C#实现不同窗体之间传递参数

namespace demo_Params
{
    public partial class mainForm : Form
    {
        public mainForm()
        {
            InitializeComponent();
        }
        
        //传递变量到子窗口
        private void btn_Input_BtnClick(object sender, EventArgs e)
        {
            childForm childForm = new childForm();//childForm为新建窗口类
            childForm.str = this.tb_MainFormIn.InputText ;//str为子类的公有变量
            if (childForm.ShowDialog() == DialogResult.OK) return;
        }

        
    }
}

namespace demo_Params
{
    public partial class childForm : Form
    {
        public childForm()
        {
            InitializeComponent();
        }

        //私有变量和赋值，value值在父窗口传递
        private string w_str;
        public string str
        {
            set
            {
                w_str = value;
            }
        }
        //显示父窗口的变量到文本框
        private void btn_getPara_BtnClick(object sender, EventArgs e)
        {
            this.tb_childFormIn.Text = w_str;
        }
    }
}

namespace demo_Params
{
    public partial class mainForm : Form
    {
        public mainForm()
        {
            InitializeComponent();
        }
        //接受参数初始化
        string str = "";      
        //打开子窗口childForm
        private void btn_openWin_BtnClick(object sender, EventArgs e)
        {

            childForm childForm = new childForm();
            childForm.getParam += new backParam(fun_GetChildParam);//绑定事件
            if (childForm.ShowDialog() == DialogResult.OK) return;
        }
        //委托事件执行方法
        void fun_GetChildParam(string w_childpara) 
        {
            str = w_childpara;
        }
        //显示参数到文本框,看看参数能不能调用
        private void btn_Output_BtnClick(object sender, EventArgs e)
        {
            tb_MainFormOut.InputText = str;
        }
    }
}

namespace demo_Params
{

    public delegate void backParam(string str);//声明委托
    public partial class childForm : Form
    {
        public childForm()
        {
            InitializeComponent();
        }
        public event backParam getParam;//委托事件，接受一个string变量
        
        //传回变量 关闭窗口
        private void btn_childFormBack_BtnClick(object sender, EventArgs e)
        {
            getParam(this.tb_childFormIn.Text);//将变量委托
            this.DialogResult = DialogResult.OK;
        }
    }
}

    //Form1上的代码(主窗体)
    public partial class Form1 : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            //显示Form2
            Form2 childForm = new Form2();
            childForm.Show();
            //定义Form2的“爸爸”为Form1 
            calForm.Owner = this;
            
 
            或者
            //Form2 childForm = new Form2();
            //childForm.Show(this);
        }
    }
 
 
    //Form2上的代码(子窗体)
    public partial class Form2 : Form
    {
        public CalibrationForm()
        {
            InitializeComponent();
        }
        private void button_Click(object sender, EventArgs e)
        {
            MainForm mForm = (MainForm)this.Owner;
            //注意 如果textBox1是放在panel1中的 则先找panel1 再找textBox1
            ((TextBox)mForm.Controls["textBox1"]).Text = this.textBox2.Text;
 
            //也可直接将控件的属性Modifiers修改为public 然后直接调用
            mForm.textBox1.Text = this.textBox2.Text;
        }
     }

    //Form1上的代码(主窗体)
    public partial class Form1 : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }
        
        public string str = "你好！";
        private void button1_Click(object sender, EventArgs e)
        {
            //实例化子窗体，并将父窗体的指针this传入
            Form2 childForm = new Form2(this);
            childForm.Show();
        }
    }
 
 
    //Form2上的代码(子窗体)
    public partial class Form2 : Form
    {
        public CalibrationForm()
        {
            InitializeComponent();
        }
 
        private Form1 frmMain;
        public Form2(Form1 mForm)
        {
            InitializeComponent();
            this.frmMain = mForm;
        }
 
        private void button1_Click(object sender,EventArgs e)
 
        {
 
             this.textBox1.Text = mForm.str;  
 
        }
     }