C#•5w ago

Dictionary<> Keys do not get fetched properly

    private readonly Dictionary<NamespacedKey, Texture2D> _textures = new();

    internal void Load() {
        var path = "assets/textures";
        var files = Directory.GetFiles(path);
        foreach (var file in files) {
            var texture = Raylib.LoadTexture(file);
            var id = NamespacedKey.texture(file.Replace("assets/textures\\", "").Replace(".png", ""));
            _textures.Add(id, texture);
            Console.WriteLine("Loaded texture with id " + id.Full + " Texture Format:" + texture.Format);
        }
    }

    internal void Unload() {
        foreach (var texture in _textures) {
            Raylib.UnloadTexture(texture.Value);
        }
    }

    private readonly Dictionary<NamespacedKey, Texture2D> _textures = new();

    internal void Load() {
        var path = "assets/textures";
        var files = Directory.GetFiles(path);
        foreach (var file in files) {
            var texture = Raylib.LoadTexture(file);
            var id = NamespacedKey.texture(file.Replace("assets/textures\\", "").Replace(".png", ""));
            _textures.Add(id, texture);
            Console.WriteLine("Loaded texture with id " + id.Full + " Texture Format:" + texture.Format);
        }
    }

    internal void Unload() {
        foreach (var texture in _textures) {
            Raylib.UnloadTexture(texture.Value);
        }
    }

NamespacedKey is just a class that stores 3 strings. I override the GetHashCode() method in it to

    public override int GetHashCode()
    {
        return Domain.GetHashCode() + Key.GetHashCode() + Family.GetHashCode();
    }

    public override int GetHashCode()
    {
        return Domain.GetHashCode() + Key.GetHashCode() + Family.GetHashCode();
    }

Ive tried different hashcodes incase im just stupid but nothing works

7 Replies

TofaaOP•5w ago

using the string of domain + key + family as the key in the dictionary works, but not my own class Okay apparently you need to override the equals function for some reason? I'd assume it just fetches the key from the hash code alone but it does an equals check aswell?

ero•5w ago

indeed it does: https://source.dot.net/#System.Private.CoreLib/src/libraries/System.Private.CoreLib/src/System/Collections/Generic/Dictionary.cs,428 you should pass an EqualityComparer instead of implementing GetHashCode and Equals and if you do implement GetHashCode, use HashCode.Combine

SleepWellPupper•4w ago

Implementing an EqualityComparer seems unnecessary to me in this case. Tip for OP: in VS you can generate GetHashCode and Equals implementations using the quick actions context menu when opened on the type name (put caret in type name, press ctrl+. then select generate Equals+GetHashCode)

ero•4w ago

how do you implementGetHashCode and Equals for byte[]?

SleepWellPupper•4w ago

Alternatively, if the identity of a NamespaceKey is fully determined by those 3 strings, you should look at records also.

ero•4w ago

wrong channel... sorry you're right

SleepWellPupper•4w ago

Records come with generated Equals/GetHashCode implementations that should fit your needs (from what I can tell frkm your examples)

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Dictionary<> Keys do not get fetched properly