[C#(WinForm)] – 表單間傳值方法

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

 

// 方法一：所有權法
// ************************************************************************
MainForm (按鈕名btnMethod1)

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

 

 

ChildForm (按鈕名btnMethod1)

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

 

 

 

 

// 方法二：自身傳遞法
// ************************************************************************
// MainForm (按鈕名btnMethod2)

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

 

 

// ChildForm (按鈕名btnMethod2)

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

 

 

 

 

// 方法三：屬性法
// ************************************************************************
// MainForm (按鈕名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 (按鈕名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：委託法
// ************************************************************************

// MainForm (按鈕名btnMethod4)
publicdelegatevoid myDelegate4(); // 聲明一個委託
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 (按鈕名btnMethod4)

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