C#•2y ago

❔ A property is changed even though it shouldn't?

This is driving me absolutely bonkers but something weird is going on.

  else
             {
                 GraphQLResponse<Data> filt = apiListData;

                 GraphQLResponse<Data> startFilter = filt;

                  foreach (var List in startFilter.Data.MediaListCollection.lists)
                    {
                        foreach (var listEntry in List.entries)
                        {
                            listEntry.CustomListsList = new ObservableCollection<customListItem>();
                            if (listEntry.CustomLists != null)
                            {
                                foreach (var VARIABLE in listEntry.CustomLists)
                                {
                                    listEntry.CustomListsList.Add(
                                        new customListItem
                                        {
                                            key = VARIABLE.Key,
                                            value = VARIABLE.Value
                                        }
                                    );
                                }
                            }
                        }
                    }

                    var filtered = startFilter.Data.MediaListCollection.lists;

                    foreach (var x in filtered)
                    {
                        x.entries = x.entries.Where(x => x.media.Title.UserPreferred.ToLowerInvariant().Contains(query))
                            .ToList();
                    }
                    Console.WriteLine(filtered);

  else
             {
                 GraphQLResponse<Data> filt = apiListData;

                 GraphQLResponse<Data> startFilter = filt;

                  foreach (var List in startFilter.Data.MediaListCollection.lists)
                    {
                        foreach (var listEntry in List.entries)
                        {
                            listEntry.CustomListsList = new ObservableCollection<customListItem>();
                            if (listEntry.CustomLists != null)
                            {
                                foreach (var VARIABLE in listEntry.CustomLists)
                                {
                                    listEntry.CustomListsList.Add(
                                        new customListItem
                                        {
                                            key = VARIABLE.Key,
                                            value = VARIABLE.Value
                                        }
                                    );
                                }
                            }
                        }
                    }

                    var filtered = startFilter.Data.MediaListCollection.lists;

                    foreach (var x in filtered)
                    {
                        x.entries = x.entries.Where(x => x.media.Title.UserPreferred.ToLowerInvariant().Contains(query))
                            .ToList();
                    }
                    Console.WriteLine(filtered);

I'm making a local variable at the beginning to which I assign data from apiListData. I'm making some changes on that local variables, especially that foreach (var x in filtered) which filters data. When I do debug point on that console.writeline apiListData from the beginning which was accessed only is affected even though it shouldn't. And don't mind second local variable, I was doing it only to avoid this weird situation kekw

Whole .cs - https://pastebin.com/4pezNHzB apiListData is just raw data that I'm assigning in Refresh task to keep it for filtering purposes.

Pastebin

using System.Collections.ObjectModel;using System.ComponentModel;us...

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25 Replies

Jimmacle•2y ago

classes are reference types, so filt and startFilter and apiListData all "point" to the same object

Ziomek64OP•2y ago

How do I "copy" it then so it isn't altered by the whole process

Jimmacle•2y ago

there is no standard way to do it

Ziomek64OP•2y ago

what do you suggest here

Jimmacle•2y ago

without knowing anything about the library you're using i'd look for any support for it in the library first are you sure you need to make a copy of it and you can't do whatever you're trying to do another way?

Ziomek64OP•2y ago

I want to keep apiListData untouched somehow

Unknown User•2y ago

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Ziomek64OP•2y ago

Are you just correcting code or fixing my problem?

Unknown User•2y ago

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Ziomek64OP•2y ago

And the setter is not accessed when that change happens, this is normal too?

Unknown User•2y ago

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Ziomek64OP•2y ago

Yes i was trying to say that that perhaps through that observable it changed

Unknown User•2y ago

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Ziomek64OP•2y ago

that observable is binded to collectionview but it one-way

Unknown User•2y ago

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Ziomek64OP•2y ago

yes

Unknown User•2y ago

Message Not Public

Ziomek64OP•2y ago

Where do I set break point then

Unknown User•2y ago

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MODiX•2y ago

tebeco#0205

- x.coll = new ObsCol()
+var tmp = new ObsCol()
seed()
+x.coll = tmp

- x.coll = new ObsCol()
+var tmp = new ObsCol()
seed()
+x.coll = tmp

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Unknown User•2y ago

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Ziomek64OP•2y ago

but where, I haven't ever used it that seed thing I'm going to sleep, cause I'm tired Will message tomorrow but you can reply

Unknown User•2y ago

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Ziomek64OP•2y ago

I don't have any add loop on lines 836-936 (when I get data from API) but I think I get your point, I'll try later when I get home Am i doing it wrong again?

                 GraphQLResponse<Data> filt = apiListData;

                 var tmp = new List<List>();
                 foreach (var list in apiListData.Data.MediaListCollection.lists)
                 {
                     tmp.Add(list);
                 }

                 foreach (var List in tmp)
                    {
                        foreach (var listEntry in List.entries)
                        {
                            listEntry.CustomListsList = new ObservableCollection<customListItem>();
                            if (listEntry.CustomLists != null)
                            {
                                foreach (var VARIABLE in listEntry.CustomLists)
                                {
                                    listEntry.CustomListsList.Add(
                                        new customListItem
                                        {
                                            key = VARIABLE.Key,
                                            value = VARIABLE.Value
                                        }
                                    );
                                }
                            }
                        }
                    }

                 var filtered = tmp;

                    foreach (var x in filtered)
                    {
                        x.entries = x.entries.Where(x => x.media.Title.UserPreferred.ToLowerInvariant().Contains(query.ToLowerInvariant()))
                            .ToList();
                    }
                    Console.WriteLine(filtered);

                 GraphQLResponse<Data> filt = apiListData;

                 var tmp = new List<List>();
                 foreach (var list in apiListData.Data.MediaListCollection.lists)
                 {
                     tmp.Add(list);
                 }

                 foreach (var List in tmp)
                    {
                        foreach (var listEntry in List.entries)
                        {
                            listEntry.CustomListsList = new ObservableCollection<customListItem>();
                            if (listEntry.CustomLists != null)
                            {
                                foreach (var VARIABLE in listEntry.CustomLists)
                                {
                                    listEntry.CustomListsList.Add(
                                        new customListItem
                                        {
                                            key = VARIABLE.Key,
                                            value = VARIABLE.Value
                                        }
                                    );
                                }
                            }
                        }
                    }

                 var filtered = tmp;

                    foreach (var x in filtered)
                    {
                        x.entries = x.entries.Where(x => x.media.Title.UserPreferred.ToLowerInvariant().Contains(query.ToLowerInvariant()))
                            .ToList();
                    }
                    Console.WriteLine(filtered);

I'm populating tmp with lists from apiListData on that last console.writeline apiListData is affected as before again which lines were you talking about What if i make apiListData serialized back to json and deserialize when needed? That should make "a copy". Idk how performant would that be with approx 500 items max, on mobile device

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ A property is changed even though it shouldn't?