https://twitter.com/ravindUwU/status/1709533797161861311

1.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using System;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Threading.Tasks;

public partial class Program
{
	[Table("entity")]
	[PrimaryKey(nameof(Id))]
	class Entity
	{
		[Column("id")]
		public int Id { get; set; }

		[Column("col_1")]
		public string Col1 { get; set; } = default!;

		[Column("col_2")]
		public string Col2 { get; set; } = default!;
	}

	partial class Db : DbContext
	{
		public DbSet<Entity> Entities { get; set; } = default!;
	}

	public static async Task Main()
	{
		var db = new Db();

		Write("SELECT *");
		await db.Entities.ToListAsync();

		Write("Dictionary of (Id, Col1) with (await Select().ToListAsync()).ToDictionary()");
		(await db.Entities
			.Select((e) => new { e.Id, e.Col1 })
			.ToListAsync())
			.ToDictionary((e) => e.Id, (e) => e.Col1);

		Write("Dictionary of (Id, Col1) with ToDictionaryAsync()");
		await db.Entities
			.ToDictionaryAsync((e) => e.Id, (e) => e.Col1);
	}

	partial class Db
	{
		protected override void OnConfiguring(DbContextOptionsBuilder builder)
		{
			builder.UseSqlServer(_ConnectionString("localhost", "temp"));
			builder.LogTo(Console.WriteLine, LogLevel.Information);
		}
	}

	public static void Write(string m)
	{
		var oldForeground = Console.ForegroundColor;
		Console.ForegroundColor = ConsoleColor.Cyan;
		Console.WriteLine($"\n{m}");
		Console.ForegroundColor = oldForeground;
	}
}

output.txt

SELECT *
info: 4/10/2023 22:27:36.805 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
	Executed DbCommand (53ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
	SELECT [e].[id], [e].[col_1], [e].[col_2]
	FROM [entity] AS [e]

Dictionary of (Id, Col1) with (await Select().ToListAsync()).ToDictionary()
info: 4/10/2023 22:27:36.997 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
	Executed DbCommand (3ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
	SELECT [e].[id] AS [Id], [e].[col_1] AS [Col1]
	FROM [entity] AS [e]

Dictionary of (Id, Col1) with ToDictionaryAsync()
info: 4/10/2023 22:27:37.006 RelationalEventId.CommandExecuted[20101] (Microsoft.EntityFrameworkCore.Database.Command)
	Executed DbCommand (1ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
	SELECT [e].[id], [e].[col_1], [e].[col_2]
	FROM [entity] AS [e]