Add dotnet activities for train interface.

enterprise/.gitignore

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+obj
+bin

enterprise/Activities/TrainActivities.cs

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+using System.Net.Http.Json;
+using Temporalio.Activities;
+using TrainSearchWorker.Models;
+
+namespace TrainSearchWorker.Activities;
+
+public class TrainActivities
+{
+    private readonly HttpClient _client;
+
+    public TrainActivities(IHttpClientFactory clientFactory)
+    {
+        _client = clientFactory.CreateClient("TrainApi");
+    }
+
+    [Activity]
+    public async Task<List<Journey>> SearchTrains(SearchTrainsRequest request)
+    {
+        var response = await _client.GetAsync(
+            $"api/search?from={Uri.EscapeDataString(request.From)}" +
+            $"&to={Uri.EscapeDataString(request.To)}" +
+            $"&outbound_time={Uri.EscapeDataString(request.OutboundTime)}" +
+            $"&return_time={Uri.EscapeDataString(request.ReturnTime)}");
+
+        response.EnsureSuccessStatusCode();
+
+        return await response.Content.ReadFromJsonAsync<List<Journey>>() 
+            ?? throw new InvalidOperationException("Received null response from API");
+    }
+
+    [Activity]
+    public async Task<List<Journey>> BookTrains(BookTrainsRequest request)
+    {
+        var response = await _client.PostAsJsonAsync("api/book", request);
+        response.EnsureSuccessStatusCode();
+
+        return await response.Content.ReadFromJsonAsync<List<Journey>>()
+            ?? throw new InvalidOperationException("Received null response from API");
+    }
+}

enterprise/Models/BookTrainRequest.cs

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+namespace TrainSearchWorker.Models;
+
+public record BookTrainsRequest
+{
+    public required string TrainIds { get; init; }
+}

enterprise/Models/Journey.cs

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+namespace TrainSearchWorker.Models;
+
+public record Journey
+{
+    public required string Id { get; init; }
+    public required string Type { get; init; }
+    public required string Departure { get; init; }
+    public required string Arrival { get; init; }
+    public required string DepartureTime { get; init; }
+    public required string ArrivalTime { get; init; }
+    public required decimal Price { get; init; }
+}

enterprise/Models/SearchTrainsRequest.cs

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+namespace TrainSearchWorker.Models;
+
+public record SearchTrainsRequest
+{
+    public required string From { get; init; }
+    public required string To { get; init; }
+    public required string OutboundTime { get; init; }
+    public required string ReturnTime { get; init; }
+}

enterprise/Program.cs

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+using Microsoft.Extensions.DependencyInjection;
+using Temporalio.Client;
+using Temporalio.Worker;
+using TrainSearchWorker.Activities;
+
+var services = new ServiceCollection();
+
+// Add HTTP client
+services.AddHttpClient("TrainApi", client =>
+{
+    client.BaseAddress = new Uri("http://localhost:8080/");
+    client.DefaultRequestHeaders.Add("Accept", "application/json");
+});
+
+// Add activities
+services.AddScoped<TrainActivities>();
+
+var serviceProvider = services.BuildServiceProvider();
+
+// Create client
+var client = await TemporalClient.ConnectAsync(new()
+{
+    TargetHost = "localhost:7233",
+});
+
+// Create worker options
+var options = new TemporalWorkerOptions("agent-task-queue-legacy");
+
+// Register activities
+var activities = serviceProvider.GetRequiredService<TrainActivities>();
+options.AddActivity(activities.SearchTrains);
+options.AddActivity(activities.BookTrains);
+
+// Create and run worker
+var worker = new TemporalWorker(client, options);
+
+Console.WriteLine("Starting worker...");
+using var tokenSource = new CancellationTokenSource();
+Console.CancelKeyPress += (_, eventArgs) =>
+{
+    eventArgs.Cancel = true;
+    tokenSource.Cancel();
+};
+
+try 
+{
+    await worker.ExecuteAsync(tokenSource.Token);
+}
+catch (OperationCanceledException)
+{
+    Console.WriteLine("Worker shutting down...");
+}

enterprise/TrainSearchWorker.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="Temporalio" Version="1.0.0" />
+    <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
+  </ItemGroup>
+</Project>