added functionality to import ships by excel sheet

src/RoleEditor/MainWindow.xaml.cs

@@ -672,9 +672,83 @@ namespace RoleEditor
             }
         }
 
-        private void buttonImportShipss_Click(object sender, RoutedEventArgs e)
+        private async void buttonImportShipss_Click(object sender, RoutedEventArgs e)
         {
+            OpenFileDialog ofd = new OpenFileDialog
+            {
+                Filter = "Excel Files|*.xls;*.xlsx"
+            };
+            if (ofd.ShowDialog() ?? false)
+            {
+                FileStream stream;
+                try
+                {
+                    stream = File.Open(ofd.FileName, FileMode.Open, FileAccess.Read);
+                }
+                catch (Exception ex)
+                {
+                    MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
+                    return;
+                }
 
+                using (var reader = ExcelReaderFactory.CreateReader(stream))
+                {
+                    List<Ship> importShipList = new();
+                    int bCounter = 0;
+                    int pCounter = 0;
+
+                    try
+                    {
+                        do
+                        {
+                            while (reader.Read())
+                            {
+                                if (reader.FieldCount < 4)
+                                {
+                                    throw new InvalidDataException("Sheet must have at least 4 Columns of data");
+                                }
+
+                                if (reader.IsDBNull(0) && reader.IsDBNull(1)) continue;
+                                string ship_name = "";
+                                if (!reader.IsDBNull(0)) ship_name = reader.GetString(0);
+                                if (ship_name.Equals("Name", StringComparison.OrdinalIgnoreCase)) continue;                                
+
+                                // find ship in existing list
+                                if (_ships.Any(predicate: x => (x.Name != null) && x.Name.Equals(ship_name, StringComparison.OrdinalIgnoreCase)))
+                                    continue;
+
+                                Ship s = new();
+                                s.Name = ship_name;
+
+                                if (!reader.IsDBNull(1))
+                                    s.IMO = (int) reader.GetDouble(1);
+                                if (!reader.IsDBNull(2))
+                                    s.Length = reader.GetDouble(2);
+                                if(!reader.IsDBNull(3))
+                                    s.Width = reader.GetDouble(3);
+
+                                await s.Save(_dbManager);
+                                _ships.Add(s);
+                                bCounter++;
+
+                            }
+                        } while (reader.NextResult());
+
+                        if ((pCounter > 0) || (bCounter > 0))
+                        {
+                            MessageBox.Show($"Imported {bCounter} berths and added {pCounter} participants while doing so");
+                        }
+
+                    }
+                    catch (Exception ex)
+                    {
+                        MessageBox.Show("Error reading Excel: " + ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
+                    }
+                }
+
+                stream.Close();
+
+            }
         }
 
         #endregion