Question

我正在Unity制作一个基于2D网格的游戏，并且有一个Weapon类，其中包含获取武器统计数据的属性。统计数据由武器组成的部分计算，部件的数量和类型由武器类型WepGun，WepStaff或WepSword定义。每种武器类型都具有亲和力和抓地力。为了让玩家为武器配备部件，我必须得到它的实际类型（枪/工作人员/剑），以便我可以使用武器上的区域。武器作为武器（可能是问题idk）存储在保存数据中，并使用Newtonsoft.Json json库保存到磁盘。

当我尝试分配Weapon的字段时没问题，但是当我尝试分配实际武器类型的字段时，我得到InvalidCastException: Cannot cast from source type to destination type.。 我很确定它不会向下倾斜，因为我创建了他们开始使用武器类型的角色。（this链接显示的示例与我的情况有些相似）

有问题的代码：

[SaveData.cs]

[JsonProperty] public static CharacterSaveData JESSIE = new CharacterSaveData(...,new StatManager.WepGun());

public class CharacterSaveData {
    ...

    [JsonProperty] public StatManager.Weapon weapon;

    internal CharacterSaveData (..., StatManager.Weapon weapon) {
        this.weapon = weapon;

        weapon.affinity = StatManager.Part.ART_AFFINITY;
        ((StatManager.WepGun)weapon).barrel = new StatManager.Part(StatManager.PartType.GUN_BARREL, StatManager.AttackType.CARDINAL_SINGLE_TARGET, 3, 0, 0.2f); //error occurs here
    }

[StatManager.cs]

public abstract class Weapon {
    [JsonProperty] private Part _affinity;
    public Part affinity {...}
    [JsonProperty] private Part _grip;
    public Part grip {...}

    ...properties

    internal Weapon (Part affinity, Part grip) {
        _affinity = affinity;
        _grip = grip;
    }
}
public class Part {
    ...predefined parts (ART_AFFINITY is here)

    public PartType? partType; //enum
    public AttackType? attackType; //enum
    public int? attackRange;
    public int? damageRange;
    public float? modifier;
    public ModType? modifierType; //enum

    public Part (PartType? partType = null, AttackType? attackType = null, int? attackRange = null, int? damageRange = null, float? modifier = null, ModType? modifierType = null) {
        this.partType = partType;
        this.attackType = attackType;
        this.attackRange = attackRange;
        this.damageRange = damageRange;
        this.modifier = modifier;
        this.modifierType = modifierType;
    }
}

public class WepGun : Weapon {
    [JsonProperty] private Part _barrel;
    public Part barrel {...}
    [JsonProperty] private Part _sight;
    public Part sight {...}
    [JsonProperty] private Part _bullet;
    public Part bullet {...}

    ...properties

    public WepGun (Part barrel = null, Part grip = null, Part sight = null, Part bullet = null, Part affinity = null) : base(affinity,grip) {
        _barrel = barrel;
        _sight = sight;
        _bullet = bullet;
    }
}
public class WepStaff : Weapon {
    [JsonProperty] private Part _shaft;
    public Part shaft {...}
    [JsonProperty] private Part _head;
    public Part head {...}
    [JsonProperty] private Part _accessory;
    public Part accessory {...}

    ...properties

    public WepStaff (Part shaft = null, Part grip = null, Part head = null, Part accessory = null, Part affinity = null) : base(affinity,grip) {
        _shaft = shaft;
        _head = head;
        _accessory = accessory;
    }
}
public class WepSword : Weapon {
    [JsonProperty] private Part _blade;
    public Part blade {...}
    [JsonProperty] private Part _guard;
    public Part guard {...}
    [JsonProperty] private Part _accessory;
    public Part accessory {...}

    ...properties

    public WepSword (Part blade = null, Part guard = null, Part grip = null, Part accessory = null, Part affinity = null) : base(affinity,grip) {
        _blade = blade;
        _guard = guard;
        _accessory = accessory;
    }
}

Answer 1

如果这是违规行，请更改并调试它。

((StatManager.WepGun)weapon).barrel = new StatManager.Part(StatManager.PartType.GUN_BARREL, StatManager.AttackType.CARDINAL_SINGLE_TARGET, 3, 0, 0.2f);

更改为

var wepGun = weapon as StatManager.WepGun;
if(null != wepGun)
    wepGun.barrel = new StatManager.Part(StatManager.PartType.GUN_BARREL, StatManager.AttackType.CARDINAL_SINGLE_TARGET, 3, 0, 0.2f); 
else
{
   // debug code
}

PS我认为你应该使用Interfaces而不是武器类型的类。总有一天你会想要将两种武器类型合并为一种。你不能用课程做到这一点。

获取派生类型

1 个答案: