• 父子窗口传值


    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();
               
            }
        }

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  • 原文地址:https://www.cnblogs.com/zlytu/p/3065827.html
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