使用属性在事件上使用目标

发布于 2024-10-27 14:33:48 字数 341 浏览 1 评论 0原文

在事件（字段定义的事件）上使用属性时，存在三种可能的属性目标，即事件、字段和方法。我了解事件和字段目标的用法，但是方法目标适用于哪里。

例如

[AttributeUsage(AttributeTargets.All,AllowMultiple=false,Inherited=true)]
internal class TestAttribute : Attribute
{
}
internal class Test
{
    [event: Test]
    [field: Test]
    [method: Test]
    public event Action action;
}

原文

There are three possible attribute targets when using attributes on events (field defined events) and those are event, field and method. I understand the usage of event and field target, but where does the method target apply.

for example

[AttributeUsage(AttributeTargets.All,AllowMultiple=false,Inherited=true)]
internal class TestAttribute : Attribute
{
}
internal class Test
{
    [event: Test]
    [field: Test]
    [method: Test]
    public event Action action;
}

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神魇的王 2024-11-03 14:33:48

据我所知，它应用于编译器生成的“添加”和“删除”方法（执行订阅/取消订阅的方法）：

using System;
using System.Reflection;
using System.Runtime.CompilerServices;

[AttributeUsage(AttributeTargets.All,AllowMultiple=false,Inherited=true)]
internal class TestAttribute : Attribute
{
}
internal class Test
{
    [event: Test]
    [field: Test]
    [method: Test]
    public event Action action;

    static void Main() 
    {
        MethodInfo method = typeof(Test).GetEvent("action")
                                        .GetRemoveMethod(); // Or GetAddMethod
        Console.WriteLine(method.IsDefined(typeof(TestAttribute), true));
    }
}

As far as I can tell, it's applied to the "add" and "remove" methods generated by the compiler (the methods which perform the subscription/unsubscription):

using System;
using System.Reflection;
using System.Runtime.CompilerServices;

[AttributeUsage(AttributeTargets.All,AllowMultiple=false,Inherited=true)]
internal class TestAttribute : Attribute
{
}
internal class Test
{
    [event: Test]
    [field: Test]
    [method: Test]
    public event Action action;

    static void Main() 
    {
        MethodInfo method = typeof(Test).GetEvent("action")
                                        .GetRemoveMethod(); // Or GetAddMethod
        Console.WriteLine(method.IsDefined(typeof(TestAttribute), true));
    }
}

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