如何使用FastMember获取成员的属性数据 [英] How to get the Attribute data of a Member with FastMember

问题描述

使用 NuGet 的 FastMember 库，我能够找到用特定属性修饰的类型，使用以下代码:

using the FastMember library from NuGet, I am able to find all the members of a type that are decorated with a particular attribute, using this code:

var accessor = TypeAccessor.Create(typeof (MyData));
var decoratedMembers = accessor.GetMembers().Where(x=>x.IsDefined(typeof(MyDecorationAttribute));

这一切都很好，但我现在需要能够为 decoratedMembers MemberSet<中的每个成员获取 MyDecorationAttribute 的特定实例/code> 并且据我所知没有办法做到这一点.

That's all very well and good, but I need to now be able to get the specific instance of MyDecorationAttribute for each of the members in decoratedMembers MemberSet and as far as I can see there isn't a way to do that.

我错过了什么吗?也许我应该使用不同的库来获取每个成员的属性数据，或者在这种情况下使用股票反射.

Am I missing something? Perhaps there's a different library that I should be using to get the attribute data per member, or is stock Reflection the way to go in this case.

推荐答案

首先 - Marc，非常感谢您提供了一个很棒的库！

First and foremost - Marc, thank you very much for an AWESOME library!

其次，请原谅我马克，因为我快要犯罪了...

Second, please forgive me Marc, for I am about to sin...

我遇到了同样的问题 - 希望访问关于成员的 MemberInfo，但图书馆让我嗅探"它，但不能访问它.

I have had the same problem - a desire to access a MemberInfo about the member, but library lets me "sniff" it, but not to access it.

在 http://www.codeproject 的帮助下.com/Articles/80343/Accessing-private-members.aspx

public static class SillyMemberExtensions
{
    public static T GetPrivateField<T>(this object obj, string name)
    {
        BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
        Type type = obj.GetType();
        FieldInfo field = type.GetField(name, flags);
        return (T)field.GetValue(obj);
    }

    public static T GetPrivateProperty<T>(this object obj, string name)
    {
        BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
        Type type = obj.GetType();
        PropertyInfo field = type.GetProperty(name, flags);
        return (T)field.GetValue(obj, null);
    }

    public static MemberInfo GetMemberInfo(this FastMember.Member member)
    {
        return GetPrivateField<MemberInfo>(member, "member");
    }

    public static T GetMemberAttribute<T>(this FastMember.Member member) where T : Attribute
    {
        return GetPrivateField<MemberInfo>(member, "member").GetCustomAttribute<T>();
    }
}

用法:

if (m.IsDefined(typeof(MyCustomAttribute)))
{
    var attr = m.GetMemberAttribute<MyCustomAttribute>();
    if (attr.SomeCustomParameterInTheAttribute >= 10)
        return "More than 10";
}

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