初始提交

2026-08-26 18:06:02 +08:00
commit 5544788917
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+using System.Text.Json;
+using MAF1.Tools;
+using MAF1.Utils;
+using Microsoft.Agents.AI;
+using Microsoft.Extensions.AI;
+
+namespace MAF1.Agents.FileCity;
+
+public static class FileCityAgent
+{
+    public static AIAgent Create(AgentFactory factory)
+    {
+        return factory.CreateAgent(
+            name: "FileCityAgent",
+            instructions:
+            """
+            你负责读取用户指定的本地文件，并从中提取有效城市名。
+            必须先调用 ReadTextFile 读取文件，不要猜测文件内容。
+            有效城市名：现实世界中真实存在的城市（如 成都、北京、Amsterdam）。
+            忽略空行、注释、人名、水果、随意单词等不是城市的内容。
+            只输出一个 JSON 对象，不要 Markdown，不要其它说明：
+            {"hasValidCities": true, "cities": ["成都"], "reason": "说明"}
+            若没有有效城市：{"hasValidCities": false, "cities": [], "reason": "原因"}
+            cities 去重，保持文件中的出现顺序。
+            """,
+            tools: [AIFunctionFactory.Create(FileTools.ReadTextFile)]);
+    }
+
+    public static async Task<AgentStepResult> RunAsync(
+        AIAgent agent,
+        IReadOnlyDictionary<string, object?> inputs,
+        CancellationToken cancellationToken = default)
+    {
+        string filePath = AgentInputs.ReadString(inputs, "filePath") ?? "Data/cities.txt";
+        AgentResponse response = await agent.RunAsync(
+            $"请读取这个文件并提取有效城市名：{filePath}",
+            cancellationToken: cancellationToken);
+        CityExtraction extraction = Parse(response.Text);
+        return new AgentStepResult
+        {
+            Message = response.Text,
+            Inputs = new Dictionary<string, object?> { ["filePath"] = filePath },
+            Outputs = new Dictionary<string, object?>
+            {
+                ["hasValidCities"] = extraction.HasValidCities,
+                ["cities"] = extraction.Cities,
+                ["reason"] = extraction.Reason,
+                ["raw"] = response.Text,
+            },
+        };
+    }
+
+    public static CityExtraction Parse(string text)
+    {
+        try
+        {
+            CityExtraction? result = JsonSerializer.Deserialize<CityExtraction>(
+                JsonText.UnwrapObject(text),
+                new JsonSerializerOptions { PropertyNameCaseInsensitive = true });
+            if (result is null)
+            {
+                return Invalid("无法解析文件 Agent 的输出。");
+            }
+
+            result.Cities = result.Cities
+                .Where(city => !string.IsNullOrWhiteSpace(city))
+                .Select(city => city.Trim())
+                .Distinct(StringComparer.OrdinalIgnoreCase)
+                .ToList();
+            result.HasValidCities = result.HasValidCities && result.Cities.Count > 0;
+            return result;
+        }
+        catch (JsonException ex)
+        {
+            return Invalid($"文件 Agent 没有返回合法 JSON：{ex.Message}");
+        }
+    }
+
+    private static CityExtraction Invalid(string reason) =>
+        new() { HasValidCities = false, Reason = reason };
+}