Question

检查我是否有一个名为ResponseAttributes的customAttribute。我已经声明了一个接口和几个具体的类{ Question 1, Question2, Question3 }

[AttributeUsage(AttributeTargets.Property)]
public class ResponseAttribute : Attribute { }
public interface IQuestion { }

public class Question1 : IQuestion
{
    [Response]
    public string Response { get; set; }
    public Question1() { Response = "2+1"; }
}

public class Question2 : IQuestion
{
    [Response]
    public decimal Response { get; set; }
    public Question2() { Response = 5; }
}

public class Question3 : IQuestion
{
    [Response]
    public string Response { get; set; }
    public Question3() { Response = "2+1"; }
}

现在，我要做的是如何验证包含该属性的类是否等于另一个？

我的意思是：

        List<IQuestion> questions = new List<IQuestion>()
        {
            new Question1(), new Question2()
        };

        Question3 question3 = new Question3();

        foreach (var question in questions)
        {
            // how to verify this condition:
            // if (customAttribute from question3 is equals to customAttribute fromquestion)
            // of course the question3 is equals to 1
        }

尽可能地，它们是不同的类型，这就是我设置为ResponseAttribute的原因。

Answer 1

您可以尝试使用具有Resposnse属性的接口（类型对象）如果你不能，你可以使用一个类级属性告诉你“响应属性”，你可以使用该属性的反射

示例：


public class ResponseAttribute : Attribute { 
  public string PropertyName { get; set }
}

[ResponseAttribute ("CustomResponse")}
public class Question1 {
   public string CustomResponse;
}

via reflection
foreach(var question in questions) {
   var responseAttr = (ResponseAttribute) question.GetType().GetCustomAttributes(typeof(ResponseAttribute));

var questionResponse= question.GetType().GetProperty(responseAttr.PropertyName,question,null);
}

Answer 2

尝试覆盖equals方法：

    public override bool Equals(object obj)
    {
        if (obj is IQuestion)
            return this.Response == ((IQuestion)obj).Response;
        else
            return base.Equals(obj);
    }

希望这会有所帮助

如何确定类中的customAttribute是否等于另一个？

2 个答案: