本次示例效果如下: Form1為父窗體(包含textBox1、button1) Form2為子窗體(包含textBox2、button2) 父窗體給子窗體傳值 ================== 1.點擊Form1的button1 打開Form2 父窗體給子窗體傳值 可以調用重載子窗體的構造函數 直接傳入相關數值 public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 frm2 = new Form2(this.textBox1.Text); frm2.Show(); } } public partial class Form2 : Form { public Form2() { InitializeComponent(); } public Form2(string strTextBox1Text) { InitializeComponent(); this.textBox2.Text = strTextBox1Text; } } 2.點擊Form1的button1 打開Form2 並調用子窗體Form2的公開屬性或方法 將Form1的textBox1的值設置給Form2的textBox2 public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 frm2 = new Form2(); frm2.TextBox2Text = this.textBox1.Text; frm2.Show(); } } public partial class Form2 : Form { public Form2() { InitializeComponent(); } public string TextBox2Text { set { this.textBox2.Text = value; } get { return this.textBox2.Text; } } } 3.點擊Form1的button1 打開Form2 在Form2_Load調用父窗體Form1的公開屬性或方法 將Form1的textBox1的值設置給Form2的textBox2 public partial class Form1 : Form { public Form1() { InitializeComponent(); } public string TextBox1Text { set { this.textBox1.Text = value; } get { return this.textBox1.Text; } } private void button1_Click(object sender, EventArgs e) { Form2 frm2 = new Form2(); frm2.Show(this);//或 frm2.ShowDialog(this); ////或者 //Form2 frm2 = new Form2(); //frm2.Owner = this; //frm2.Show();//或 frm2.ShowDialog(); } } public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void Form2_Load(object sender, EventArgs e) { Form1 frm1 = (Form1)this.Owner; this.textBox2.Text = frm1.TextBox1Text; } } 子窗體給父窗體傳值 ================== 4.點擊Form1的button1 打開Form2 再點擊Form2的button2 在button2_Click事件中 通過this.Owner將Form2的textBox2的值設置給Form1的textBox1 並關閉Form2 public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { Form2 frm2 = new Form2(); frm2.Show(this);//或 frm2.ShowDialog(this); ////或者 //Form2 frm2 = new Form2(); //frm2.Owner = this; //frm2.Show();//或 frm2.ShowDialog(); } } public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void button2_Click(object sender, EventArgs e) { Form1 frm1 = (Form1)this.Owner; //注意 如果textBox1是放在panel1中的 則先找panel1 再找textBox1 ((TextBox)frm1.Controls["textBox1"]).Text = this.textBox2.Text; this.Close(); } } 5.點擊Form1的button1 打開Form2 再點擊Form2的button2 在button2_Click事件中 通過this.Owner及調用父窗體Form1的公開屬性或方法 將Form2的textBox2的值設置給Form1的textBox1 並關閉Form2 public partial class Form1 : Form { public Form1() { InitializeComponent(); } public string TextBox1Text { set { this.textBox1.Text = value; } get { return this.textBox1.Text; } } private void button1_Click(object sender, EventArgs e) { Form2 frm2 = new Form2(); frm2.Show(this);//或 frm2.ShowDialog(this); ////或者 //Form2 frm2 = new Form2(); //frm2.Owner = this; //frm2.Show();//或 frm2.ShowDialog(); }www.2cto.com } public partial class Form2 : Form { public Form2() { InitializeComponent(); } private void button2_Click(object sender, EventArgs e) { Form1 frm1 = (Form1)this.Owner; frm1.TextBox1Text = this.textBox2.Text; this.Close(); } }