如何在成功登錄後立即在控制器中獲取身份用戶ID？

Question

我正在使用Identity v2和MVC 5進行外部登錄。

在我的外部登錄的回調函數，我登錄與

var result = await SignInManager.ExternalSignInAsync(loginInfo, isPersistent: false); 

再有就是對result交換機的用戶，我需要訪問的success情況下，用戶的ID，但User.Identity.GetUserId();給我這裏是null。

在這種情況下，我如何訪問用戶的ID？

Answer 1

要獲得簽名的理賠數據和其他信息身份立即成功登錄後，無需訪問數據庫，只需訪問signinManager.AuthenticationManager.AuthenticationResponseGrant.Identity即可。

例如，

switch (result) { case SignInStatus.Success: var userId = signinManager.AuthenticationManager.AuthenticationResponseGrant .Identity.GetUserId(); // ...

你也可以看到它在this other question's answer使用登錄後立即添加到身份的新要求 - AuthenticationManager.AuthenticationResponseGrant.Identity.AddClaims(freshClaims);

Answer 2

好的，我找到了one way;我可以通過：

var userID = UserManager.FindByEmail(loginInfo.Email).Id; 

但是，我不認爲這是最好的解決方案，因爲它似乎是我打兩個查詢數據庫。任何人都能提供更好的解決方案

Answer 3

你可以使用下面的代碼。

Add功能ApplicationSignInManager類Identity.Config.cs

public override Task SignInAsync(ApplicationUser user, bool isPersistent, bool rememberBrowser) 
{ 
      var claims = new List<Claim>() 
      { 
       new Claim(ClaimTypes.NameIdentifier, user.Id), 
       new Claim(ClaimTypes.Email, user.Email) 
      }; 
      this.AuthenticationManager.User.AddIdentity(new ClaimsIdentity(claims)); 
      return base.SignInAsync(user, isPersistent, rememberBrowser); 
} 

嘗試的部份代碼

private ClaimsPrincipal GetCurrentUser() 
     { 
      var context = HttpContext.GetOwinContext(); 
      if (context == null) 
       return null; 

      if (context.Authentication == null || context.Authentication.User == null) 
       return null; 

      return context.Authentication.User; 
     } 
     private string GetUserId() 
     { 
      var user = GetCurrentUser(); 
      if (user == null) 
       return null; 

      var claim = user.Claims.FirstOrDefault(o => o.Type == ClaimTypes.NameIdentifier); 
      if (claim == null) 
       return null; 

      return claim.Value; 
     } 

     private string GetUserEmail() 
     { 
      var user = GetCurrentUser(); 
      if (user == null) 
       return null; 

      var claim = user.Claims.FirstOrDefault(o => o.Type == ClaimTypes.Email); 
      if (claim == null) 
       return null; 

      return claim.Value; 
     } 

Answer 4

我用System.Security.Claims.ClaimTypes.NameIdentifier對象，以保持我的用戶ID

我創建了一個幫助類來達到它的值

public class UserHelper 
    { 
    public static string GetUserId() 
    { 
     var identity = (System.Security.Claims.ClaimsPrincipal)System.Threading.Thread.CurrentPrincipal; 
     var principal = System.Threading.Thread.CurrentPrincipal as System.Security.Claims.ClaimsPrincipal; 
     var userId = identity.Claims.Where(c => c.Type == System.Security.Claims.ClaimTypes.NameIdentifier).Select(c => c.Value).SingleOrDefault(); 
     return userId; 
    } 
    public static string GetUserName() 
    { 
     var identity = (System.Security.Claims.ClaimsPrincipal)System.Threading.Thread.CurrentPrincipal; 
     var principal = System.Threading.Thread.CurrentPrincipal as System.Security.Claims.ClaimsPrincipal; 
     var name = identity.Claims.Where(c => c.Type == System.Security.Claims.ClaimTypes.Name).Select(c => c.Value).SingleOrDefault(); 
     return name; 
    } 
    public static string GetUserMail() 
    { 
     var identity = (System.Security.Claims.ClaimsPrincipal)System.Threading.Thread.CurrentPrincipal; 
     var principal = System.Threading.Thread.CurrentPrincipal as System.Security.Claims.ClaimsPrincipal; 
     var mail = identity.Claims.Where(c => c.Type == System.Security.Claims.ClaimTypes.Email).Select(c => c.Value).SingleOrDefault(); 
     return mail; 
    } 
    } 

，我把它與

var user = UserHelper.GetUserId();