初始化

ConsoleApp1/ConsoleApp1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="RestSharp" Version="112.1.0" />
+  </ItemGroup>
+
+</Project>

ConsoleApp1/Program.cs

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+using RestSharp;
+using System;
+
+namespace ConsoleApp1
+{
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            string BaseUrl = "http://localhost:51445/";
+            string Url = "api/values/get_json";
+            var options = new RestClientOptions(BaseUrl);
+            var client = new RestClient(options);
+            var request = new RestRequest(Url);
+            request.AddQueryParameter("data", "{\"2222\":\"4444\"}");
+
+            var response= client.ExecuteGet(request);
+            var qqq= response.Content;
+
+            Console.WriteLine("Hello, World!");
+        }
+    }
+}