带参数的事件

//对事件的理解
//1 事件解决了通过“=”赋值将原来的事件替换的问题
//2 解决了在外部就可以写入方法的问题，疑问事件只能通过“+=或者-=”来赋值

//事件的本质
//1事件最终被编译器解析成一个私有的委托和两个public Add 和 Remove分别用来实现事件的+=和-=.

带参数的事件实例

用户控件代码
namespace 带参数的事件
{
public delegate void loginDele(object sender,myEvent event1);
public class myEvent
{
public string name
{
get;
set;
}
public string pwd
{
get;
set;
}
public bool log
{
get;
set;
}
}
public partial class ucLogin : UserControl
{
public event loginDele login;
myEvent event1 = new myEvent();

public ucLogin()
{
InitializeComponent();
}

private void button1_Click(object sender, EventArgs e)
{
event1.log = false;
event1.name = textBox1.Text.Trim();
event1.pwd = textBox2.Text;

login(this, event1);
if (event1.log)
{
textBox1.BackColor = Color.Green;
textBox2.BackColor = Color.Green;
}
else
{
textBox1.BackColor = Color.Gray;
textBox2.BackColor = Color.Gray;
}
}
}
}

窗体代码
private void Form1_Load(object sender, EventArgs e)
{
ucLogin1.login += ucLogin1_login;
}

void ucLogin1_login(object sender, myEvent event1)
{
if (event1.name == "aaa" && event1.pwd == "123")
{
event1.log = true;
}
else
{
event1.log = false;
}
}

转载于:https://www.cnblogs.com/lv-sally/p/4516360.html

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