RequireAttributeUsagesAttribute

描述

仅允许在属性类型上使用。如果标记了属性类型，那么该类型的所有自定义属性也将被标记。

请注意，低和中级托管剥离级别不会删除任何自定义属性。

using System;
using UnityEngine;
using UnityEngine.Scripting;

public class NewBehaviourScript : MonoBehaviour
{
    void Start()
    {
        var f = new Foo();
        foreach (var attr in f.GetType().CustomAttributes)
        {
            if (attr.AttributeType == typeof(TypeUsedAttribute))
            {
                Debug.Log(attr.AttributeType);
            }
        }
    }
}

[TypeUsed] // Will survive because TypeUsedAttribute is used
[Required] // Will survive because RequiredAttribute has the attribute [RequireAttributeUsages]
[UnusedAndNotRequiredAttribute] // Is considered valid for managed code stripping to remove
class Foo
{
}


class TypeUsedAttribute : Attribute
{
}

[RequireAttributeUsages]
class RequiredAttribute : Attribute
{
}

class UnusedAndNotRequiredAttribute : Attribute
{
}