Update Microsoft.OpenApi to preview28 (dotnet#62363)

Author: captainsafia

eng/Versions.props

@@ -323,8 +323,8 @@
     <XunitExtensibilityCoreVersion>$(XunitVersion)</XunitExtensibilityCoreVersion>
     <XunitExtensibilityExecutionVersion>$(XunitVersion)</XunitExtensibilityExecutionVersion>
     <MicrosoftDataSqlClientVersion>5.2.2</MicrosoftDataSqlClientVersion>
-    <MicrosoftOpenApiVersion>2.0.0-preview.18</MicrosoftOpenApiVersion>
-    <MicrosoftOpenApiYamlReaderVersion>2.0.0-preview.18</MicrosoftOpenApiYamlReaderVersion>
+    <MicrosoftOpenApiVersion>2.0.0-preview.29</MicrosoftOpenApiVersion>
+    <MicrosoftOpenApiYamlReaderVersion>2.0.0-preview.29</MicrosoftOpenApiYamlReaderVersion>
     <!-- dotnet tool versions (see also auto-updated DotnetEfVersion property). -->
     <DotnetDumpVersion>6.0.322601</DotnetDumpVersion>
     <DotnetServeVersion>1.10.93</DotnetServeVersion>

src/OpenApi/gen/XmlCommentGenerator.Emitter.cs

@@ -58,9 +58,7 @@ namespace Microsoft.AspNetCore.OpenApi.Generated
     using Microsoft.AspNetCore.OpenApi;
     using Microsoft.AspNetCore.Mvc.Controllers;
     using Microsoft.Extensions.DependencyInjection;
-    using Microsoft.OpenApi.Models;
-    using Microsoft.OpenApi.Models.Interfaces;
-    using Microsoft.OpenApi.Models.References;
+    using Microsoft.OpenApi;
 
     {{GeneratedCodeAttribute}}
     file record XmlComment(

src/OpenApi/perf/Microbenchmarks/TransformersBenchmark.cs

@@ -5,8 +5,7 @@
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.OpenApi.Extensions;
-using Microsoft.OpenApi.Models;
+using Microsoft.OpenApi;
 
 namespace Microsoft.AspNetCore.OpenApi.Microbenchmarks;
 
@@ -102,7 +101,7 @@ public void SchemaTransformer_Setup()
         {
             _options.AddSchemaTransformer((schema, context, token) =>
             {
-                schema.Extensions ??= [];
+                schema.Extensions ??= new Dictionary<string, IOpenApiExtension>();
                 if (context.JsonTypeInfo.Type == typeof(Todo) && context.ParameterDescription != null)
                 {
                     schema.Extensions["x-my-extension"] = new JsonNodeExtension(context.ParameterDescription.Name);
@@ -176,7 +175,7 @@ private class SchemaTransformer : IOpenApiSchemaTransformer
     {
         public Task TransformAsync(OpenApiSchema schema, OpenApiSchemaTransformerContext context, CancellationToken cancellationToken)
         {
-            schema.Extensions ??= [];
+            schema.Extensions ??= new Dictionary<string, IOpenApiExtension>();
             if (context.JsonTypeInfo.Type == typeof(Todo) && context.ParameterDescription != null)
             {
                 schema.Extensions["x-my-extension"] = new JsonNodeExtension(context.ParameterDescription.Name);

src/OpenApi/sample/Program.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Text.Json.Serialization;
-using Microsoft.OpenApi.Models;
 using Sample.Transformers;
 
 var builder = WebApplication.CreateBuilder(args);

src/OpenApi/sample/Sample.csproj

@@ -39,4 +39,8 @@
     <ProjectReference Include="../gen/Microsoft.AspNetCore.OpenApi.SourceGenerators.csproj" OutputItemType="Analyzer" ReferenceOutputAssembly="false" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Using Include="Microsoft.OpenApi" />
+  </ItemGroup>
+
 </Project>

src/OpenApi/sample/Transformers/AddBearerSecuritySchemeTransformer.cs

@@ -3,8 +3,6 @@
 
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.OpenApi;
-using Microsoft.OpenApi.Models;
-using Microsoft.OpenApi.Models.Interfaces;
 
 namespace Sample.Transformers;
 

src/OpenApi/sample/Transformers/AddContactTransformer.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using Microsoft.AspNetCore.OpenApi;
-using Microsoft.OpenApi.Models;
 
 namespace Sample.Transformers;
 

src/OpenApi/sample/Transformers/AddExternalDocsTransformer.cs

@@ -2,7 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using Microsoft.AspNetCore.OpenApi;
-using Microsoft.OpenApi.Models;
 
 namespace Sample.Transformers;
 

src/OpenApi/sample/Transformers/OperationTransformers.cs

@@ -2,8 +2,6 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using Microsoft.AspNetCore.OpenApi;
-using Microsoft.OpenApi.Extensions;
-using Microsoft.OpenApi.Models;
 
 namespace Sample.Transformers;
 

src/OpenApi/src/Extensions/JsonNodeSchemaExtensions.cs

@@ -15,7 +15,6 @@
 using Microsoft.AspNetCore.Mvc.ModelBinding;
 using Microsoft.AspNetCore.Routing;
 using Microsoft.AspNetCore.Routing.Constraints;
-using Microsoft.OpenApi.Models;
 
 namespace Microsoft.AspNetCore.OpenApi;