C#中.NET Framework4.5 https GET 带Header参数

在C#中，如果你想要使用.NET Framework 4.5发送HTTPS GET请求并带Header参数，你可以使用HttpClient类。以下是一个示例：

using System;
using System.Net.Http;
using System.Net.Http.Headers;

namespace YourNamespace
{
    class Program
    {
        static void Main(string[] args)
        {
            // 创建HttpClient实例
            using (HttpClient client = new HttpClient())
            {
                // 设置请求的URL
                string url = "https://example.com/api/resource";

                // 定义Header
                var headers = new Dictionary<string, string>
                {
                    { "Content-Type", "application/json" },
                    { "Authorization", "Bearer your_token_here" } // 示例头，替换为你实际需要的值
                };

                // 使用UriBuilder构建完整的URL，如果包含查询字符串
                if (!string.IsNullOrEmpty(url.Contains("?")))
                {
                    url += UriQueryBuilder.EncodeQuery(headers);
                }

                // 创建请求消息
                HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, url);

                // 添加Header到请求中
                foreach (KeyValuePair<string, string> header in headers)
                {
                    request.Headers.Add(header.Key, header.Value);
                }

                try
                {
                    // 发送GET请求
                    HttpResponseMessage response = await client.SendAsync(request);

                    // 检查响应状态码
                    if (response.IsSuccessStatusCode)
                    {
                        Console.WriteLine(await response.Content.ReadAsStringAsync());
                    }
                    else
                    {
                        Console.WriteLine($"Error: {response.StatusCode}");
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"Error sending request: {ex.Message}");
                }
            }
        }

        // 将Header添加到URL的查询字符串中，用于处理复杂情况
        private static string UriQueryBuilderEncodeQuery(Dictionary<string, string> headers)
        {
            StringBuilder sb = new StringBuilder();
            bool first = true;
            foreach (KeyValuePair<string, string> header in headers)
            {
                if (first)
                    first = false;
                else
                    sb.Append("&");

                sb.AppendFormat("{0}={1}", Uri.EscapeDataString(header.Key), Uri.EscapeDataString(header.Value));
            }
            return sb.ToString();
        }
    }
}