How to Efficiently Consume REST APIs in C# Using HttpClient?

Use httpclient in C#to access the REST API

This article will explore how to use C#for REST API calls. We will demonstrate this process by implementing an example code that interact with the remote REST API.

Abnormal treatment problem

The code you provided caused abnormalities because the response was not processed correctly. To solve this problem, you can use the TRY-CATCH block to deal with abnormalities and print the corresponding error messages to the console.

<code class="language-csharp">        private static void CreateObject()
        {
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
                request.Method = "POST";
                // ...

                WebResponse webResponse = request.GetResponse();
                // ...
                Console.WriteLine("对象创建成功。");
            }
            catch (Exception e)
            {
                Console.WriteLine("-----------------");
                Console.WriteLine(e.Message);
            }
        }</code>

Use ASP.NET Web API client library

ASP.NET Web API has replaced the WCF Web API mentioned earlier. Microsoft recommends using Microsoft ASP.NET Web API client library to use RESTFUL services. This method can improve performance and simplify use.

The following example how to use the ASP.NET Web API client library:

<code class="language-csharp">using System;
using System.Net.Http;
using System.Net.Http.Headers;

public static class Class1
{
    private const string URL = "https://sub.domain.com/objects.json";
    private static string urlParameters = "?api_key=123";

    public static void Main(string[] args)
    {
        // 创建HttpClient实例
        using (HttpClient client = new HttpClient())
        {
            // 设置API的基本地址
            client.BaseAddress = new Uri(URL);

            // 为JSON格式添加Accept标头
            client.DefaultRequestHeaders.Accept.Add(
                new MediaTypeWithQualityHeaderValue("application/json"));

            // 发出GET请求
            HttpResponseMessage response = client.GetAsync(urlParameters).Result;

            // 处理响应
            if (response.IsSuccessStatusCode)
            {
                // 解析响应正文并执行任何必要的操作
            }
            else
            {
                // 处理错误
            }
        }
    }
}</code>

This method allows REST API to interact simpler and more efficiently in the C#application.

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