Move MapOpenApi() Inside the IsDevelopment() block for consistency wi… (#34541)

* Move MapOpenApi() Inside the IsDevelopment() block for consistency with templates and other docs

The default template with .NET 9 has MapOpenApi() inside the IsDevelopment block. Many examples on MS Learn also have it inside due to limit information exposure. 

Move inside to minimize potential for confusion to devs.

* Conditionally map all calls to OpenApi in development environment

* Combined MapOpenAPI and MapScalar in same env condition

Line 501, moved app.MapOpenAPI() to same environment condition block for app.MapScalarApiReference()

* Updated code highlight

---------

Co-authored-by: Wade Pickett <wpickett@microsoft.com>

Author: davepcallan

aspnetcore/fundamentals/openapi/aspnetcore-openapi.md

@@ -5,7 +5,7 @@ description: Learn how to generate and customize OpenAPI documents in an ASP.NET
 ms.author: safia
 monikerRange: '>= aspnetcore-6.0'
 ms.custom: mvc
-ms.date: 12/11/2024
+ms.date: 01/23/2025
 uid: fundamentals/openapi/aspnetcore-openapi
 ---
 # Generate OpenAPI documents
@@ -48,7 +48,7 @@ The following code:
 * Adds OpenAPI services using the <xref:Microsoft.Extensions.DependencyInjection.OpenApiServiceCollectionExtensions.AddOpenApi%2A> extension method on the app builder's service collection.
 * Maps an endpoint for viewing the OpenAPI document in JSON format with the <xref:Microsoft.AspNetCore.Builder.OpenApiEndpointRouteBuilderExtensions.MapOpenApi%2A> extension method on the app.
 
-[!code-csharp[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/Program.cs?name=snippet_first&highlight=3,7)]
+[!code-csharp[](~/fundamentals/openapi/samples/9.x/WebMinOpenApi/Program.cs?name=snippet_first&highlight=3,9)]
 
 Launch the app and navigate to `https://localhost:<port>/openapi/v1.json` to view the generated OpenAPI document.
 

aspnetcore/fundamentals/openapi/samples/9.x/WebMinOpenApi/Program.cs

@@ -3,7 +3,6 @@
 //#define DOCUMENTtransformer1
 //#define DOCUMENTtransformer2
 #define DOCUMENTtransformerUse999
-//#define DEFAULT
 //#define FIRST
 //#define OPENAPIWITHSCALAR
 //#define MAPOPENAPIWITHCACHING
@@ -80,7 +79,10 @@ internal record WeatherForecast(DateTime Date, int TemperatureC, string? Summary
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/", () => "Hello world!");
 
@@ -107,7 +109,10 @@ internal record WeatherForecast(DateTime Date, int TemperatureC, string? Summary
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/", () => "Hello world!");
 
@@ -161,7 +166,10 @@ public async Task TransformAsync(OpenApiDocument document, OpenApiDocumentTransf
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/", () => "Hello world!");
 
@@ -189,7 +197,10 @@ public async Task TransformAsync(OpenApiDocument document, OpenApiDocumentTransf
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/world", () => "Hello world!")
     .WithGroupName("internal");
@@ -253,7 +264,10 @@ public async Task TransformAsync(OpenApiDocument document, OpenApiDocumentTransf
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/", () => new Body { Amount = 1.1m });
 
@@ -279,9 +293,10 @@ public class Body {
 
 var app = builder.Build();
 
-app.MapOpenApi();
 if (app.Environment.IsDevelopment())
 {
+    app.MapOpenApi();
+    
     app.UseSwaggerUI(options =>
     {
         options.SwaggerEndpoint("/openapi/v1.json", "v1");
@@ -342,8 +357,11 @@ public class Body {
 
 app.UseOutputCache();
 
-app.MapOpenApi()
-    .CacheOutput();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi()
+        .CacheOutput();
+}
 
 app.MapGet("/", () => "Hello world!");
 
@@ -365,10 +383,9 @@ public class Body {
 
 var app = builder.Build();
 
-app.MapOpenApi();
-
 if (app.Environment.IsDevelopment())
 {
+    app.MapOpenApi();
     app.MapScalarApiReference();
 }
 
@@ -386,7 +403,10 @@ public class Body {
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/", () => "Hello world!");
 
@@ -419,7 +439,10 @@ public class Body {
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/", () => "Hello world!");
 
@@ -473,7 +496,10 @@ public Task TransformAsync(OpenApiSchema schema, OpenApiSchemaTransformerContext
 
 var app = builder.Build();
 
-app.MapOpenApi();
+if (app.Environment.IsDevelopment())
+{
+    app.MapOpenApi();
+}
 
 app.MapGet("/", () => "Hello world!");