如何在 Azure Active Directory 中使用多个 OpenIdConnectAuthenticationOptions

在我们的项目中，我们想要显示两个选项（以员工身份登录和以客户身份登录）。根据选择，我们希望使用 Azure Active Directory B2B 或 Azure B2C 对用户进行身份验证。

我可以将身份验证模式设置为被动并在单击链接后打开登录页面。配置单个 OpenIdConnectAuthenticationOptions 时效果很好。但当我配置多个 OpenIdConnectAuthenticationOptions 时，这不起作用。

        app.UseOpenIdConnectAuthentication(
            new OpenIdConnectAuthenticationOptions
            {
                AuthenticationMode = AuthenticationMode.Passive,
                MetadataAddress = String.Format(aadInstance2, tenant2, SignUpSignInPolicyId),
                ClientId = clientId2,
                RedirectUri = redirectUri2,
                PostLogoutRedirectUri = postLogoutRedirectUri,
            });

        app.UseOpenIdConnectAuthentication(
            new OpenIdConnectAuthenticationOptions
            {
                AuthenticationMode = AuthenticationMode.Passive,
                ClientId = clientId,
                Authority = authority,
                PostLogoutRedirectUri = postLogoutRedirectUri,
            });

    public void Redirect()
    {
       HttpContext.GetOwinContext().Authentication.Challenge(new AuthenticationProperties { RedirectUri = "https://localhost/WebApp1/" }, OpenIdConnectAuthenticationDefaults.AuthenticationType);
    }

你可以尝试使用AuthenticationType。该属性标识管道中的该中间件，并用于引用它进行身份验证操作。例如，您可以定义如下配置：

app.UseOpenIdConnectAuthentication(
    new OpenIdConnectAuthenticationOptions("AADLogin")
    {
        AuthenticationMode = AuthenticationMode.Passive,
        MetadataAddress = String.Format(aadInstance2, tenant2, SignUpSignInPolicyId),
        ClientId = clientId2,
        RedirectUri = redirectUri2,
        PostLogoutRedirectUri = postLogoutRedirectUri,
    });

app.UseOpenIdConnectAuthentication(
    new OpenIdConnectAuthenticationOptions("B2CLogin")
    {
        AuthenticationMode = AuthenticationMode.Passive,
        ClientId = clientId,
        Authority = authority,
        PostLogoutRedirectUri = postLogoutRedirectUri,
    });

然后根据用户的选择，您可以选择使用哪一个：

    if ()
    {
        HttpContext.GetOwinContext()
            .Authentication.Challenge(new AuthenticationProperties {RedirectUri = "/"},
               "AADLogin");
    }
    else
    {
        HttpContext.GetOwinContext()
           .Authentication.Challenge(new AuthenticationProperties { RedirectUri = "/" },
              "B2CLogin");
    }