窗体传值可以分为两类。
1、主窗体往子窗体传值
有两种方法，一种是在子窗体提供重载构造函数，利用重载构造函数传递值，适用于传值数量比较少；第二种是，在子窗体中定义一个主窗体对象，然后就可以接收到主窗体的属性值了，适用于传值数量大。
主窗体代码如下：
public
partial
class
frmParent : Form
{ private string strValueA = ""; public string StrValueA { get { return this.strValueA; } set { this.strValueA = value; } } public frmParent() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { this.strValueA = textBox1.Text; frmChild frmchild = new frmChild(); frmchild.Owner = this; frmchild.ShowDialog(); frmchild.Dispose(); } private void button2_Click(object sender, EventArgs e) { frmChild frmchild = new frmChild(this.textBox1.Text); string returnValue = ""; if (frmchild.ShowDialog() == DialogResult.OK) { returnValue = frmchild.Str; this.textBox1.Text = returnValue; } } }
子窗体代码如下：
public
partial
class
frmChild : Form
{ private string str; public string Str { get { return this.str; } set { this.str = value; } } private frmParent frmparent; public frmChild() { InitializeComponent(); } public frmChild(string str) { this.str = str; InitializeComponent(); this.textBox1.Text = str; } private void frmChild_Load(object sender, EventArgs e) { frmparent = (frmParent)this.Owner; //this.textBox1.Text = frmparent.StrValueA; } private void button1_Click(object sender, EventArgs e) { //frmparent = (frmParent)this.Owner; this.Str = this.textBox1.Text; this.DialogResult = DialogResult.OK; this.Close(); } }
2、从子窗体返回值到主窗体中
利用了子窗体的属性保存子窗体的值，在主窗体中可以访问到子窗体的属性
主窗体代码如下：
public
partial
class
frmParent : Form
{ private string strValueA = ""; public string StrValueA { get { return this.strValueA; } set { this.strValueA = value; } } public frmParent() { InitializeComponent(); } private void button2_Click(object sender, EventArgs e) { frmChild frmchild = new frmChild(this.textBox1.Text); string returnValue = ""; if (frmchild.ShowDialog() == DialogResult.OK) { returnValue = frmchild.Str; this.textBox1.Text = returnValue; } } }
子窗体代码如下：
public
partial
class
frmChild : Form
{ private string str; public string Str { get { return this.str; } set { this.str = value; } } private frmParent frmparent; public frmChild() { InitializeComponent(); } private void frmChild_Load(object sender, EventArgs e) { frmparent = (frmParent)this.Owner; //this.textBox1.Text = frmparent.StrValueA; } private void button1_Click(object sender, EventArgs e) { //frmparent = (frmParent)this.Owner; this.Str = this.textBox1.Text; this.DialogResult = DialogResult.OK; this.Close(); } }
