编辑：我能够通过这段代码得到我需要的东西，它提取了与我的类型相关的伙伴类列表 - t 是我的非伙伴类的类型。
MetadataTypeAttribute[] metaAttr = (MetadataTypeAttribute[])t.GetCustomAttributes(typeof(MetadataTypeAttribute), true);
问题也在代码中的评论中 -
我有一个自定义属性应用于好友类（我首先使用的是 EF-DB）。但是，当我尝试获取 memberinfo 时，我看不到自定义属性。如何使用如下表达式提取此属性的值？
using System;
using System.Linq;
using System.Reflection;
using System.Linq.Expressions;
using System.ComponentModel.DataAnnotations;
namespace ConsoleApplication1
{
// I have a custom attribute...
[System.AttributeUsage(System.AttributeTargets.Property)]
public class ExportNameAttribute : System.Attribute
{
public string DisplayName;
public ExportNameAttribute(string displayName)
{
DisplayName = displayName;
}
}
// And I have a class with a metadata buddy class (to simulate how I need to do this with EF-DB first)
[MetadataType(typeof(AttributeTestMetaData))]
public partial class AttributeTest
{
public string myAttribute { get; set; }
}
public class AttributeTestMetaData
{
[ExportName("test")]
public string myAttribute { get; set; }
}
// However, when I pull the member info for this property via an expression, I don't get the attribute back.
class Program
{
static void Main(string[] args)
{
var mInfo = GetMemberInfo((AttributeTest at) => at.myAttribute);
Console.WriteLine(mInfo.CustomAttributes.Count().ToString()); // Outputs 0
}
public static MemberInfo GetMemberInfo<T, U>(Expression<Func<T, U>> expression)
{
var member = expression.Body as MemberExpression;
if (member != null)
return member.Member;
throw new ArgumentException("Expression is not a member access", "expression");
}
}
}