学步园

来源：http://hackline.net/a/school/ymbc/C/2009/1221/2343.html

 

// 方法一：所有权法
// ************************************************************************
MainForm (按钮名btnMethod1)

publicvoid myMethod1() { this.Text ="方法一"; }
privatevoid btnMethod1_Click(object sender, EventArgs e)
{
 ChildForm child1 =new ChildForm();
 child1.Owner =this; // 必须设置
 child1.ShowDialog();
}

 

 

ChildForm (按钮名btnMethod1)

privatevoid btnMethod1_Click(object sender, EventArgs e)
{
 MainForm main1 = (MainForm)this.Owner;
 main1.myMethod1();
 main1.textBox1.Text =this.textBox1.Text;
}

 

 

 

 

// 方法二：自身传递法
// ************************************************************************
// MainForm (按钮名btnMethod2)

publicvoid myMethod2() { this.Text ="方法二"; }
privatevoid btnMethod2_Click(object sender, EventArgs e)
{
 ChildForm child2 =new ChildForm(this);
 child2.ShowDialog(this);
}

 

 

// ChildForm (按钮名btnMethod2)

private MainForm main2;
public ChildForm(MainForm mainform) // 重载ChildForm
{
 InitializeComponent();
 main2 = mainform;
}
privatevoid btnMethod2_Click(object sender, EventArgs e)
{
 main2.myMethod2();
 main2.textBox2.Text =this.textBox2.Text;
}

 

 

 

 

// 方法三：属性法
// ************************************************************************
// MainForm (按钮名btnMethod3)

publicvoid myMethod3() { this.Text ="方法三"; }
privatevoid btnMethod3_Click(object sender, EventArgs e)
{
 ChildForm child3 =new ChildForm();
 child3.MAIN3 =this;
 child3.ShowDialog();
}

 

 

// ChildForm (按钮名btnMethod3)

private MainForm main3;
public MainForm MAIN3
{
get { return main3; }
set { main3 = value; }
}
privatevoid btnMethod3_Click(object sender, EventArgs e)
{
 main3.myMethod3();
 main3.textBox3.Text =this.textBox3.Text;
}

 

 

 

 

// 方法四：委托法
// ************************************************************************

// MainForm (按钮名btnMethod4)
publicdelegatevoid myDelegate4(); // 声明一个委托
publicvoid myMethod4() { this.Text ="方法四"; }
privatevoid btnMethod4_Click(object sender, EventArgs e)
{
 ChildForm child4 =new ChildForm();
 child4.myDelegate4Test +=new myDelegate4(myMethod4);
 child4.ShowDialog();
}

 

 

// ChildForm (按钮名btnMethod4)

publicevent MainForm.myDelegate4 myDelegate4Test; // 声明事件
privatevoid btnMethod4_Click(object sender, EventArgs e)
{
 myDelegate4Test();
}