Question

我正在尝试检索某种类型的属性。例如在Player类中：

public Player(string name, Stat endurance, Stat sprint, Stat dribble, Stat passing, Stat shooting)
{
   //Some code
}

public Stat Endurance { get; private set; }
public Stat Sprint { get; private set; }
public Stat Dribble { get; private set; }
public Stat Passing { get; set; }
public Stat Shooting { get; private set; }

public double OverallSkillLevel { get; private set; }    {

public string Name { get; private set; }    

public void CalculateAverage()
{        
    double sumOfStat = this.Endurance.Level + this.Sprint.Level + 
                       this.Dribble.Level + this.Shooting.Level + 
                       this.Passing.Level;
    //MethodOne:
    Type type =    this.GetType();
    int countOne = type .GetProperties().Count(x => x.MemberType is Stat);

    //MethodTwo
    double countTwo = this.GetType().GetFields().Count(x => x is Stat);

    //this.OverallSkillLevel = Math.Round((sumOfStat /  ), 0);
}

我希望变量“ countOne”或“ countTwo”仅将Stat属性返回给我。但我总是得到0

Answer 1

您正在检查PropertyInfo对象的错误属性；关于msdn的MemberInfo.MemberType属性：

在派生类中重写时，获取一个MemberTypes值，该值指示成员的类型-方法，构造函数，事件等。

您应该检查PropertyInfo.PropertyType属性。同样，在这种情况下，使用is关键字进行的检查在比较Type实例时使用Type.IsAssignableFrom()或==是错误的。

这应该可以解决问题：

//MethodOne:
int countOne = this.GetType().GetProperties().Count(x => x.PropertyType == typeof(Stat));

计算特定类别的属性？

1 个答案: