自定义属性未命中 [英] Custom Attribute not being hit

问题描述

我创建了一个自定义属性，当它被击中时写入控制台，但它似乎没有被击中。这是微软教程（http://msdn.microsoft.com/en-us/library/sw480ze8.aspx），正在2010年，.net 4.我正在运行。我猜这必须是我做错了，但是我看不出是什么。谁能帮助？

I've created a custom attribute which writes to the console when it's hit, however it doesn't seem to be hit. It's the microsoft tutorial (http://msdn.microsoft.com/en-us/library/sw480ze8.aspx) and is being run on 2010, .net 4. I'm guessing it must be me that's doing something wrong, but I can't see what it is. Can anyone help?

这是属性，其代码从未被命中

This is the attribute, whose code is never being hit

[AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct)]
public class Author : Attribute
{
    private string _name;
    private double _version;

    public Author(string name)
    {
        Console.WriteLine(string.Format("author {0} was just created", name));

        _name = name;
        _version = 1.0;
    }
}

这是使用它的类 - 输出构造函数中的代码：

This is the class that uses it - it's successfully writing out the code in the constructor:

/// <summary>
/// TODO: Update summary.
/// </summary>
[Author("P. Ackerman")]
public class Ackerman
{
    public Ackerman()
    {
        Console.WriteLine("I created Ackerman.");
    }
}

这是调用它的控制台应用程序，成功打印出新的Ackerman（）构造函数中的代码：

And this is the console app that calls it and is successfully printing out the code in the new Ackerman() constructor:

    static void Main(string[] args)
    {
        Ackerman author1 = new Ackerman();
        Console.ReadLine();
    }

谢谢!!

推荐答案

类的实例的属性没有创建，那么你创建类的实例。只有这时你特别要求他们像这样：

Instances of attributes on class are not created then you create instance of class. Only then you specifically asks for them like this:

var attrib = author1.GetType().GetCustomAttributes(false);

此代码将触发您的 Console.WriteLine（string.Format {0}刚刚创建，name））;

这篇关于自定义属性未命中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！