Add upsert methods to EF. Not optimized implementation.

AsbCloudDb/EFExtentions.cs

@@ -49,6 +49,32 @@ namespace AsbCloudDb
             var factory = GetQueryStringFactory(dbSet);
             return factory.Columns;
         }
+
+        public static Microsoft.EntityFrameworkCore.ChangeTracking.EntityEntry<T> Upsert<T>(this DbSet<T> dbSet, T value)
+            where T : class
+        {
+            return dbSet.Contains(value)
+                ? dbSet.Update(value)
+                : dbSet.Add(value);            
+        }
+
+        public static (int updated, int inserted) UpsertRange<T>(this DbSet<T> dbSet, IEnumerable<T> values)
+            where T : class
+        {
+            (int updated, int inserted) stat = (0,0);
+            foreach (var value in values)
+                if (dbSet.Contains(value))
+                {
+                    stat.updated++;
+                    dbSet.Update(value);
+                }
+                else
+                {
+                    stat.inserted++;
+                    dbSet.Add(value);
+                }
+            return stat;
+        }
     }
 
     interface IQueryStringFactory { }