Fix unittests and the AOT compatibility.

Author: nick863

sdk/ai/Azure.AI.Agents/src/Custom/Internal/AdditionalPropertyHelpers.cs

@@ -6,6 +6,7 @@
 using System;
 using System.ClientModel.Primitives;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
 
 #pragma warning disable OPENAI001
@@ -14,7 +15,7 @@ namespace Azure.AI.Agents;
 
 internal static partial class AdditionalPropertyHelpers
 {
-    internal static void SetAdditionalProperty<T, U>(this T instance, string key, U value)
+    internal static void SetAdditionalProperty<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.NonPublicProperties)]T, U>(this T instance, string key, U value)
         where T : IJsonModel<T>
     {
         PropertyInfo additionalDataProperty = instance.GetType().GetProperty("SerializedAdditionalRawData", BindingFlags.Instance | BindingFlags.NonPublic);
@@ -31,7 +32,7 @@ internal static void SetAdditionalProperty<T, U>(this T instance, string key, U
         additionalDataProperty.SetValue(instance, additionalData);
     }
 
-    internal static U GetAdditionalProperty<T, U>(this T instance, string key)
+    internal static U GetAdditionalProperty<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.NonPublicProperties)] T, U>(this T instance, string key)
     {
         PropertyInfo additionalDataProperty = instance.GetType().GetProperty("SerializedAdditionalRawData", BindingFlags.Instance | BindingFlags.NonPublic);
         object existingSerializedAdditionalRawData = additionalDataProperty.GetValue(instance);

sdk/ai/Azure.AI.Agents/src/Custom/Internal/PipelinePolicyHelpers.cs

@@ -199,9 +199,12 @@ public static void AddAzureFinetuningParityPolicy(OpenAIClientOptions options)
                                         "Content-Disposition: form-data; name=file; filename=([^;]*);.*") is Match fileContentDispositionMatch
                                     && fileContentDispositionMatch.Success)
                                 {
-                                    newRequestWriter.WriteLine("Content-Type: application/octet-stream");
+                                    // We are explicitly set the line ending as
+                                    // WriteLine will add only \n symbol on Unix systems,
+                                    // Which will result in error 400 on te service side.
+                                    newRequestWriter.Write("Content-Type: application/octet-stream\r\n");
                                 }
-                                newRequestWriter.WriteLine(line);
+                                newRequestWriter.Write($"{line}\r\n");
                                 previousLine = line;
                             }