Waffen Posts - Answer Overflow

Waffen

•Created by Waffen on 5/22/2023 in #help

❔ Deep clone variable

How to create a complete, isolated copy of a variable to prevent the copy from changing when changed parent variable. I have tried some variants: 1. The most easiest variant

var parent = new Class();
var clonedParent = parent;
// do some changes with parent
if (parent == clonedParent) <-- True

var parent = new Class();
var clonedParent = parent;
// do some changes with parent
if (parent == clonedParent) <-- True

2. Variant with ICloneable *logic still not changed

class Person : ICloneable
{
    public string Name { get; set; }
    public int Age { get; set; }

    public object Clone()
    {
        return new Person { Name = this.Name, Age = this.Age };
    }
}

class Person : ICloneable
{
    public string Name { get; set; }
    public int Age { get; set; }

    public object Clone()
    {
        return new Person { Name = this.Name, Age = this.Age };
    }
}

if (parent == clonedParent) <-- True Still True 3. A little bit harder variant with ICloneable

class myClass : ICloneable
{
    public string Name { get; set; }
    public int Age { get; set; }

    public object Clone()
    {
        return this.MemberwiseClone();
    }
}

class myClass : ICloneable
{
    public string Name { get; set; }
    public int Age { get; set; }

    public object Clone()
    {
        return this.MemberwiseClone();
    }
}

if (parent == clonedParent) <-- True Still True Do you know any other variants to clone and isolate harold

86 replies

CC#

•Created by Waffen on 3/28/2023 in #help

❔ Problem with Dictionary<ulong, Image> (Strange work of memory access)

Concept of my system: A system that draws a picture with stickers, each of the stickers can be moved, there can be an unlimited number of stickers. Code with explanations in comments:

private static Dictionary<ulong, Image> UserStickerProfiles = new();

public static async Task MoveSticker(Sticker sticker)
{
    var stickerImage = await ItemManager.GetProfileItemImageAsync(itemId); // take image of sticker from file

    UserStickerProfiles.TryGetValue(args.User.Id, out var image);
    if (image == null)
    {
        image = await ProfileMethods.DrawProfileExceptStickerAsync(args.User, itemId); // draw picture without this sticker
        UserStickerProfiles.Add(args.User.Id, image);
    }

    image.Mutate(x => x.DrawImage(stickerImage, new Point(sticker.PositionX, sticker.PositionY), 1f)); // draw this sticker with new coordinations

    // saving and sending
    var memoryStream = new MemoryStream();
    await image.SaveAsPngAsync(memoryStream);
    memoryStream.Seek(0, SeekOrigin.Begin);

    // send image to user with memortStream
}

private static Dictionary<ulong, Image> UserStickerProfiles = new();

public static async Task MoveSticker(Sticker sticker)
{
    var stickerImage = await ItemManager.GetProfileItemImageAsync(itemId); // take image of sticker from file

    UserStickerProfiles.TryGetValue(args.User.Id, out var image);
    if (image == null)
    {
        image = await ProfileMethods.DrawProfileExceptStickerAsync(args.User, itemId); // draw picture without this sticker
        UserStickerProfiles.Add(args.User.Id, image);
    }

    image.Mutate(x => x.DrawImage(stickerImage, new Point(sticker.PositionX, sticker.PositionY), 1f)); // draw this sticker with new coordinations

    // saving and sending
    var memoryStream = new MemoryStream();
    await image.SaveAsPngAsync(memoryStream);
    memoryStream.Seek(0, SeekOrigin.Begin);

    // send image to user with memortStream
}

Problem: Each time you use this function, a new picture should appear with ALL stickers and the sticker that we moved to a new location. However, it happens that the sticker is duplicated and there are several of them. The suggestion line image.Mutate(x => x.DrawImage(stickerImage, new Point(sticker.PositionX, sticker.PositionY), 1f)); updates the Dictionary directly, though it shouldn't be, presumably because C# has a memory bug here. I am using .NET 7.0

13 replies

CC#

•Created by Waffen on 9/2/2022 in #help

NullReferenceException on FirstorDefault()

85 replies

Gaming

Programming