Azure AD B2C令牌返回名称，但User.Identity.Name为空

问题描述

我有一个Azure AD B2C令牌，它似乎正确返回了当前登录用户的名称.这是jwt.ms的屏幕截图，登录后我将用它来解码应用程序返回的令牌:

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，然后我尝试在_Layout.cshtml中使用@User.Identity.Name.为什么它为空?它不应该等于屏幕截图中的名称"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

事实证明我缺少注释标记的行:

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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