请问在C#中怎么取消事件是用什么语法，另外请推荐Attribute的一个教程

Question

this.button1.Click += new System.EventHandler(this.button1_Click_2);  //注册事件this.button1.Click-=new System.EventHandler(this.button1_Click_2);  //取消注册

Answer 1

this.button1.Click-=new System.EventHandler(this.button1_Click_2);  //取消注册

Answer 2

using System;
using System.IO;
using System.Reflection;class cAuthorAttribute:Attribute
{
public cAuthorAttribute(string name)
   {
m_name=name;
   }
public string Name
{
get
{
return m_name;
}
set
{
m_name=value;
}
} public string Note
{
get
{
return m_note;
}
set
{
m_note=value;
}
}
protected string m_name;
protected string m_note;

}[cAuthor("Xiongqin")]
class cMyClass
{
public cMyClass()
{ } [cAuthor("Xiongqin")]
public string Str()
{
return null;
} public int m_i; [cAuthor("Xiongqin")]
public float m_f;}class cAttributeTest
{
public cAttributeTest(Type theType)
{
m_type=theType;
}
public string GetAuthorName()
{
foreach(Attribute attrib in m_type.GetCustomAttributes(true))
{
cAuthorAttribute author_attrib=attrib as cAuthorAttribute;
if(author_attrib!=null)
return author_attrib.Name;
}
return null;
} public string GetNotes()
{
foreach(Attribute attrib in m_type.GetCustomAttributes(true))
{
cAuthorAttribute author_attrib=attrib as cAuthorAttribute;
if(author_attrib!=null)
return author_attrib.Note;

}
return null;
} public string[] GetAllMemberAutoInfo()
{
MemberInfo[] members=m_type.GetMembers();
string[] result=new string[members.Length]; int n=0;
foreach(MemberInfo meminfo in members)
{
string name=meminfo.Name;
string memberType=meminfo.MemberType.ToString();
string author=Member_Author(meminfo);
if(author==null)
author="Not Known";
result[n]=memberType+":"+name+",autor: "+author;
n++;
}
return result;
} public string[] GetMemberAuthorInof(string memberName)
{
MemberInfo[] members=m_type.GetMember(memberName);
string[] result=new string[members.Length];
int n=0;
foreach(MemberInfo meminfo in members)
{
string name=meminfo.Name;
string memberType=meminfo.MemberType.ToString();
string author=Member_Author(meminfo);
if(author==null)
author="Not Known";
result[n]=memberType+":"+name+",author: "+author;
}
return result;
} protected string Member_Author(MemberInfo meminfo)
{
foreach(Attribute attrib in meminfo.GetCustomAttributes(true))
{
cAuthorAttribute auth=attrib as cAuthorAttribute;
if(auth!=null)
return auth.Name;
}
return null;
} protected Type m_type;
}class cMyApp
{
public static int Main(string[] args)
{
cMyClass myclass=new cMyClass(); cAttributeTest attrib_test=new cAttributeTest(typeof(cMyClass)); Console.WriteLine(attrib_test.GetAuthorName());
foreach(string str in attrib_test.GetAllMemberAutoInfo())
Console.WriteLine(str); Console.WriteLine("***********************************************");
foreach(string str in attrib_test.GetMemberAuthorInof("m_f"))
{
Console.WriteLine(str);
}
// Console.WriteLine(attrib_test.GetAllMemberAutoInfo()[2]);
// Console.WriteLine(attrib_test.GetNotes());
return 0;
}
}
这段代码看明白了，特性如何用也就知道了