C# HttpRequestMessage是否支持GET

是的，C#中的HttpRequestMessage类支持GET请求。可以通过设置HttpRequestMessage对象的Method属性为HttpMethod.Get来发送GET请求。例如：

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

class Program
{
    static async Task Main(string[] args)
    {
        using (HttpClient client = new HttpClient())
        {
            HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, "https://api.example.com/data");
            HttpResponseMessage response = await client.SendAsync(request);

            if (response.IsSuccessStatusCode)
            {
                string responseBody = await response.Content.ReadAsStringAsync();
                Console.WriteLine(responseBody);
            }
            else
            {
                Console.WriteLine("Request failed with status code: " + response.StatusCode);
            }
        }
    }
}

在上面的示例中，我们创建了一个GET请求，指定了请求的URL为"https://api.example.com/data"。然后使用HttpClient发送该请求，并等待响应。如果响应成功，则将响应内容打印到控制台上。