HttpClient in C#: Complete Guide

To send HTTP requests using the HttpClient class in C#, you need to follow these steps:

1. Instantiate a HttpClient.

HttpClient client = new HttpClient();

1. Provide the basic information needed for the request, such as the URL, request method, and request headers.

client.BaseAddress = new Uri("http://example.com/api/");
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

1. Send an HTTP request and receive a response.

HttpResponseMessage response = await client.GetAsync("endpoint");
string responseBody = await response.Content.ReadAsStringAsync();

1. Deal with the response.

if (response.IsSuccessStatusCode)
{
    // 处理成功的情况
}
else
{
    // 处理失败的情况
}

1. Finally, you need to release the HttpClient instance.

client.Dispose();

The above are the basic methods for sending HTTP requests using the HttpClient class, which can be further customized for specific requirements by adjusting parameters and handling errors.