c# - PropertyInfo 中的属性与 CustomAttributes

Question

我一直在使用 Reflections 并希望获取为属性声明的所有属性。 PropertInfo下有两个属性类是CustomAttributes和 Attributes .

根据MSDN , 解释如下:

属性:

This property represents the attributes associated with a member. All members have a set of attributes that are defined in relation to the specific type of member. The property attributes let the user know if this property is the default property, a SpecialName property, and so on.

注意: PropertyInfo.Attributes 中给出的代码示例页面甚至无法工作。

自定义属性:

An array that contains all the custom attributes applied to this member, or an array with zero elements if no attributes are defined.

但是，当我为他们运行此代码时，Attributes 不返回任何内容，而 CustomAttributes 返回 Required .

void Main()
{
    var attributes = typeof(Myproperty).GetProperty("Caption").CustomAttributes;
    //var attributes = typeof(Myproperty).GetProperty("Caption").Attributes;
    attributes.Dump(); //Dump is a LinqPad method which dumps everything to the outpu window
}

public class Myproperty
{
    private string caption = "Default caption";

    [Required]
    public string Caption
    {
        get{return caption;}
        set {if(caption!=value) {caption = value;}
        }
    }
}

Answer 1

PropertyInfo.Attributes 与 Attribute 类没有任何关系。检查PropertyAttributes enumeration对于您可能遇到的值。这些是与 C# 代码没有明显联系的 CLR 实现细节。是的，这是一个不幸的命名选择。

要查找类似于 [Required] 属性的属性，您必须使用 CustomAttributes 属性。