在SK中内置了一些服务，这些服务可以让我们的应用，简单的实例化调用，便拥有AI能力。
以OpenAI为例，SK中内置的OpenAI服务有：
内容生成服务：OpenAITextGenerationService
聊天服务：OpenAIChatCompletionService
文本转图片服务：OpenAITextToImageService
声音转文本服务：OpenAIAudioToTextService
文本转声音服务：OpenAITextToAudioService
文本嵌入向量服务：OpenAITextEmbeddingGenerationService
using Microsoft.Extensions.Logging;using Microsoft.SemanticKernel;using Microsoft.SemanticKernel.ChatCompletion;using Microsoft.SemanticKernel.Connectors.OpenAI;using System.Text.Json;var chatModelId = "gpt-3.5-turbo-instruct";var key = File.ReadAllText(@"C:\GPT\key.txt");var settings = new PromptExecutionSettings{ExtensionData = new Dictionary<string, object>{["max_tokens"] = 1000,["temperature"] = 0.2,["top_p"] = 0.8,["presence_penalty"] = 0.0,["frequency_penalty"] = 0.0}};Console.WriteLine("---------------非流式---------------");var textGenerationService = new OpenAITextGenerationService(chatModelId, key);var textContents = await textGenerationService.GetTextContentsAsync("用50个字描述一下.NET", settings);foreach (var textContent in textContents){var usage = textContent?.Metadata?["Usage"] as Azure.AI.OpenAI.CompletionsUsage;if (usage != null){var tokenStr = @$"====================Tokens==================提示词Tokens数：{usage.PromptTokens}返回内容Tokens数：{usage.CompletionTokens}总Tokens数：{usage.TotalTokens}===========================================";Console.WriteLine(tokenStr);}Console.WriteLine(textContent.Text);}Console.WriteLine("---------------流式---------------");var streamTextContents = textGenerationService.GetStreamingTextContentsAsync("用50个字描述一下C#");await foreach (var textContent in streamTextContents){Console.Write(textContent.Text);}
