre>

blocks|key|4709035|text|对于那些在Web+Api上遇到这个问题的人。其他的解决方案也没有帮助，即使启用了google+plus+api，AuthenticationManager.GetExternalLoginInfoAsync();也总是返回空值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4709036|使用此自定义函数获取logininfo。显然，微软在通过web+api请求时，GetExternalLoginInfoAsync有一个bug。|4709037|private+async+Task<ExternalLoginInfo>+AuthenticationManager_GetExternalLoginInfoAsync_WithExternalBearer()
++++++++{
++++++++++++ExternalLoginInfo+loginInfo+=+null;

++++++++++++var+result+=+await+Authentication.AuthenticateAsync(DefaultAuthenticationTypes.ExternalBearer);

++++++++++++if+(result+!=+null+&&+result.Identity+!=+null)
++++++++++++{
++++++++++++++++var+idClaim+=+result.Identity.FindFirst(ClaimTypes.NameIdentifier);
++++++++++++++++if+(idClaim+!=+null)
++++++++++++++++{
++++++++++++++++++++loginInfo+=+new+ExternalLoginInfo()
++++++++++++++++++++{
++++++++++++++++++++++++DefaultUserName+=+result.Identity.Name+==+null+?+""+:+result.Identity.Name.Replace("+",+""),
++++++++++++++++++++++++Login+=+new+UserLoginInfo(idClaim.Issuer,+idClaim.Value)
++++++++++++++++++++};
++++++++++++++++}
++++++++++++}
++++++++++++return+loginInfo;
++++++++}|code-block|syntax|javascript|4709038|entityMap^0|1K|1E|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|S|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

For those who are experiencing this problem for Web Api. Other solutions doesnt help <code>AuthenticationManager.GetExternalLoginInfoAsync();</code> returns always null even google plus api is enabled.

use this custom function to get logininfo. obviously Microsoft has a bug for GetExternalLoginInfoAsync when requesting over web api.

<pre><code>private async Task&lt;ExternalLoginInfo&gt; AuthenticationManager_GetExternalLoginInfoAsync_WithExternalBearer()
 {
 ExternalLoginInfo loginInfo = null;

 var result = await Authentication.AuthenticateAsync(DefaultAuthenticationTypes.ExternalBearer);

 if (result != null &amp;&amp; result.Identity != null)
 {
 var idClaim = result.Identity.FindFirst(ClaimTypes.NameIdentifier);
 if (idClaim != null)
 {
 loginInfo = new ExternalLoginInfo()
 {
 DefaultUserName = result.Identity.Name == null ? "" : result.Identity.Name.Replace(" ", ""),
 Login = new UserLoginInfo(idClaim.Issuer, idClaim.Value)
 };
 }
 }
 return loginInfo;
 }
</code></pre>

blocks|key|4708911|text|经过多次搜索和挠头，以及在Stackoverflow上关注大量的转移注意力的答案，我最终在谷歌开发控制台上浏览了所有选项，在Google%2BAPI概述页面上发现了一个蓝色的启用小按钮。我点击了这个，嘿，很快它就起作用了。忘掉你读到的关于回调url和路由配置的胡说八道吧，OWIN在任何情况下都会覆盖google+default+/signin-google+redirect+uri并把你送回ExternalLoginCallback。只要你启用了你的Google%2BAPI，只要坚持默认的实现，一切都会好的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4708912|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

After much searching and head scratching as well as following numerous red herring answers here on Stackoverflow I eventually went through all my options on my Google dev console and discovered a little blue [Enable] button on the Google+API overview page. I clicked this and hey presto it worked. Forget all the baloney you read about callback url and route configs, OWIN overrides the google default /signin-google redirect uri in any case and sends you back to ExternalLoginCallback. Just stick with the default implementation all will be good so long as you enable your Google+API.

blocks|key|203203|text|这是真的，你将需要谷歌%2B启用。对我来说最重要的是项目的URL。在VS中打开属性窗口(查看->属性窗口)，然后右键单击项目并选择属性。在较小的属性窗口中复制您的SSL+URL，然后在较大的属性窗口中选择Web选项卡，并将该URL粘贴到项目URL中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|203204|为我修复了这个问题。|203205|请参阅更多详细信息：https://docs.microsoft.com/en-us/aspnet/mvc/overview/security/create-an-aspnet-mvc-5-app-with-facebook-and-google-oauth2-and-openid-sign-on|offset|length|203206|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.microsoft.com/en-us/aspnet/mvc/overview/security/create-an-aspnet-mvc-5-app-with-facebook-and-google-oauth2-and-openid-sign-on^0|0|0|A|3V|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

It is true that you are going to need the Google plus Enabled. The big thing for me was the project URL. Open the properties window (View -> Properties Window) in VS and then right click the project and select properties. In small properties window copy your SSL URL, and then in the larger properties window select the Web tab and paste that URL in the Project URL.

Fixed the issue for me. 

See in greater detail: <a href="https://docs.microsoft.com/en-us/aspnet/mvc/overview/security/create-an-aspnet-mvc-5-app-with-facebook-and-google-oauth2-and-openid-sign-on" rel="nofollow noreferrer">https://docs.microsoft.com/en-us/aspnet/mvc/overview/security/create-an-aspnet-mvc-5-app-with-facebook-and-google-oauth2-and-openid-sign-on</a>

blocks|key|203212|text|在我的例子中，解决方案是更新Nuget包、Microsoft.Owin.Security和Microsoft.Owin.Security.Google|type|unstyled|depth|inlineStyleRanges|entityRanges|data|203213|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

In my case the solution was update Nuget package Microsoft.Owin.Security and Microsoft.Owin.Security.Google

blocks|key|203038|text|所有其他答案都不能为我解决这个问题，所以如果你在同一条船上，那么请确保你的注册控制器操作具有RequireHttps属性：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|203039|++++//+GET:+/Account/LoginRegister
++++[AllowAnonymous]
++++[RequireHttps]
++++public+ActionResult+LoginRegister()
++++{
++++++++return+View(new+RegisterLoginViewModel());
++++}|code-block|syntax|javascript|203040|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

All of the other answers didn't solve this for me, so if your in the same boat then make sure your registration controller action has the RequireHttps attribute:

<pre><code> // GET: /Account/LoginRegister
 [AllowAnonymous]
 [RequireHttps]
 public ActionResult LoginRegister()
 {
 return View(new RegisterLoginViewModel());
 }
</code></pre>

I've created a new MVC5 Web Application, and when I try to login with Google or Facebook, the <code>ExternalLoginCallback</code> Action in the <code>AccountController</code> is called, but <code>GetExternalLoginInfoAsync()</code> always returns null:

<pre><code>var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync();
if (loginInfo == null)
{
 return RedirectToAction("Login");
}
</code></pre>

Because it's always null, it just redirects back to the login page and the process starts over. How can I fix this?

OWIN's GetExternalLoginInfoAsync Always Returns null

路由

我已经创建了一个新的Facebook应用程序，当我尝试登录MVC5或MVC5时，AccountController中的ExternalLoginCallback操作会被调用，但GetExternalLoginInfoAsync()总是返回null：var loginInfo = await AuthenticationManager.GetExternalLoginInfoAsync();if (

问OWIN的GetExternalLoginInfoAsync始终返回null
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