1. 普通绑定:
public void button1_Click(object sender, EventArgs e)
{
MessageBox.Show("ok");
}
this.button1.Click += button1_Click;
2. 匿名委托:
this.button1.Click += delegate(object sender, EventArgs e)
{
MessageBox.Show("Click");
};
3. LAMDA表达式:
this.button1.Click += ((sender, e) =>
{
MessageBox.Show("Click");
}
);
编译器会自动推算出表达式中的类型。
4. 过滤条件:
List<User> users = new List<User>();
Func<User, bool> predicate = (
(user) =>
{
return user.UserId > 100;
}
);
List<User> temps = users.Where(predicate).ToList();
等同于:
List<User> temps = users.Where(p => p.UserId > 100).ToList();
List<User> temps = (from p in users where p.UserId > 100 select p).ToList();
List<User> users = new List<User>();
Func<User, bool> predicate = (
(user) => user.UserId > 100
);
List<User> temps = users.Where(predicate).ToList();
单挑语句时不需要使用{},同时可以不使用return来返回结果。
5. 排序:
List<User> users = new List<User>();
List<User> temp1 = users.OrderBy(p=>p.UserId).ToList();
Func<User, int> orderby = (user => user.UserId);
List<User> temp2 = users.OrderBy(orderby).ToList();