.NET: Add FileAccessProvdider and concurrency fix for FileMemoryProvider (#5583)

* Add FileAccessProvdider and concurrency fix for FileMemoryProvider * Address PR comments
2026-06-16 21:04:09 +08:00 · 2026-04-30 15:04:56 +01:00
parent a9dafd53c3
commit 0295b4c4c7
20 changed files with 1228 additions and 23 deletions
@@ -0,0 +1,110 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+// This sample demonstrates how to use a ChatClientAgent with the FileAccessProvider
+// to give an agent access to a folder of CSV data files. The agent can read, analyze,
+// and extract information from the data, then write results back as new files.
+//
+// The sample includes a pre-populated `data/` folder with sales transaction data.
+// Ask the agent to analyze the data, produce summaries, or create new output files.
+//
+// Special commands:
+//   exit — End the session.
+
+#pragma warning disable OPENAI001 // Suppress experimental API warnings for Responses API usage.
+#pragma warning disable MAAI001  // Suppress experimental API warnings for Agents AI experiments.
+
+using System.ClientModel.Primitives;
+using Azure.Identity;
+using Harness.Shared.Console;
+using Microsoft.Agents.AI;
+using Microsoft.Agents.AI.Compaction;
+using Microsoft.Extensions.AI;
+using OpenAI;
+using OpenAI.Responses;
+
+var endpoint = Environment.GetEnvironmentVariable("AZURE_FOUNDRY_OPENAI_ENDPOINT") ?? throw new InvalidOperationException("AZURE_FOUNDRY_OPENAI_ENDPOINT is not set.");
+var deploymentName = Environment.GetEnvironmentVariable("AZURE_AI_MODEL_DEPLOYMENT_NAME") ?? "gpt-5.4";
+
+const int MaxContextWindowTokens = 1_050_000;
+const int MaxOutputTokens = 128_000;
+
+// Point the file store at the data/ folder that ships with the sample.
+var dataFolder = Path.Combine(AppContext.BaseDirectory, "data");
+var fileStore = new FileSystemAgentFileStore(dataFolder);
+
+var instructions =
+    """
+    You are a data analyst assistant. You have access to a folder of data files via the FileAccess_* tools.
+
+    ## Getting started
+    - Start by listing available files with FileAccess_ListFiles to see what data is available.
+    - Read the files to understand their structure and contents.
+
+    ## Working with data
+    - When asked to analyze data, read the relevant files first, then perform the analysis.
+    - Show your analysis clearly with tables, summaries, and key insights.
+    - When calculations are needed, work through them step by step and show your reasoning.
+
+    ## Writing output
+    - When asked to produce output files (e.g., reports, summaries, filtered data), use FileAccess_SaveFile to write them.
+    - Use appropriate file formats: CSV for tabular data, Markdown for reports.
+    - Confirm what you wrote and where.
+
+    ## Important
+    - Never modify or delete the original input data files unless explicitly asked to do so.
+    - If asked about data you haven't read yet, read it first before answering.
+    - Always explain your reasoning and thought process as you work through tasks.
+    - Always explain what you learned and what you are going to do next between tool calls, so the user can follow along with your thought process.
+    """;
+
+// Create a compaction strategy based on the model's context window.
+var compactionStrategy = new ContextWindowCompactionStrategy(
+    maxContextWindowTokens: MaxContextWindowTokens,
+    maxOutputTokens: MaxOutputTokens);
+
+AIAgent agent =
+    new OpenAIClient(
+        new BearerTokenPolicy(new DefaultAzureCredential(), "https://ai.azure.com/.default"),
+        new OpenAIClientOptions()
+        {
+            Endpoint = new Uri(endpoint),
+            RetryPolicy = new ClientRetryPolicy(3)
+        })
+    .GetResponsesClient()
+    .AsIChatClientWithStoredOutputDisabled(deploymentName)
+
+    .AsBuilder()
+    .UseFunctionInvocation()
+    .UsePerServiceCallChatHistoryPersistence()
+    .UseAIContextProviders(new CompactionProvider(compactionStrategy))
+
+    .BuildAIAgent(
+        new ChatClientAgentOptions
+        {
+            Name = "DataAnalyst",
+            Description = "A data analyst assistant that reads, analyzes, and processes data files.",
+            UseProvidedChatClientAsIs = true,
+            RequirePerServiceCallChatHistoryPersistence = true,
+            ChatHistoryProvider = new InMemoryChatHistoryProvider(
+                new InMemoryChatHistoryProviderOptions
+                {
+                    ChatReducer = compactionStrategy.AsChatReducer(),
+                }),
+            AIContextProviders =
+            [
+                new FileAccessProvider(fileStore),
+            ],
+            ChatOptions = new ChatOptions
+            {
+                Instructions = instructions,
+                MaxOutputTokens = MaxOutputTokens,
+            },
+        })
+    .AsBuilder()
+    .Build();
+
+// Run the interactive console session.
+await HarnessConsole.RunAgentAsync(
+    agent,
+    title: "Data Processing Assistant",
+    userPrompt: "Ask me to analyze the data files, produce summaries, or create output files.");