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Controllers/AIController.cs

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+using Google.GenAI.Types;
+using Microsoft.AspNetCore.Mvc;
+using System.Net.Http;
+using System.Text;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace NTestAIApi.Controllers {
+    [Route("api/[controller]")]
+    [ApiController]
+    public class AIController : ControllerBase {
+        private readonly IHttpClientFactory _httpClientFactory;
+        private readonly IConfiguration _configuration;
+
+        public AIController(IHttpClientFactory httpClientFactory, IConfiguration configuration) {
+            _httpClientFactory = httpClientFactory;
+            _configuration = configuration;
+        }
+
+        [HttpGet(Name = "GetAI")]
+        public async Task<IActionResult> Get([FromQuery] string question, [FromQuery] string? answer, [FromQuery] int? id) {
+            var apiKey = _configuration["Gemini:ApiKey"];
+            if (string.IsNullOrWhiteSpace(apiKey)) {
+                return StatusCode(500, "Gemini API 키가 설정되지 않았습니다.");
+            }
+
+            var url = "https://generativelanguage.googleapis.com/v1beta/models/gemini-flash-latest:generateContent";
+            var prompt = $"문제: {question}\n정답: {answer}\n이 문제와 정답이 맞는지 간단히 설명해줘.";
+
+            var requestBody = new GeminiRequest {
+                Contents = new List<Content>
+                {
+                    new Content
+                    {
+                        Parts = new List<Part>
+                        {
+                            new Part
+                            {
+                                Text = prompt
+                            }
+                        }
+                    }
+                }
+            };
+
+            var client = _httpClientFactory.CreateClient();
+
+            using var requestMessage = new HttpRequestMessage(HttpMethod.Post, url);
+            requestMessage.Headers.Add("X-goog-api-key", apiKey);
+            requestMessage.Content = new StringContent(JsonSerializer.Serialize(requestBody), Encoding.UTF8, "application/json");
+
+            var response = await client.SendAsync(requestMessage);
+            var responseText = await response.Content.ReadAsStringAsync();
+
+            if (!response.IsSuccessStatusCode) {
+                return StatusCode((int)response.StatusCode, responseText);
+            }
+
+            var geminiResponse = JsonSerializer.Deserialize<GeminiResponse>(responseText);
+
+            var resultText = geminiResponse?
+                .Candidates?
+                .FirstOrDefault()?
+                .Content?
+                .Parts?
+                .FirstOrDefault()?
+                .Text;
+
+            return Ok(new {
+                prompt,
+                result = resultText ?? "",
+                raw = geminiResponse
+            });
+        }
+    }
+
+    public class GeminiRequest {
+        [JsonPropertyName("contents")]
+        public List<Content> Contents { get; set; } = new();
+    }
+
+    public class Content {
+        [JsonPropertyName("parts")]
+        public List<Part> Parts { get; set; } = new();
+    }
+
+    public class Part {
+        [JsonPropertyName("text")]
+        public string Text { get; set; } = "";
+    }
+
+    public class GeminiResponse {
+        [JsonPropertyName("candidates")]
+        public List<Candidate>? Candidates { get; set; }
+    }
+
+    public class Candidate {
+        [JsonPropertyName("content")]
+        public CandidateContent? Content { get; set; }
+    }
+
+    public class CandidateContent {
+        [JsonPropertyName("parts")]
+        public List<Part>? Parts { get; set; }
+    }
+}

Controllers/WeatherForecastController.cs

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+using Microsoft.AspNetCore.Mvc;
+
+namespace NTestAIApi.Controllers {
+    [ApiController]
+    [Route("[controller]")]
+    public class WeatherForecastController : ControllerBase {
+        private static readonly string[] Summaries =
+        [
+            "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
+        ];
+
+        [HttpGet(Name = "GetWeatherForecast")]
+        public IEnumerable<WeatherForecast> Get() {
+            return Enumerable.Range(1, 5).Select(index => new WeatherForecast {
+                Date = DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
+                TemperatureC = Random.Shared.Next(-20, 55),
+                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
+            })
+            .ToArray();
+        }
+    }
+}

NTestAIApi.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Google.GenAI" Version="1.6.1" />
+    <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="10.0.5" />
+  </ItemGroup>
+
+</Project>

NTestAIApi.http

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+@NTestAIApi_HostAddress = http://localhost:5143
+
+GET {{NTestAIApi_HostAddress}}/weatherforecast/
+Accept: application/json
+
+###

Program.cs

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+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+
+builder.Services.AddControllers();
+// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
+builder.Services.AddOpenApi();
+builder.Services.AddHttpClient();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment()) {
+    app.MapOpenApi();
+}
+
+app.UseHttpsRedirection();
+
+app.UseAuthorization();
+
+app.MapControllers();
+
+app.Run();

Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "http": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "http://localhost:5143",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "https": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": false,
+      "applicationUrl": "https://localhost:7214;http://localhost:5143",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}

WeatherForecast.cs

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+namespace NTestAIApi {
+    public class WeatherForecast {
+        public DateOnly Date { get; set; }
+
+        public int TemperatureC { get; set; }
+
+        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
+
+        public string? Summary { get; set; }
+    }
+}

appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

appsettings.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*",
+  "Gemini": {
+    "ApiKey": "AIzaSyBWgJaS794XO4O38iYcNF6XFd85qb0Zy2Q"
+  }
+}