在上一篇的Function中，我们用混合方式来分别调用语义Function和本地Function，但调用顺序是开发者组织的。

其实SK是可以自组织的，下面定义了一个本地Function——GetChineseDay，用ImportPluginFromFunctions的方式添加到SK的插件库里。当在Call1中询问“现在离吃月饼还有多少天？”时，GetChineseDay就会被自动调用，但如果换一个问题：“1=1=？”，这个问题与日期没有关关系，则本地函数不会触发。注意这个配置var settings = new OpenAIPromptExecutionSettings() { ToolCallBehavior = ToolCallBehavior.AutoInvokeKernelFunctions };。

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.ChatCompletion;
using Microsoft.SemanticKernel.Connectors.OpenAI;
using System;
using System.Globalization;
using System.Text;

pragma warning disable SKEXP0001

var chatModelId = “gpt-4o”;
var key = File.ReadAllText(@”C:\GPT\key.txt”);

var builder = Kernel.CreateBuilder();
builder.AddOpenAIChatCompletion(chatModelId, key);
Kernel kernel = builder.Build();
kernel.ImportPluginFromFunctions(“HelperFunctions”,
[
kernel.CreateFunctionFromMethod(GetChineseDay, “GetChineseDay”, “返回中国的农历”)
]);
await Call1();

async Task Call1()
{
Console.WriteLine(“—————–Call1 开始———————“);
var settings = new OpenAIPromptExecutionSettings() { ToolCallBehavior = ToolCallBehavior.AutoInvokeKernelFunctions };
await foreach (var content in kernel.InvokePromptStreamingAsync(“现在离吃月饼还有多少天？”, new(settings)))
{
Console.Write(content);
}
Console.WriteLine();
Console.WriteLine(“—————–Call1 结束———————“);
}

string GetChineseDay()
{
var chineseCalendar = new ChineseLunisolarCalendar();
var today = DateTime.Now;
int lunarYear = chineseCalendar.GetYear(today);
int lunarMonth = chineseCalendar.GetMonth(today);
int lunarDay = chineseCalendar.GetDayOfMonth(today);
bool isLeapMonth = chineseCalendar.IsLeapMonth(lunarYear, lunarMonth);
Console.WriteLine(“——-GetChineseDay——–“);
return $”农历日期: {lunarYear}年 {(isLeapMonth ? “闰” : “”)}{lunarMonth}月 {lunarDay}日”;
}
Console.WriteLine();
运行结果如下：

如果想在聊天中用到Function Calling怎么做呢？
await Call2();

async Task Call2()
{
Console.WriteLine(“—————–Call2 开始———————“);
var settings = new OpenAIPromptExecutionSettings() { ToolCallBehavior = ToolCallBehavior.AutoInvokeKernelFunctions };
var chat = kernel.GetRequiredService();
var chatHistory = new ChatHistory(“中国农历的表示方式是：九月初三，十二月二十三，请用这种表示方式表示农历日期。”);
chatHistory.AddUserMessage(“现在离吃月饼还有多少天？”);
var contentBuilder = new StringBuilder();
await foreach (var streamingContent in chat.GetStreamingChatMessageContentsAsync(chatHistory, settings, kernel))
{
if (streamingContent.Content is not null)
{
Console.Write(streamingContent.Content);
contentBuilder.Append(streamingContent.Content);
}
}
chatHistory.AddAssistantMessage(contentBuilder.ToString());
Console.WriteLine();
Console.WriteLine(“—————–Call2 结束———————“);
}
运行结果如下：

下面是通过FunctionCallContentBuilder，来查看被调用的本地Function有哪些：

await Call3();

async Task Call3()
{
Console.WriteLine(“—————–Call4 开始———————“);
IChatCompletionService chat = kernel.GetRequiredService();
OpenAIPromptExecutionSettings settings = new() { ToolCallBehavior = ToolCallBehavior.EnableKernelFunctions };
ChatHistory chatHistory = new();
chatHistory.AddUserMessage(“中秋节吃月饼，现在离吃月饼还有多少天？”);
while (true)
{
AuthorRole? authorRole = null;
var fccBuilder = new FunctionCallContentBuilder();
await foreach (var streamingContent in chat.GetStreamingChatMessageContentsAsync(chatHistory, settings, kernel))
{
if (streamingContent.Content is not null)
{
Console.Write(streamingContent.Content);
}
authorRole ??= streamingContent.Role;
fccBuilder.Append(streamingContent);
}
Console.WriteLine();
var functionCalls = fccBuilder.Build();
if (!functionCalls.Any())
{
break;
}
var fcContent = new ChatMessageContent(role: authorRole ?? default, content: null);
chatHistory.Add(fcContent);

    foreach (var functionCall in functionCalls)
    {
        fcContent.Items.Add(functionCall);
        var functionResult = await functionCall.InvokeAsync(kernel);
        Console.WriteLine($"FunctionName：{functionResult.FunctionName}，Return：{functionResult.InnerContent}");
        chatHistory.Add(functionResult.ToChatMessage());
    }
    Console.WriteLine();
}
Console.WriteLine();
Console.WriteLine("-----------------Call4 结束---------------------");

}
运行结果：