更新

HttpClientStudy.Core/HttpClientStudy.Core.csproj

@@ -6,6 +6,10 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="System.Net.Http.Json" Version="8.0.0" />
+  </ItemGroup>
+
   <ItemGroup>
     <ProjectReference Include="..\HttpClientStudy.Model\HttpClientStudy.Model.csproj" />
   </ItemGroup>

HttpClientStudy.UnitTest/HttpClientTest.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http.Json;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace HttpClientStudy.UnitTest
+{
+    public class HttpClientTest
+    {
+        private readonly ITestOutputHelper _logger;
+        public HttpClientTest(ITestOutputHelper outputHelper) 
+        {
+            _logger = outputHelper;
+        }
+
+        /// <summary>
+        /// Get请求中使用请求体
+        /// 注意：服务器要设置(配置KestrelServerOptions AllowSynchronousIO值为true)
+        /// </summary>
+        /// <returns></returns>
+        [Fact]
+        public async Task GetWithBodyTestAsync()
+        { 
+            HttpClient httpClient = new HttpClient();
+
+
+            var formData = new List<KeyValuePair<string, string>>
+            {
+                new KeyValuePair<string, string>("param1", "value1"),
+                new KeyValuePair<string, string>("param2", "value2")
+            };
+
+            HttpRequestMessage requestMessage = new HttpRequestMessage(HttpMethod.Post,"http://localhost:5189/api/AdvancedGet/GetWithBody");
+
+            requestMessage.Content = new FormUrlEncodedContent(formData);
+            
+
+            var response = await httpClient.SendAsync(requestMessage);
+            response.EnsureSuccessStatusCode();
+
+        }
+    }
+}