Additional fields Add, Update and Delete work (too well)

SelectableListView works when programmatically setting selection

ModernKeePass.Application/Entry/Commands/DeleteField/DeleteFieldCommand.cs

@@ -0,0 +1,29 @@
+using MediatR;
+using ModernKeePass.Application.Common.Interfaces;
+using ModernKeePass.Domain.Exceptions;
+
+namespace ModernKeePass.Application.Entry.Commands.DeleteField
+{
+    public class DeleteFieldCommand: IRequest
+    {
+        public string EntryId { get; set; }
+        public string FieldName { get; set; }
+
+        public class DeleteFieldCommandHandler : IRequestHandler<DeleteFieldCommand>
+        {
+            private readonly IDatabaseProxy _database;
+
+            public DeleteFieldCommandHandler(IDatabaseProxy database)
+            {
+                _database = database;
+            }
+
+            public void Handle(DeleteFieldCommand message)
+            {
+                if (!_database.IsOpen) throw new DatabaseClosedException();
+
+                _database.DeleteField(message.EntryId, message.FieldName);
+            }
+        }
+    }
+}