你在这里缺少的是从Facebook获取电子邮件地址的额外权限。
请查看以下两个屏幕截图,第二个屏幕截图请求额外信息,包括电子邮件地址。
基本权限
![enter image description here](https://istack.dev59.com/40vws.webp)
更多权限
![enter image description here](https://istack.dev59.com/JQjo7.webp)
为了做到这一点,您需要将此附加的必需信息作为“范围”提供。
我今天写了一个小教程,介绍如何使用Facebook登录,可以在这里阅读 - 使用Facebook登录与ASP.NET MVC 4。这将回答您大部分的问题。
对于您的问题,以下是您应该执行的操作:
创建一个FacebookScopedClient类(以下是代码),然后在您的AuthConfig.cs中像这样使用它
var facebooksocialData = new Dictionary<string, object>();
facebooksocialData.Add("scope", "email, publish_stream, read_stream");
OAuthWebSecurity.RegisterClient(new FacebookScopedClient(
appId: "xxxxxxxx",
appSecret: "xxxxxxxxxxxxxxxxxxx",
scope:"email, user_likes, friends_likes, user_birthday),
"Facebook",
null
);
FacebookScopedClient类的代码 -
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Web;
using DotNetOpenAuth.AspNet;
using Newtonsoft.Json;
public class FacebookScopedClient : IAuthenticationClient
{
private string appId;
private string appSecret;
private string scope;
private const string baseUrl = "https://www.facebook.com/dialog/oauth?client_id=";
public const string graphApiToken = "https://graph.facebook.com/oauth/access_token?";
public const string graphApiMe = "https://graph.facebook.com/me?";
private static string GetHTML(string URL)
{
string connectionString = URL;
try
{
System.Net.HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(connectionString);
myRequest.Credentials = CredentialCache.DefaultCredentials;
WebResponse webResponse = myRequest.GetResponse();
Stream respStream = webResponse.GetResponseStream();
StreamReader ioStream = new StreamReader(respStream);
string pageContent = ioStream.ReadToEnd();
ioStream.Close();
respStream.Close();
return pageContent;
}
catch (Exception)
{
}
return null;
}
private IDictionary<string, string> GetUserData(string accessCode, string redirectURI)
{
string token = GetHTML(graphApiToken + "client_id=" + appId + "&redirect_uri=" + HttpUtility.UrlEncode(redirectURI) + "&client_secret=" + appSecret + "&code=" + accessCode);
if (token == null || token == "")
{
return null;
}
string access_token = token.Substring(token.IndexOf("access_token="), token.IndexOf("&"));
string data = GetHTML(graphApiMe + "fields=id,name,email,username,gender,link&" + access_token);
Dictionary<string, string> userData = JsonConvert.DeserializeObject<Dictionary<string, string>>(data);
return userData;
}
public FacebookScopedClient(string appId, string appSecret, string scope)
{
this.appId = appId;
this.appSecret = appSecret;
this.scope = scope;
}
public string ProviderName
{
get { return "Facebook"; }
}
public void RequestAuthentication(System.Web.HttpContextBase context, Uri returnUrl)
{
string url = baseUrl + appId + "&redirect_uri=" + HttpUtility.UrlEncode(returnUrl.ToString()) + "&scope=" + scope;
context.Response.Redirect(url);
}
public AuthenticationResult VerifyAuthentication(System.Web.HttpContextBase context)
{
string code = context.Request.QueryString["code"];
string rawUrl = context.Request.Url.OriginalString;
rawUrl = Regex.Replace(rawUrl, "&code=[^&]*", "");
IDictionary<string, string> userData = GetUserData(code, rawUrl);
if (userData == null)
return new AuthenticationResult(false, ProviderName, null, null, null);
string id = userData["id"];
string username = userData["username"];
userData.Remove("id");
userData.Remove("username");
AuthenticationResult result = new AuthenticationResult(true, ProviderName, id, username, userData);
return result;
}
}
参考资料: