WinForm中的窗体间传值(委托在窗体应用程序的运用)

在WinForm编程中我们经常需要进行俩个窗体间的传值。

下面我给出了两种方法，来实现传值

一、在输入数据的界面中定义一个属性，供接受数据的窗体使用

1、子窗体

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

namespace DevControl
{
    public partial class FEdit : DevExpress.XtraEditors.XtraForm
    {
        public FEdit()
        {
            InitializeComponent();
        }

       public string Value { get; private set; }

        private void btnOk_Click(object sender, EventArgs e)
        {
            this.Value = this.txtData.Text;
        }

    }
}

2、父窗体

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 DevControl
{
    public partial class View : Form
    {
        public View()
        {
            InitializeComponent();
        }

        private void barButtonItem4_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            FEdit edit = new FEdit();
            if (edit.ShowDialog()==DialogResult.OK)
            {
                this.txtDate.Text = edit.Value;

            }
　　   }
    }
}

二、在输入数据的界面中定义一个委托，委托中的参数是所输入的数据

1、子窗体

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

namespace DevControl
{
    public partial class FEdit : DevExpress.XtraEditors.XtraForm
    {
        public FEdit()
        {
            InitializeComponent();
        }

        private void btnOk_Click(object sender, EventArgs e)
        {
            if (this.showDialogHandler!=null)
            {
                this.showDialogHandler(this.txtData.Text);//给委托参数赋值
            }
            this.Dispose();//释放窗体
        }

        private Action<object> showDialogHandler;//定义一个委托，它有一个参数

        public void ShowDialog(Action<object> showDialogHandler)
        {
            this.showDialogHandler = showDialogHandler;
            this.Show();
        }

    }
}

2、父窗体

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 DevControl
{
    public partial class View : Form
    {
        public View()
        {
            InitializeComponent();
        }

        private void barButtonItem4_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            FEdit edit = new FEdit();
            edit.ShowDialog(new Action<object>((obj) =>
            {
                var result = (string)obj;
                this.txtDate.Text = result;
            } ));
        }
    }
}