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.NET: Add helpers to more easily access in-memory ChatHistory and make ChatHistoryProvider management more configurable. (#4224)

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* Add helpers to more easily access in-memory ChatHistory and make ChatHistoryProvider management more configurable.

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
westey
2026-02-26 14:16:21 +00:00
committed by GitHub
co-authored by Copilot
parent c9cd067be6
commit 822a3eb5ea
8 changed files with 510 additions and 29 deletions
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dotnet/samples/02-agents/Agents/Agent_Step13_ChatReduction/Program.cs
+16 -10
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@@ -10,7 +10,6 @@ using Azure.Identity;
using Microsoft.Agents.AI;
using Microsoft.Extensions.AI;
using OpenAI.Chat;
using ChatMessage = Microsoft.Extensions.AI.ChatMessage;
var endpoint = Environment.GetEnvironmentVariable("AZURE_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_OPENAI_ENDPOINT is not set.");
var deploymentName = Environment.GetEnvironmentVariable("AZURE_OPENAI_DEPLOYMENT_NAME") ?? "gpt-4o-mini";
@@ -39,9 +38,10 @@ Console.WriteLine(await agent.RunAsync("Tell me a joke about a pirate.", session
// We can use the ChatHistoryProvider, that is also used by the agent, to read the
// chat history from the session state, and see how the reducer is affecting the stored messages.
// Here we expect to see 2 messages, the original user message and the agent response message.
var provider = agent.GetService<InMemoryChatHistoryProvider>();
List<ChatMessage>? chatHistory = provider?.GetMessages(session);
Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");
if (session.TryGetInMemoryChatHistory(out var chatHistory))
{
Console.WriteLine($"\nChat history has {chatHistory.Count} messages.\n");
}
// Invoke the agent a few more times.
Console.WriteLine(await agent.RunAsync("Tell me a joke about a robot.", session));
@@ -51,16 +51,22 @@ Console.WriteLine(await agent.RunAsync("Tell me a joke about a robot.", session)
// to trigger the reducer is just before messages are contributed to a new agent run.
// So at this time, we have not yet triggered the reducer for the most recently added messages,
// and they are still in the chat history.
chatHistory = provider?.GetMessages(session);
Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");
if (session.TryGetInMemoryChatHistory(out chatHistory))
{
Console.WriteLine($"\nChat history has {chatHistory.Count} messages.\n");
}
Console.WriteLine(await agent.RunAsync("Tell me a joke about a lemur.", session));
chatHistory = provider?.GetMessages(session);
Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");
if (session.TryGetInMemoryChatHistory(out chatHistory))
{
Console.WriteLine($"\nChat history has {chatHistory.Count} messages.\n");
}
// At this point, the chat history has exceeded the limit and the original message will not exist anymore,
// so asking a follow up question about it may not work as expected.
Console.WriteLine(await agent.RunAsync("What was the first joke I asked you to tell again?", session));
chatHistory = provider?.GetMessages(session);
Console.WriteLine($"\nChat history has {chatHistory?.Count} messages.\n");
if (session.TryGetInMemoryChatHistory(out chatHistory))
{
Console.WriteLine($"\nChat history has {chatHistory.Count} messages.\n");
}