A demo of Custom Attributes

Using system;
Using system. Collections. Generic;
Using system. text;
Using system. reflection; // use reflection

Namespace Cui. useattribute
{
// Apply the attributeusage feature to control the usefulness of this feature
[Attributeusage (attributetargets. All, allowmultiple = false, inherited = true)]
Public class myattribute: attribute // must inherit from Attribute Class
{
Private string _ username; // User Name
Private string _ lastlogintime; // Last Logon Time
Private string _ remark; // remarks

Private myattribute (){}

Public myattribute (string username, string lastlogintime)
{
This. _ username = username;
This. _ lastlogintime = lastlogintime;
}

Public String Username
{
Get {return _ username = NULL? "Username is null": This. _ username ;}
}
Public String lastlogintime
{
Get {return _ lastlogintime ;}
}
Public String remark
{
Get {return _ remark = NULL? "Remark is null": _ remark ;}
Set {_ remark = value ;}
}

Public override string tostring ()
{
Return string. Format ("username: {1} {0} lastlogintime: {2} {0} remark: {3} {0} {0 }",
Environment. newline, this. username, this. lastlogintime, this. remark );
}


}

[My ("Jie", "2008-05-06", remark = "Hello, I'm Jie.")]
Public class usemyattribute
{
Public void saysomething ()
{
Console. writeline ("Say something ");
}
}

Public class test
{
Public static void main ()
{
Type type = typeof (usemyattribute );
Myattribute = attribute. getcustomattribute (type, typeof (myattribute) as myattribute;

If (myattribute! = NULL)
{
Console. writeline ("username: {0}", myattribute. username );
Console. writeline ("lastlogintime: {0}", myattribute. lastlogintime );
Console. writeline ("remark: {0}", myattribute. remark );
Console. writeline ();
}

Object OBJ = activator. createinstance (typeof (usemyattribute ));
Methodinfo MI = type. getmethod ("saysomething ");
Mi. Invoke (OBJ, null );


Console. readkey (true );
}
}
}