Update code from .NET 5 to .NET 6

Use the Program.cs file instead of the legacy Startup.cs file.

Author: vanillajonathan

articles/active-directory/develop/scenario-web-api-call-api-app-configuration.md

@@ -81,27 +81,19 @@ Instead of a client secret, you can provide a client certificate. The following
 
 Microsoft.Identity.Web provides several ways to describe certificates, both by configuration or by code. For details, see [Microsoft.Identity.Web wiki - Using certificates](https://github.com/AzureAD/microsoft-identity-web/wiki/Using-certificates) on GitHub.
 
-## Startup.cs
+## Program.cs
 
-Your web API will need to acquire a token for the downstream API. You specify it by adding the `.EnableTokenAcquisitionToCallDownstreamApi()` line after `.AddMicrosoftIdentityWebApi(Configuration)`. This line exposes the `ITokenAcquisition` service, that you can use in your controller/pages actions. However, as you'll see in the next two bullet points, you can do even simpler. You'll also need to choose a token cache implementation, for example `.AddInMemoryTokenCaches()`, in *Startup.cs*:
+Your web API will need to acquire a token for the downstream API. You specify it by adding the `.EnableTokenAcquisitionToCallDownstreamApi()` line after `.AddMicrosoftIdentityWebApi(Configuration)`. This line exposes the `ITokenAcquisition` service, that you can use in your controller/pages actions. However, as you'll see in the next two bullet points, you can do even simpler. You'll also need to choose a token cache implementation, for example `.AddInMemoryTokenCaches()`, in *Program.cs*:
 
 ```csharp
 using Microsoft.Identity.Web;
 
-public class Startup
-{
-    // ...
-    public void ConfigureServices(IServiceCollection services)
-    {
-        // ...
-        services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
-                .AddMicrosoftIdentityWebApi(Configuration, Configuration.GetSection("AzureAd"))
-                .EnableTokenAcquisitionToCallDownstreamApi()
-                .AddInMemoryTokenCaches();
-        // ...
-    }
-    // ...
-}
+// ...
+builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+    .AddMicrosoftIdentityWebApi(Configuration, Configuration.GetSection("AzureAd"))
+    .EnableTokenAcquisitionToCallDownstreamApi()
+    .AddInMemoryTokenCaches();
+// ...
 ```
 
 If you don't want to acquire the token yourself, *Microsoft.Identity.Web* provides two mechanisms for calling a downstream web API from another API. The option you choose depends on whether you want to call Microsoft Graph or another API.
@@ -111,26 +103,18 @@ If you don't want to acquire the token yourself, *Microsoft.Identity.Web* provid
 If you want to call Microsoft Graph, Microsoft.Identity.Web enables you to directly use the `GraphServiceClient` (exposed by the Microsoft Graph SDK) in your API actions. To expose Microsoft Graph:
 
 1. Add the [Microsoft.Identity.Web.MicrosoftGraph](https://www.nuget.org/packages/Microsoft.Identity.Web.MicrosoftGraph) NuGet package to your project.
-1. Add `.AddMicrosoftGraph()` after `.EnableTokenAcquisitionToCallDownstreamApi()` in the *Startup.cs* file. `.AddMicrosoftGraph()` has several overrides. Using the override that takes a configuration section as a parameter, the code becomes:
+1. Add `.AddMicrosoftGraph()` after `.EnableTokenAcquisitionToCallDownstreamApi()` in the *Program.cs* file. `.AddMicrosoftGraph()` has several overrides. Using the override that takes a configuration section as a parameter, the code becomes:
 
 ```csharp
 using Microsoft.Identity.Web;
 
-public class Startup
-{
-    // ...
-    public void ConfigureServices(IServiceCollection services)
-    {
-        // ...
-        services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
-                .AddMicrosoftIdentityWebApi(Configuration, Configuration.GetSection("AzureAd"))
-                .EnableTokenAcquisitionToCallDownstreamApi()
-                .AddMicrosoftGraph(Configuration.GetSection("GraphBeta"))
-                .AddInMemoryTokenCaches();
-        // ...
-    }
-    // ...
-}
+// ...
+builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+    .AddMicrosoftIdentityWebApi(Configuration, Configuration.GetSection("AzureAd"))
+    .EnableTokenAcquisitionToCallDownstreamApi()
+    .AddMicrosoftGraph(Configuration.GetSection("GraphBeta"))
+    .AddInMemoryTokenCaches();
+// ...
 ```
 
 ### Option 2: Call a downstream web API other than Microsoft Graph
@@ -140,26 +124,18 @@ To call a downstream API other than Microsoft Graph, *Microsoft.Identity.Web* pr
 ```csharp
 using Microsoft.Identity.Web;
 
-public class Startup
-{
-    // ...
-    public void ConfigureServices(IServiceCollection services)
-    {
-        // ...
-        services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
-                .AddMicrosoftIdentityWebApi(Configuration, "AzureAd")
-                .EnableTokenAcquisitionToCallDownstreamApi()
-                .AddDownstreamWebApi("MyApi", Configuration.GetSection("GraphBeta"))
-                .AddInMemoryTokenCaches();
-        // ...
-    }
-    // ...
-}
+// ...
+builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+    .AddMicrosoftIdentityWebApi(Configuration, "AzureAd")
+    .EnableTokenAcquisitionToCallDownstreamApi()
+    .AddDownstreamWebApi("MyApi", Configuration.GetSection("GraphBeta"))
+    .AddInMemoryTokenCaches();
+// ...
 ```
 
 As with web apps, you can choose various token cache implementations. For details, see [Microsoft identity web - Token cache serialization](https://aka.ms/ms-id-web/token-cache-serialization) on GitHub.
 
-The following image shows the various possibilities of *Microsoft.Identity.Web* and their impact on the *Startup.cs* file:
+The following image shows the various possibilities of *Microsoft.Identity.Web* and their impact on the *Program.cs* file:
 
 :::image type="content" source="media/scenarios/microsoft-identity-web-startup-cs.svg" alt-text="Block diagram showing service configuration options in startup dot C S for calling a web API and specifying a token cache implementation":::