c# - 继承属性

Question

属性代码

[AttributeUsage(AttributeTargets.Property, Inherited = true)]
class IgnoreAttribute : Attribute
{
}

基类

abstract class ManagementUnit
{
    [Ignore]
    public abstract byte UnitType { get; }
}

主类

class Region : ManagementUnit
{
    public override byte UnitType
    {
        get { return 0; }
    }

    private static void Main()
    {
        Type t = typeof(Region);
        foreach (PropertyInfo p in t.GetProperties())
        {
            if (p.GetCustomAttributes(typeof(IgnoreAttribute), true).Length != 0)
                Console.WriteLine("have attr");
            else
                Console.WriteLine("don't have attr");
        }
    }
}

输出: 没有属性

解释为什么会这样？毕竟，它必须继承。

Answer 1

The inherited flag dictates whether the attribute can be inherited. The default for this value is false. However, if the inherited flag is set to true, its meaning depends on the value of the AllowMultiple flag. If the inherited flag is set to true and the AllowMultiple flag is false, the attribute will override the inherited attribute. However, if the inherited flag is set to true and the AllowMultiple flag is also set to true, the attribute accumulates on the member.

来自 http://aclacl.brinkster.net/InsideC/32ch09f.htm查看指定继承属性规则一章

编辑:检查 Inheritance of Custom Attributes on Abstract Properties第一个答案:

It's the GetCustomAttributes() method that does not look at parent declarations. It only looks at attributes applied to the specified member.