.NET: Seal factory contexts and add non JSO deserialize overloads (#3066)

* Seal factory contexts and add non JSO deserialize overloads

* Apply suggestions from code review

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

Author: westey-m

dotnet/src/Microsoft.Agents.AI.Abstractions/AgentRunResponse.cs

@@ -291,6 +291,15 @@ public AgentRunResponseUpdate[] ToAgentRunResponseUpdates()
         return updates;
     }
 
+    /// <summary>
+    /// Deserializes the response text into the given type.
+    /// </summary>
+    /// <typeparam name="T">The output type to deserialize into.</typeparam>
+    /// <returns>The result as the requested type.</returns>
+    /// <exception cref="InvalidOperationException">The result is not parsable into the requested type.</exception>
+    public T Deserialize<T>() =>
+        this.Deserialize<T>(AgentAbstractionsJsonUtilities.DefaultOptions);
+
     /// <summary>
     /// Deserializes the response text into the given type using the specified serializer options.
     /// </summary>
@@ -311,6 +320,15 @@ public T Deserialize<T>(JsonSerializerOptions serializerOptions)
         };
     }
 
+    /// <summary>
+    /// Tries to deserialize response text into the given type.
+    /// </summary>
+    /// <typeparam name="T">The output type to deserialize into.</typeparam>
+    /// <param name="structuredOutput">The parsed structured output.</param>
+    /// <returns><see langword="true" /> if parsing was successful; otherwise, <see langword="false" />.</returns>
+    public bool TryDeserialize<T>([NotNullWhen(true)] out T? structuredOutput) =>
+        this.TryDeserialize(AgentAbstractionsJsonUtilities.DefaultOptions, out structuredOutput);
+
     /// <summary>
     /// Tries to deserialize response text into the given type using the specified serializer options.
     /// </summary>

dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgentOptions.cs

@@ -80,7 +80,7 @@ public ChatClientAgentOptions Clone()
     /// <summary>
     /// Context object passed to the <see cref="AIContextProviderFactory"/> to create a new instance of <see cref="AIContextProvider"/>.
     /// </summary>
-    public class AIContextProviderFactoryContext
+    public sealed class AIContextProviderFactoryContext
     {
         /// <summary>
         /// Gets or sets the serialized state of the <see cref="AIContextProvider"/>, if any.
@@ -97,7 +97,7 @@ public class AIContextProviderFactoryContext
     /// <summary>
     /// Context object passed to the <see cref="ChatMessageStoreFactory"/> to create a new instance of <see cref="ChatMessageStore"/>.
     /// </summary>
-    public class ChatMessageStoreFactoryContext
+    public sealed class ChatMessageStoreFactoryContext
     {
         /// <summary>
         /// Gets or sets the serialized state of the chat message store, if any.

dotnet/src/Microsoft.Agents.AI/ChatClient/ChatClientAgentRunResponse{T}.cs

@@ -40,7 +40,6 @@ public ChatClientAgentRunResponse(ChatResponse<T> response) : base(response)
     /// </summary>
     /// <remarks>
     /// If the response did not contain JSON, or if deserialization fails, this property will throw.
-    /// To avoid exceptions, use <see cref="AgentRunResponse.TryDeserialize{T}"/> instead.
     /// </remarks>
     public override T Result => this._response.Result;
 }

dotnet/tests/Microsoft.Agents.AI.Abstractions.UnitTests/AgentRunResponseTests.cs

@@ -214,13 +214,37 @@ public void ToAgentRunResponseUpdatesProducesUpdates()
         Assert.Equal(100, usageContent.Details.TotalTokenCount);
     }
 
+#if NETFRAMEWORK
+    /// <summary>
+    /// Since Json Serialization using reflection is disabled in .net core builds, and we are using a custom type here that wouldn't
+    /// be registered with the default source generated serializer, this test will only pass in .net framework builds where reflection-based
+    /// serialization is available.
+    /// </summary>
     [Fact]
     public void ParseAsStructuredOutputSuccess()
     {
         // Arrange.
         var expectedResult = new Animal { Id = 1, FullName = "Tigger", Species = Species.Tiger };
         var response = new AgentRunResponse(new ChatMessage(ChatRole.Assistant, JsonSerializer.Serialize(expectedResult, TestJsonSerializerContext.Default.Animal)));
 
+        // Act.
+        var animal = response.Deserialize<Animal>();
+
+        // Assert.
+        Assert.NotNull(animal);
+        Assert.Equal(expectedResult.Id, animal.Id);
+        Assert.Equal(expectedResult.FullName, animal.FullName);
+        Assert.Equal(expectedResult.Species, animal.Species);
+    }
+#endif
+
+    [Fact]
+    public void ParseAsStructuredOutputWithJSOSuccess()
+    {
+        // Arrange.
+        var expectedResult = new Animal { Id = 1, FullName = "Tigger", Species = Species.Tiger };
+        var response = new AgentRunResponse(new ChatMessage(ChatRole.Assistant, JsonSerializer.Serialize(expectedResult, TestJsonSerializerContext.Default.Animal)));
+
         // Act.
         var animal = response.Deserialize<Animal>(TestJsonSerializerContext.Default.Options);
 
@@ -262,13 +286,37 @@ public void ParseAsStructuredOutputFailsWithIncorrectTypedJson()
         Assert.Throws<JsonException>(() => response.Deserialize<Animal>(TestJsonSerializerContext.Default.Options));
     }
 
+#if NETFRAMEWORK
+    /// <summary>
+    /// Since Json Serialization using reflection is disabled in .net core builds, and we are using a custom type here that wouldn't
+    /// be registered with the default source generated serializer, this test will only pass in .net framework builds where reflection-based
+    /// serialization is available.
+    /// </summary>
     [Fact]
     public void TryParseAsStructuredOutputSuccess()
     {
         // Arrange.
         var expectedResult = new Animal { Id = 1, FullName = "Tigger", Species = Species.Tiger };
         var response = new AgentRunResponse(new ChatMessage(ChatRole.Assistant, JsonSerializer.Serialize(expectedResult, TestJsonSerializerContext.Default.Animal)));
 
+        // Act.
+        response.TryDeserialize(out Animal? animal);
+
+        // Assert.
+        Assert.NotNull(animal);
+        Assert.Equal(expectedResult.Id, animal.Id);
+        Assert.Equal(expectedResult.FullName, animal.FullName);
+        Assert.Equal(expectedResult.Species, animal.Species);
+    }
+#endif
+
+    [Fact]
+    public void TryParseAsStructuredOutputWithJSOSuccess()
+    {
+        // Arrange.
+        var expectedResult = new Animal { Id = 1, FullName = "Tigger", Species = Species.Tiger };
+        var response = new AgentRunResponse(new ChatMessage(ChatRole.Assistant, JsonSerializer.Serialize(expectedResult, TestJsonSerializerContext.Default.Animal)));
+
         // Act.
         response.TryDeserialize(TestJsonSerializerContext.Default.Options, out Animal? animal);