在这个程序中：
using System;
using System.Reflection;
using System.Security;

public class MyFilterAttributeSample
{
    public static void Main()
    {
        try
        {
            MemberFilter myFilter = Type.FilterAttribute;
            Type myType = typeof(System.String);
            MemberInfo[] myMemberInfoArray = myType.FindMembers(MemberTypes.Constructor
                |MemberTypes.Method, BindingFlags.Public | BindingFlags.Static |
                BindingFlags.Instance, myFilter, MethodAttributes.SpecialName);
            foreach (MemberInfo myMemberinfo in myMemberInfoArray)
            {
                Console.Write ("\n" + myMemberinfo.Name);
                Console.Write (" is a " + myMemberinfo.MemberType.ToString());
            }
        }
        catch(ArgumentNullException e)
        {
            Console.Write("ArgumentNullException : " + e.Message);
        }   
        catch(SecurityException e)
        {
            Console.Write("SecurityException : " + e.Message);
        }   
        catch(Exception e)
        {
            Console.Write("Exception :" + e.Message);
        }
    }   
}
请问：
1，MemberFilter myFilter = Type.FilterAttribute;中FilterAttribute是字段，myFilter 是委托实例 字段怎么能赋予委托实例呢？ msdn是这样解释的：此字段含有对 FindMembers 方法使用的委托的引用
2，MemberFilter myFilter = Type.FilterAttribute;
            Type myType = typeof(System.String);
            MemberInfo[] myMemberInfoArray = myType.FindMembers(MemberTypes.Constructor
                |MemberTypes.Method, BindingFlags.Public | BindingFlags.Static |
                BindingFlags.Instance, myFilter, MethodAttributes.SpecialName);
 能解释一下这段吗 越详细越好
 谢谢 急 急 急！！！