using System;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;

public abstract class JsonHttpClient
{
    // HttpClient實(shí)例，用于發(fā)送HTTP請(qǐng)求
    private readonly HttpClient _httpClient;

    // 構(gòu)造函數(shù)，初始化HttpClient
    protected JsonHttpClient()
    {
        _httpClient = new HttpClient();
    }

    // 發(fā)送HTTP請(qǐng)求的抽象方法，子類必須實(shí)現(xiàn)
    protected abstract Task<HttpResponseMessage> SendRequestAsync(HttpRequestMessage request);

    // 發(fā)送HTTP GET請(qǐng)求
    public async Task<string> GetAsync(string uri)
    {
        // 創(chuàng)建HTTP GET請(qǐng)求
        var request = new HttpRequestMessage(HttpMethod.Get, uri);

        // 發(fā)送請(qǐng)求并獲取響應(yīng)
        var response = await SendRequestAsync(request);

        // 確保響應(yīng)成功
        response.EnsureSuccessStatusCode();

        // 讀取響應(yīng)內(nèi)容并返回
        return await response.Content.ReadAsStringAsync();
    }

    // 發(fā)送HTTP POST請(qǐng)求
    public async Task<string> PostAsync(string uri, string jsonContent)
    {
        // 創(chuàng)建HTTP POST請(qǐng)求
        var request = new HttpRequestMessage(HttpMethod.Post, uri)
        {
            Content = new StringContent(jsonContent, Encoding.UTF8, "application/json")
        };

        // 發(fā)送請(qǐng)求并獲取響應(yīng)
        var response = await SendRequestAsync(request);

        // 確保響應(yīng)成功
        response.EnsureSuccessStatusCode();

        // 讀取響應(yīng)內(nèi)容并返回
        return await response.Content.ReadAsStringAsync();
    }

    // 發(fā)送HTTP PUT請(qǐng)求
    public async Task<string> PutAsync(string uri, string jsonContent)
    {
        // 創(chuàng)建HTTP PUT請(qǐng)求
        var request = new HttpRequestMessage(HttpMethod.Put, uri)
        {
            Content = new StringContent(jsonContent, Encoding.UTF8, "application/json")
        };

        // 發(fā)送請(qǐng)求并獲取響應(yīng)
        var response = await SendRequestAsync(request);

        // 確保響應(yīng)成功
        response.EnsureSuccessStatusCode();

        // 讀取響應(yīng)內(nèi)容并返回
        return await response.Content.ReadAsStringAsync();
    }

    // 發(fā)送HTTP DELETE請(qǐng)求
    public async Task<string> DeleteAsync(string uri)
    {
        // 創(chuàng)建HTTP DELETE請(qǐng)求
        var request = new HttpRequestMessage(HttpMethod.Delete, uri);

        // 發(fā)送請(qǐng)求并獲取響應(yīng)
        var response = await SendRequestAsync(request);

        // 確保響應(yīng)成功
        response.EnsureSuccessStatusCode();

        // 讀取響應(yīng)內(nèi)容并返回
        return await response.Content.ReadAsStringAsync();
    }
}

public class MyHttpClient : JsonHttpClient
{
    // 實(shí)現(xiàn)SendRequestAsync方法
    protected override async Task<HttpResponseMessage> SendRequestAsync(HttpRequestMessage request)
    {
        // 使用HttpClient發(fā)送請(qǐng)求并返回響應(yīng)
        return await _httpClient.SendAsync(request);
    }
}

using System;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        // 創(chuàng)建MyHttpClient實(shí)例
        var httpClient = new MyHttpClient();

        // 定義API的URL
        string apiUrl = "https://jsonplaceholder.typicode.com/posts";

        try
        {
            // 發(fā)送HTTP GET請(qǐng)求
            string response = await httpClient.GetAsync(apiUrl);

            // 將響應(yīng)內(nèi)容顯示在控制臺(tái)
            Console.WriteLine("Response from GET request:");
            Console.WriteLine(response);

            // 發(fā)送HTTP POST請(qǐng)求
            string postData = "{\"title\": \"foo\", \"body\": \"bar\", \"userId\": 1}";
            string postResponse = await httpClient.PostAsync(apiUrl, postData);

            // 將響應(yīng)內(nèi)容顯示在控制臺(tái)
            Console.WriteLine("Response from POST request:");
            Console.WriteLine(postResponse);
        }
        catch (HttpRequestException e)
        {
            // 處理HTTP請(qǐng)求異常
            Console.WriteLine("HTTP Request Error: " + e.Message);
        }
        catch (Exception e)
        {
            // 處理其他異常
            Console.WriteLine("Error: " + e.Message);
        }
    }
}