Add project files.

Gready_Poang.DataLayer/DataClasses/ParticipantRepository.cs

@@ -0,0 +1,84 @@
+using Common.Library;
+using GreadyPoang.DataLayer.Database;
+using GreadyPoang.EntityLayer;
+using Microsoft.EntityFrameworkCore;
+
+namespace GreadyPoang.DataLayer;
+
+public class ParticipantRepository : IRepository<Participant>
+{
+    private readonly DataContext _dataContext;
+
+    public ParticipantRepository(DataContext dataContext)
+    {
+        _dataContext = dataContext;
+    }
+    public async Task<IEnumerable<Participant>> Get()
+    {
+        return await _dataContext.Participants.ToListAsync();
+    }
+    public async Task<Participant?> Get(int id)
+    {
+        // Fix: Use FindAsync with key value array, not a predicate
+        return await _dataContext.Participants.FindAsync(id);
+    }
+    public async Task<int> Save(Participant entity)
+    {
+        var res = -1;
+        if (string.IsNullOrEmpty(entity.FirstName)
+            || string.IsNullOrEmpty(entity.LastName))
+        {
+            return res; // Validation failed
+        }
+
+        if (entity.ParticipantId == 0)
+        {
+            _dataContext.Participants.Add(entity);
+            await _dataContext.SaveChangesAsync();
+            res = entity.ParticipantId;
+        }
+        else
+        {
+            _dataContext.Participants.Update(entity);
+            await _dataContext.SaveChangesAsync();
+            res = entity.ParticipantId;
+        }
+        return res;
+
+    }
+    public bool Delete(Participant entity)
+    {
+        var res = false;
+        try
+        {
+            _dataContext.Participants.Remove(entity);
+            _dataContext.SaveChanges();
+            res = true;
+        }
+        catch (Exception ex)
+        {
+            System.Diagnostics.Debug.WriteLine($"Error deleting participant: {ex.Message}");
+            res = false;
+        }
+        return res;
+    }
+
+    public async Task<bool> DeleteById(int Id)
+    {
+        var ok = false;
+        var delObject = await this.Get(Id);
+        if (delObject != null)
+        {
+
+            try
+            {
+                ok = this.Delete(delObject);
+            }
+            catch (Exception ex)
+            {
+                throw new Exception("Unsuccessful remove of Participant: " + ex.Message);
+            }
+        }
+        return ok;
+    }
+}