问题描述：有2个UserControl：UserControl1 里有一个Button，UserControl2 里面有一个TextBox，这2个控件都加载到了主窗体Form1 上。要求的是，点击 UserControl1 的button 显示 UserControl2中TextBox输入的内容。
一般来讲有2种方式：
1. 公开属性
2. 声明事件
来看看这2种方式的操作代码：
1. 公开2个UserControl的属性。并在Form1中使用
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent(); } public Button Btn // Define Btn as public
{
get
{
return this.button1;
}
}
}
UserControl1
public partial class UserControl2 : UserControl
{
public UserControl2()
{
InitializeComponent();
} public TextBox textbox // define textbox as public
{
get
{ return this.textBox1; }
}
}
UserControl2
在From1中注册Button的事件
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.userControl11.Btn.Click += new EventHandler(Btn_Click);
} void Btn_Click(object sender, EventArgs e)
{
MessageBox.Show(this.userControl21.textbox.Text);
}
}
注册Button事件
2. 声明事件
public partial class UserControl1 : UserControl
{
public UserControl1()
{
InitializeComponent(); }
public event EventHandler BtnClick; //define one public Click event. private void button1_Click(object sender, EventArgs e)
{
BtnClick(sender, e); // just do it.
}
}
UserControl1
public partial class UserControl2 : UserControl
{
public UserControl2()
{
InitializeComponent();
} public event Action<string> GetText; //define one action to get textbox's text value private void textBox1_TextChanged(object sender, EventArgs e)
{
GetText(textBox1.Text); // Get this text after input.
}
}
UserControl2
在Form1中调用
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
this.userControl21.GetText += new Action<string>(userControl21_GetText); // register gettext event.
this.userControl11.BtnClick += new EventHandler(userControl11_Click); // Register Click event.
}
string text = null;
void userControl11_Click(object sender, EventArgs e) // implement it
{
MessageBox.Show(text);
} void userControl21_GetText(string obj) // implement it.
{
text = obj;
}
}