.NET Core 中的 System.Attribute.GetCustomAttribute [英] System.Attribute.GetCustomAttribute in .NET Core

问题描述

我正在尝试将以下方法(在 .NET Framework 4.6.2 中工作正常)转换为 .NET Core 1.1.

I'm trying to convert the following method (which works fine in .NET Framework 4.6.2) to .NET Core 1.1.

public static TAttribute GetCustomAttribute<TAttribute>(MemberInfo member) where TAttribute : Attribute
{
    var attr = System.Attribute.GetCustomAttribute(member, typeof(TAttribute));
    if (attr is TAttribute)
       return attr;
    else
       return null;
}

这段代码给了我错误

属性不包含 GetCustomAttribute 的定义.

Attribute does not contain a definition for GetCustomAttribute.

知道与此等效的 .NET Core 应该是什么吗?

Any idea what the .NET Core equivalent of this should be?

附言我尝试了以下操作，但似乎抛出了异常.不确定异常是什么，因为它只是一起停止了应用程序.我尝试将代码放在 try catch 块中，但它仍然停止运行，因此我无法捕获异常.

P.S. I tried the following but it seems to throw an exception. Not sure what the exception is because it just stops the app all together. I tried putting the code in a try catch block but still it just stops running so I couldn't capture the exception.

public static TAttribute GetCustomAttribute<TAttribute>(MemberInfo member) where TAttribute : Attribute
{
   var attr = GetCustomAttribute<TAttribute>(member);
   if (attr is TAttribute)
      return attr;
   else
      return null;
}

推荐答案

如果添加对 System.Reflection.Extensions 或 System.Reflection.TypeExtensions 的包引用，然后MemberInfo 得到了很多扩展方法，比如GetCustomAttribute()、GetCustomAttributes()、GetCustomAttributes() 等.您可以改用它们.扩展方法在 System.Reflection.CustomAttributeExtensions 中声明，所以你需要一个 using 指令:

If you add a package reference to System.Reflection.Extensions or System.Reflection.TypeExtensions, then MemberInfo gets a lot of extension methods like GetCustomAttribute<T>(), GetCustomAttributes<T>(), GetCustomAttributes(), etc. You use those instead. The extension methods are declared in System.Reflection.CustomAttributeExtensions, so you'll need a using directive of:

using System.Reflection;

在你的情况下，member.GetCustomAttribute() 应该做你需要的一切.

In your case, member.GetCustomAttribute<TAttribute>() should do everything you need.

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