Azure AD B2C 令牌返回名称，但 User.Identity.Name 为空 [英] Azure AD B2C Token returns name but User.Identity.Name is null

问题描述

我有一个 Azure AD B2C 令牌，它似乎正确地返回了当前登录的用户名.这是我登录后用于解码应用程序返回的令牌的 jwt.ms 的屏幕截图:

I have an Azure AD B2C token that seems to be correctly returning the currently logged-in user's name. Here is a screenshot from jwt.ms which I am using to decode the token returned by the application after I have logged in:

但是，我尝试在 _Layout.cshtml 中使用 @User.Identity.Name.为什么它是空的?不应该等于截图中的name"值吗?

However, then I attempt to use @User.Identity.Name in my _Layout.cshtml. Why is it null? Shouldn't it be equal to the "name" value in the screenshot?

推荐答案

原来我错过了注释标记的行:

It turned out I was missing the line marked by the comments:

        app.UseOpenIdConnectAuthentication(
            new OpenIdConnectAuthenticationOptions
            {
                // Generate the metadata address using the tenant and policy information
                MetadataAddress = String.Format(AadInstance, Tenant, DefaultPolicy),

                // These are standard OpenID Connect parameters, with values pulled from web.config
                ClientId = ClientId,
                Authority = Authority,
                PostLogoutRedirectUri = RedirectUri,
                RedirectUri = RedirectUri,

                Notifications = new OpenIdConnectAuthenticationNotifications()
                {
                    RedirectToIdentityProvider = OnRedirectToIdentityProvider,
                    AuthenticationFailed = OnAuthenticationFailed,
                    AuthorizationCodeReceived = OnAuthorizationCodeReceived,
                },

                //////// WAS MISSING THIS BELOW /////////
                // Specify the claims to validate
                TokenValidationParameters = new TokenValidationParameters
                {
                    // This claim is in the Azure AD B2C token; this code tells the web app to "absorb" the token "name" and place it in the user object
                    NameClaimType = "name"
                },

                // Specify the scope by appending all of the scopes requested into one string (separated by a blank space)
                Scope = $"{OpenIdConnectScopes.OpenId} {ReadTasksScope} {WriteTasksScope}"
            }
        );

整个文件位于此处:https://github.com/Azure-Samples/active-directory-b2c-dotnet-webapp-and-webapi/blob/master/TaskWebApp/App_Start/Startup.Auth.cs

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