C# 委托页面间传值

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form1
定义委托
定义事件
定义事件方法
在能得到值的地方写上你的事件方法，并把值做为参数

form2
定义form1的事件引用
在+=后面的方法里就可以取到form1的值了

public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        //定义委托
        public delegate void MyDelegate(object sender, MyEventArgs e);
        //定义事件
        public event MyDelegate MyEvent;

        private void button1_Click(object sender, EventArgs e)
        {
            Form2 f2 = new Form2();
            //实例化一个Form2;
            MyEventArgs me=new MyEventArgs();
            //自定义的事件数据类实例；
            me.MyValue="this.textBox1.Text2222222222";
            me.V2 = "V2";
            //Form1中textBox的值传给事件数据类实例；
            this.MyEvent += new MyDelegate(f2.SetTextValue);
            //事件订阅自己建的委托；
            MyEvent(this,me);
            //执行事件；
            f2.Show();
            //Form2显示
        }
    }
    //
    public class MyEventArgs:EventArgs
    {
        public string MyValue="";

        public string V2
        {
            get;
            set;
        }
    }

    public partial class Form2 : Form
    {
        Form1 f1;
        public Form2()
        {
            InitializeComponent();
        }
        public void SetTextValue(object sender, MyEventArgs e)
        {
            MessageBox.Show(e.MyValue+e.V2);
        }

}

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//========B画面=========
public delegate void ValueChange(string drugCode, string drugName);
private ValueChange CallBack;

        /// <summary>
        /// コンストラクタ
        /// </summary>
        public DrugSearchForm(ValueChange callBack)
        {
            InitializeComponent();
            // イベント取得
            this.CallBack = callBack;
        }

//A画面に値を渡す
string externalDrugCode = this.DrugDataGridView.Rows[ht.RowIndex].Cells["EXTERNAL_DRUG_CODE"].Value.ToString();
string drugName = this.DrugDataGridView.Rows[ht.RowIndex].Cells["DRUG_NAME"].Value.ToString();
this.CallBack(externalDrugCode, drugName);

//========A画面=========

        /// <summary>
        /// 一覧で値セット時
        /// </summary>
        /// <param name="drugCode">コード</param>
        /// <param name="drugName">名</param>
        private void CallBack(string drugCode, string drugName)
        {
            this.DrugCodeTextBox.Text = drugCode;
            this.DrugNameTextBox.Text = drugName;

}

// B画面呼出
DrugSearchForm drugSearchForm = new DrugSearchForm(this.CallBack);

C# Windows Form 刷新父窗体

第一种方法:
用委托,Form2和Form3是同一组
Form2

C#代码

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace TestMouseMove{    public delegate void SetVisiableHandler();    public partial class Form2 : Form    {        public Form2()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            Form3 frm = new Form3(new SetVisiableHandler(SetVisiable));            frm.Show();        }        private void SetVisiable()        {            SetVisiable(this.label1, !this.label1.Visible);        }        private void SetVisiable(Control control, bool visiable)        {            if (this.Controls.Contains(control))            {                control.Visible = visiable;            }        }    }}

Form3

C#代码

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace TestMouseMove{    public partial class Form3 : Form    {        private SetVisiableHandler m_setVisible;        public Form3(SetVisiableHandler setvisible)        {            InitializeComponent();            this.m_setVisible = setvisible;        }        private void btnVisible_Click(object sender, EventArgs e)        {            if (this.m_setVisible != null)            {                this.m_setVisible();            }        }    }}

第二种方法:
用变量,Form4和Form5是同一组
Form4

C#代码

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;namespace TestMouseMove{    public partial class Form4 : Form    {        public Form4()        {            InitializeComponent();        }        #region 子窗口刷新父窗口的值        private string strLabel1 = "";        public string StrLabel1        {            get            {                return strLabel1;            }            set            {                strLabel1 = value;                this.label1.Text = strLabel1;            }        }        #endregion        private void button1_Click(object sender, EventArgs e)        {            Form5 form5 = new Form5(this);//这里注意传个this            form5.Show();        }    }}

Form5

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

namespace TestMouseMove
{
public partial class Form5 : Form
    {
        Form4 form4 = new Form4();

public Form5(Form4 formFrm)//这个构造方法里有参数
        {
            form4 = formFrm; //这个必须要有
            InitializeComponent();
        }

private void button1_Click(object sender, EventArgs e)
        {
            form4.StrLabel1 = this.textBox1.Text;
        }
    }
}

第3种方法

遍历窗体查找

foreach (Form frm in Application.OpenForms)
            {
                if (frm.Name == "要找的状体")
                {
                    frm.Refresh();
                }
            }

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public class MockHostSettingEventArgs : EventArgs
    {
        public MockHostSettingEventArgs(MockHostController.CommandSetting commandSet)
        {
            this.CommandSet = commandSet;
        }
        public MockHostController.CommandSetting CommandSet
        {
            get;
            set;
        }
    }
——————————————————子页面传给父页面值———————————————————————————
父页面
        private void SetHostSettingButton_Click(object sender, EventArgs e)
        {
          //跳转子页面
            SetHostSettingForm ssf = new SetHostSettingForm(this);
            ssf.ShowDialog();
        }
   // 事件方法接收数据
        public void OnGetHostSet(object sender, MockHostSettingEventArgs e)
        {
            lock (comSet)
            {
                this.comSet = e.CommandSet;
            }
        }
———————————————————————————————————————————————————————————————
子页面
//定义委托时间
        public event EventHandler<MockHostSettingEventArgs> MockHostSettingEvent;
        public SetHostSettingForm(MockHostForm Mockhostfrom)
        {
            InitializeComponent();
//订阅事件
            this.MockHostSettingEvent += new EventHandler<MockHostSettingEventArgs>(Mockhostfrom.OnGetHostSet);
        }

//传值
   if (this.MockHostSettingEvent != null)
                    {
                        this.MockHostSettingEvent(this, new MockHostSettingEventArgs(this.CmdSetting));
                    }

C# 委托 页面间传值

C# 委托页面间传值