FastEndpoints中使用App.Client.GETAsync测试查询字符串参数的问题

以下是几种实用的解决思路：

• 手动拼接查询字符串到URL
  直接将查询参数拼接在请求URL末尾，示例代码：

  var paramValue = "test";
  var url = $"/api/your-endpoint?paramName={paramValue}";
  var response = await App.Client.GetAsync(url);
  

  若参数值包含特殊字符，需用Uri.EscapeDataString()处理避免编码问题：

  var safeParamValue = Uri.EscapeDataString("test value with spaces");
  var url = $"/api/your-endpoint?paramName={safeParamValue}";
  

• 使用ASP.NET Core的QueryHelpers工具类
  借助Microsoft.AspNetCore.WebUtilities中的QueryHelpers类安全构建带查询参数的URL，无需手动处理编码：

  using Microsoft.AspNetCore.WebUtilities;
  
  var baseUrl = "/api/your-endpoint";
  var queryParams = new Dictionary<string, string?>
  {
      { "param1", "value1" },
      { "param2", "value2" }
  };
  var urlWithQuery = QueryHelpers.AddQueryString(baseUrl, queryParams);
  var response = await App.Client.GetAsync(urlWithQuery);
  

• 自定义GETAsync扩展方法
  封装一个支持查询参数的扩展方法，方便后续复用：

  using System.Collections.Generic;
  using System.Net.Http;
  using System.Threading.Tasks;
  using Microsoft.AspNetCore.WebUtilities;
  using System.Reflection;
  
  public static class HttpClientExtensions
  {
      public static Task<HttpResponseMessage> GetAsync(this HttpClient client, string requestUri, Dictionary<string, string?> queryParams)
      {
          var urlWithQuery = QueryHelpers.AddQueryString(requestUri, queryParams);
          return client.GetAsync(urlWithQuery);
      }
  
      // 支持匿名对象作为参数的重载
      public static Task<HttpResponseMessage> GetAsync(this HttpClient client, string requestUri, object queryParams)
      {
          var paramDict = queryParams.GetType()
              .GetProperties(BindingFlags.Instance | BindingFlags.Public)
              .ToDictionary(p => p.Name, p => p.GetValue(queryParams)?.ToString());
          var urlWithQuery = QueryHelpers.AddQueryString(requestUri, paramDict);
          return client.GetAsync(urlWithQuery);
      }
  }
  

  使用时直接传入参数对象或字典：

  // 用匿名对象
  var response = await App.Client.GetAsync("/api/your-endpoint", new { param1 = "value1", param2 = "value2" });
  
  // 用字典
  var paramsDict = new Dictionary<string, string?> { { "param1", "value1" } };
  var response = await App.Client.GetAsync("/api/your-endpoint", paramsDict);
  

内容的提问来源于stack exchange，提问作者Gholamreza Fathpour