Adding IApplicationBuilder.UseTokenAcquirerFactory

src/Microsoft.Identity.Web.TokenAcquisition/AspNetCore/ApplicationBuilderExtensions.cs

@@ -0,0 +1,22 @@
+using Microsoft.AspNetCore.Builder;
+
+namespace Microsoft.Identity.Web
+{
+    /// <summary>
+    /// Extension class on IApplicationBuilder to initialize the service provider of
+    /// the TokenAcquirerFactory in ASP.NET Core.
+    /// </summary>
+    public static class ApplicationBuilderExtensions
+    {
+        /// <summary>
+        /// Uses the token acquirer factory, therefore 
+        /// </summary>
+        /// <param name="applicationBuilder"></param>
+        /// <returns></returns>
+        public static IApplicationBuilder UseTokenAcquirerFactory(this IApplicationBuilder applicationBuilder)
+        {
+            TokenAcquirerFactory.GetDefaultInstance().ServiceProvider = applicationBuilder.ApplicationServices;
+            return applicationBuilder;
+        }
+    }
+}

src/Microsoft.Identity.Web.TokenAcquisition/TokenAcquirerFactory.cs

@@ -26,7 +26,7 @@ public class TokenAcquirerFactory : ITokenAcquirerFactory
         /// <summary>
         /// Service Provider
         /// </summary>
-        public IServiceProvider? ServiceProvider { get; protected set; }
+        public IServiceProvider? ServiceProvider { get; protected internal set; }
 
         /// <summary>
         /// Services. Used in the initialization phase.

tests/WebAppCallsMicrosoftGraph/Startup.cs

@@ -107,6 +107,7 @@ public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
 
             app.UseAuthentication();
             app.UseAuthorization();
+            app.UseTokenAcquirerFactory();
 
             app.UseEndpoints(endpoints =>
             {