使用扩展方法访问方法的属性

Question

下面我有一个解决方案,用扩展方法从字段中获取属性.现在我想用方法而不是字段做类似的事情.

public static MemberInfo GetMember<T, R>(this T instance, Expression<Func<T, R>> selector)
{
    var member = selector.Body as MemberExpression;
    return member?.Member;
}

public static T GetAttribute<T>(this MemberInfo meminfo) where T : Attribute
{
    return meminfo.GetCustomAttributes(typeof(T)).FirstOrDefault() as T;
}

用法:

var attr = this.GetMember(x => x.AddButtonVisibility).GetAttribute<Test>(); 

所以在我的情况下,用法应该是这样的:

var attr = this.GetMethod(x => x.SomeMethod).GetAttribute<Test>();

这有可能以任何方式或我必须尝试完全不同的东西吗？

Answer 1

您可以执行以下操作:

 public static MethodInfo GetMethod<T>(this T instance, Expression<Action<T>> selector)
 {
     var member = selector.Body as MethodCallExpression;
     return member?.Method;
 }

 public static MethodInfo GetMethod<T, R>(this T instance, Expression<Func<T, R>> selector)
 {
     var member = selector.Body as MethodCallExpression;
     return member?.Method;
 }

请注意,您需要以void不同方式处理方法,因为Func<T, R>没有意义,您需要重载Action<T>.