查找项目中所有使用自定义属性的类

1. 自定义attribute

	[AttributeUsage(AttributeTargets.Method)] //标签适用范围
    public class MyAttribute : Attribute
    {
        public string Message { get; set; }

        public MyAttribute(string message)
        {
            Message = message;
        }
    }

2. 查找项目中所有使用了自定义标签的方法

public static IEnumerable GetMyAttributeMaked(List mappedKeys)
{
	//项目中使用的所有dll
	var assemblies = AppDomain.CurrentDomain.GetAssemblies(); 
	var neededAssemblies = new List();
    foreach(var key in mappedKeys)
    {
        var searchedAssemblies = assemblies.Where(a => a.FullName.Contains(key));
        if(searchedAssemblies != null && searchedAssemblies .Any())
        {
            neededAssemblies.AddRange(searchedAssemblies );
        }
     }
	foreach (var assembly in neededAssemblies )
    {
         var filtedAttributes = assembly.GetTypes().Where(type => type.IsClass)
         		.SelectMany(m => m.GetMethods()).SelectMany(m => m.GetCustomAttributes(typeof(MyAttribute), false))
                .Where(attribute => attribute is not null)
                .Select(notNullAttribute => notNullAttribute as MyAttribute)
                .ToList();
		 //do some work to customed attribute
    }
}