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Program.cs
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Program.cs
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using Dapper;
using System.Runtime.CompilerServices;
using System.Text.Json.Serialization;
using Npgsql;
[module:DapperAot]
Console.WriteLine(RuntimeFeature.IsDynamicCodeSupported ? "Running with JIT" : "Running with AOT");
var builder = WebApplication.CreateBuilder(args);
builder.Services
.AddSingleton<SqlConnectionFactory>(s =>
{
var config = s.GetRequiredService<IConfiguration>();
var connectionString = config.GetConnectionString("SqlConnectionString");
return () => new NpgsqlConnection(connectionString);
});
builder.Services.ConfigureHttpJsonOptions(options =>
{
options.SerializerOptions.TypeInfoResolverChain.Clear();
// Wire up the JSON source generator and make sure we remove the reflection fallback.
// this is a good way to verify that the source generator is working as expected.
options.SerializerOptions.TypeInfoResolverChain.Add(SomeThingJsonContext.Default);
});
builder.Services.AddSingleton(new Stack(builder.Configuration.GetValue<string>("Stack") ?? "csharp"));
var app = builder.Build();
// Dapper.AOT, at least at the moment (it was released like 4 days ago), doesn't seem to be able to handle things if we don't put it in a class
// app.MapGet("/", async (HttpContext context, SqlConnectionFactory sqlConnectionFactory, Stack stack) =>
// {
// await using var connection = sqlConnectionFactory();
// var item = await connection.QuerySingleAsync<SomeThing>("SELECT SomeId, SomeText FROM SomeThing LIMIT 1");
// context.Response.Headers["stack"] = stack.Name;
// return Results.Ok(item);
// });
app.MapGet("/", Handlers.Root);
app.Run();
public static class Handlers
{
public static async Task<IResult> Root(HttpContext context, SqlConnectionFactory sqlConnectionFactory, Stack stack)
{
await using var connection = sqlConnectionFactory();
var item = await connection.QuerySingleAsync<SomeThing>("SELECT SomeId, SomeText FROM SomeThing LIMIT 1");
context.Response.Headers["stack"] = stack.Name;
return Results.Ok(item);
}
}
public delegate NpgsqlConnection SqlConnectionFactory();
public record SomeThing(int SomeId, string SomeText);
public record Stack(string Name);
[JsonSerializable(typeof(SomeThing))]
[JsonSourceGenerationOptions(PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
public partial class SomeThingJsonContext : JsonSerializerContext
{
}