From 9da28603c190cefbcd24e66ad7ae5f6a2e6b1759 Mon Sep 17 00:00:00 2001
From: Kevin Matsubara <kevin.matsubara@proton.me>
Date: Mon, 7 Apr 2025 19:03:52 +0200
Subject: [PATCH] Add example function to project entity data into a DTO.

---
 EntityFrameworkCore.Console/Program.cs | 28 +++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/EntityFrameworkCore.Console/Program.cs b/EntityFrameworkCore.Console/Program.cs
index 63590a4..7120de4 100644
--- a/EntityFrameworkCore.Console/Program.cs
+++ b/EntityFrameworkCore.Console/Program.cs
@@ -15,7 +15,24 @@ context.Database.EnsureCreated();
 // Rather than raise: "System.InvalidOperationException: Sequence contains no elements."
 // var firstCoach = await context.Coaches.FirstOrDefaultAsync();
 
-await FilterScoredHomeMatches();
+async Task ProjectionAndAnonymousDataTypes()
+{
+  var teams = await context.Teams
+    .Select(t => new TeamDetailsDTO
+    {
+      TeamId = t.Id,
+      TeamName = t.Name,
+      CoachName = t.Coach.Name,
+      TotalHomeGoals = t.HomeMatches.Sum(m => m.HomeTeamScore),
+      TotalAwayGoals = t.AwayMatches.Sum(m => m.AwayTeamScore)
+    })
+    .ToListAsync();
+
+  foreach (var team in teams)
+  {
+    Console.WriteLine($"{team.TeamName} - {team.CoachName} | H: {team.TotalHomeGoals} | A: {team.TotalAwayGoals}");
+  }
+}
 
 async Task FilterScoredHomeMatches()
 {
@@ -428,4 +445,13 @@ class TeamInfoDTO
 {
   public DateTime Created { get; set; }
   public string Name { get; set; }
+}
+
+class TeamDetailsDTO
+{
+  public int TeamId { get; set; }
+  public string TeamName { get; set; }
+  public string CoachName { get; set; }
+  public int TotalHomeGoals { get; set; }
+  public int TotalAwayGoals { get; set; }
 }
\ No newline at end of file