c# winform 用子窗体刷新父窗体,子窗体改变父窗体控件的值

第一种方法:
用委托,frmFather和frmSun是同一组
frmFather

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 Base
{
    public partial class frm_BaseManage : Form
    {

        //........省略
        private void dgvBaseDetails_Blind(int BaseDetails)
        {
            //绑定数据到DataGridView
            dt_BaseDetails = BLL_Base.frm_Base.SelectBaseDetails(BaseDetails);
            dgvBaseDetails.DataSource = dt_BaseDetails.DefaultView;
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            //给指定的BaseName添加具体的BaseDetails
            if (lstBaseName.SelectedIndex != -1)
            {   
                ListBoxItemObject lstItemObj = (ListBoxItemObject)lstBaseName.SelectedItem;
                frm_BaseAdd frmBaseAdd = new frm_BaseAdd(int.Parse(lstItemObj.id), lstItemObj.name);
                frmBaseAdd.refreshEvent += new frm_BaseAdd.dgvRefresh(dgvBaseDetails_Blind);
                frmBaseAdd.ShowDialog();
            }
            else
            {
                MessageBox.Show("请选中要添加的基本资料", "错误！", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
         //........省略
    }
}

frmSun

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 Base
{
    public partial class frm_BaseAdd : Form
    {
        private int BaseNameID;
        public delegate void dgvRefresh(int BaseNameID);
        public event dgvRefresh refreshEvent;

        public frm_BaseAdd()
        {
            InitializeComponent();
        }


        public frm_BaseAdd(int BaseNameID,string BaseName)
        {
            //重截构造函数传递参数
            InitializeComponent();
            this.BaseNameID = BaseNameID;
            this.Text = "添加"+BaseName+"基础资料";
            grpTitle.Text = BaseName+"基础资料设置";
        }

        private void btnCancel_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void btnSave_Click(object sender, EventArgs e)
        {
            Save();
        }


        private void Save()
        {
            
            //保存基础资料具体内容到
            string BaseDetails = txtBaseDetails.Text;
            bool IsDefault = chkIsDefault.Checked;
            BLL_Base.frm_Base.InsertBaseDetails(BaseNameID, BaseDetails, IsDefault);
            MessageBox.Show("添加成功", "提醒", MessageBoxButtons.OK, MessageBoxIcon.Information);
            txtBaseDetails.Text = "";
            chkIsDefault.Checked = false;
            refreshEvent(BaseNameID);
        }


    }
}

讲解：

本例子要实现在frmFather中打开frmSun,当frmSun保存时调用frmFather中的dgvBaseDetails_Blind(int BaseDetails)方法来刷新DataGridView.

1、在父窗体中，创建子窗体时，绑定方法到委托，见frmFather中的30行代码：

frmBaseAdd.refreshEvent += new frm_BaseAdd.dgvRefresh(dgvBaseDetails_Blind);

frmBaseAdd 这个是frmSun窗体名，refreshEvent是frmSun中定义的委托对象，frm_BaseAdd.dgvRefresh()是frmSun中定义的委托。见frmSun代码的15、16行。

2、在子窗体中，定义委托类型和创建委托对象。

public delegate void dgvRefresh(int BaseNameID);        

public event dgvRefresh refreshEvent;

public delegate：表示是委托，公用

void：无返回值

dgvRefresh(int BaseNameID)：委托方法，参数是一个整形

public event：http://msdn.microsoft.com/zh-cn/library/8627sbea.aspx EVENT参考这里

dgvRefresh  refreshEvent 创建委托事件refreshEvent

3、在子窗体中，调用refreshEvent，来委托调用父窗体的dgvBaseDetails_Blind，见frmSun中的54行

refreshEvent(BaseNameID);

 个人总结：

第二种方法:
用变量,Form4和Form5是同一组
Form4

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;
        }
    }
}