C#-HttpClient简单使用

先贴两个可能用得到的链接

官方文档

https://docs.microsoft.com/zh-cn/dotnet/api/system.net.http.httpclient?view=net-6.0

HttpClient使用详解

https://blog.csdn.net/u010476739/article/details/119782562

创建

有三个构造函数

·HttpClient()

·HttpClient(HttpMessageHandler)

·HttpClient(HttpMessageHandler, Boolean)

常用方法

方法	用途
GetAsync(String)	向String(URL)发送GET请求(异步)
PostAsync(String, HttpContent)	向String(URL)发送POST请求，内容为HttpContext(异步)

以上皆返回Task<HttpResponseMessage>(服务器响应信息)

使用GET请求

var httpClient = new HttpClient();
var response = await httpClient.GetAsync("https://www.baidu.com");

if (response.IsSuccessStatusCode) // 当返回200时执行以下内容
{
    Console.WriteLine("Status: " + response.StatusCode); // 输出状态码
    Console.WriteLine("Head: " + response.Headers); // 输出返回的Header内容
    Console.WriteLine("Body: " + await response.Content.ReadAsStringAsync()); // 输出返回的内容
}

注意:可能需要引用System.Net.Http

使用POST请求

var httpClient = new HttpClient();
var result = await httpClient.PostAsync("{请求链接}", new StringContent(
        JsonConvert.SerializeObject(new { Name = "abc", id = 1 }),
        Encoding.UTF8,
        "application/json"));
// { Name = "abc", id = 1 }为请求参数
result.EnsureSuccessStatusCode(); // 状态码不为200就报错
Console.WriteLine(await result.Content.ReadAsStringAsync());

注意:可能需要引用System.Net.Http与Newtonsoft.Json