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[英]C# Is it possible to use an instance of a base class for different instances of subclasses?
[英]Put different subclasses from the same base class into a list C#
我想添加不同的子类,这些子类从相同的基类扩展到List。
这是基类:
public class InteractionRequirement {
protected int requirementNumber;
public int RequirementNumber{
get{ return requirementNumber;}
set{ requirementNumber = value;}
}
}
这些是子类:
public class ObjectInteraction : InteractionRequirement {
protected string objectName;
--getter and setter here--
}
public class CharacterInteraction: InteractionRequirement {
protected string characterName;
--getter and setter here--
}
public class AssetInteraction: InteractionRequirement {
protected string assetName;
--getter and setter here--
}
我将它们添加到一个列表中:
List<InteractionRequirement> interactionRequirements = new List<InteractionRequirement>();
ObjectInteraction objectInteraction = new ObjectInteraction();
CharacterInteraction characterInteraction = new CharacterInteraction();
AssetInteraction assetInteraction = new AssetInteraction();
interactionRequirements.Add(objectInteraction);
interactionRequirements.Add(characterInteraction);
interactionRequirements.Add(assetInteraction);
但是我似乎无法从子类中检索属性值,这是一个错误。
string oName = interactionRequirement[0].ObjectName;
string cName = interactionRequirement[1].CharacterName;
string aName = interactionRequirement[2].AssetName;
这是因为interactionRequirements
集合的类型为InteractionRequirement
而不是派生类型(ObjectInteraction,CharacterIteraction或AssetInteraction)。
因此,您将需要强制转换。
string oName = ((ObjectInteraction)interactionRequirement[0]).ObjectName;
您还可以使用as
并检查强制转换是否成功。
var objectInteraction = interactionRequirement[0] as ObjectInteraction;
if (objectInteraction != null)
{
string oName = objectInteraction.ObjectName;
}
作为附加说明,您可能需要将ObjectName
的保护级别更改为public
以便可以在适当的上下文中(在类和派生类之外)访问它。
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