C# 不同窗体之间传值和调用

1.子窗体事件刷新父窗体界面值 

子窗体定义委托和事件  

//声明一个委托
public delegate void DisplayUpdateDelegate(string str);
//声明事件
public event DisplayUpdateDelegate ShowUpdate;
private void Form2_Load(object sender, EventArgs e)
{

}

private void button1_Click(object sender, EventArgs e)
{
    if (ShowUpdate != null)
    {
        ShowUpdate(textBox1.Text.ToString());
    }
}

 

父窗体 

private void button3_Click(object sender, EventArgs e)
{
    Form2 _frm2 = new Form2();
    _frm2.ShowUpdate += new Form2.DisplayUpdateDelegate(ShowMessage);
    _frm2.Show();
}

private void ShowMessage(string str)
{
    textBox1.Text = str;
}

 

 

2.父窗体的事件刷新子窗体的值 

父窗体代码  

public delegate void ChangeSonWindowDelegate(string str);
ChangeSonWindowDelegate _changeSonWindow;
private void button1_Click(object sender, EventArgs e)
{

    Form2 _frm2 = new Form2();
     _changeSonWindow = new ChangeSonWindowDelegate(_frm2.ShowMessage);
    _frm2.Show();

}

private void button2_Click(object sender, EventArgs e)
{

    _changeSonWindow(textBox1.Text);

}

 

子窗体代码 

public void ShowMessage(string str)
{
    textBox1.Text = str;

}

 

 

3.父窗体调用子窗体的方法。子窗体必须是显示状态。 

 父窗体

Form2 _frm;
private void button1_Click(object sender, EventArgs e)
{
    timer1.Interval = 5000;
    timer1.Enabled = true;
    _frm = new Form2();            
    _frm.ShowDialog();        

}    

private void timer1_Tick(object sender, EventArgs e)
{
    
    _frm.WriteLog("调用子窗体方法2222");
}

 

子窗体 

public void WriteLog(string str)
{
    Console.WriteLine(str);
}

 

 

4.子窗体值->父窗体 

父窗体 

private void button1_Click(object sender, EventArgs e)
{
    Form2 myFrm = new Form2();           
    if(myFrm.ShowDialog()==DialogResult.OK)
    {
        string boyName = myFrm.BoyName;
        int age = myFrm.Age;
    }
}

 

子窗体

private string _boyName;
private int _age;

public string BoyName { get => _boyName; set => _boyName = value; }
public int Age { get => _age; set => _age = value; }

private void button1_Click(object sender, EventArgs e)
{
    BoyName = "jim";
    Age = 18;
    this.DialogResult = DialogResult.OK;
}

 

 

5.跳出子窗体，在子窗体上实时显示信息

父窗体

ShowRunning(true);
ShowRunningMsg("正在扫描中，请耐心等待......");

关闭子窗体 ShowRunning(false);

private delegate void ShowRunningDelegate(bool isShow);

private void ShowRunning(bool isShow)
{
    ShowRunningDelegate _showRunning = new ShowRunningDelegate(ShowRunningMethod);
    this.Invoke(_showRunning, new object[] { isShow});

}

FrmRunning _FrmRunning;
public delegate void ShowRunningMsgDelegate(string msg);
ShowRunningMsgDelegate ShowRunningMsg;
private void ShowRunningMethod(bool isShow)
{
    if (isShow)
    {          
       
        _FrmRunning = new FrmRunning();                
        ShowRunningMsg = new ShowRunningMsgDelegate(_FrmRunning.ShowRuningMsg);

        _FrmRunning.Show();
    }
    else
    {
        if (_FrmRunning != null)
        {
            _FrmRunning.Close();
        }
    }

}

 

子窗体 

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace BlueToothATE
{
    public partial class FrmRunning : Form
    {
        public FrmRunning()
        {
            InitializeComponent();
            
        }

        private void FrmRunning_Load(object sender, EventArgs e)
        {

        }

       public void ShowRuningMsg(string msg)
       {
            lblMsg.Text = msg;
        }



    }
}