上图所示的窗体传值示例，在windows应用程序中经常都会碰到，以前是想办法将form1对象传给form2，然后在form2中在适当的时机调用form1对象上的控件并设置值：
Form1.cs：
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
/// <summary>
/// 新增属性,设置textBox1的文本,供Form2调用
/// </summary>
public string Value
{
set { textBox1.Text = value; }
}
private void button1_Click(object sender, EventArgs e)
{
(new Form2()).Show(this);//Form1传给Form2
}
}
}Form2.cs：
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
/// <summary>
/// 双击选择
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void listBox1_DoubleClick(object sender, EventArgs e)
{
Form frm = this.Owner;
if (frm is Form1)
((Form1)frm).Value = listBox1.SelectedItem.ToString();
this.Close();
}
}
}今天在一个项目中发现了另一种方法，更为简便：
Form1.cs：
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
Form2 frm = new Form2();
textBox1.Text = frm.GetValue();
}
}
}Form2.cs：
using System;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
/// <summary>
/// 获取文本框中的值
/// </summary>
/// <returns></returns>
public string GetValue()
{
this.ShowDialog();//一定不能用this.Show()
//下边代码得this.Close()后才能继续执行
if (listBox1.SelectedIndex != -1)
return listBox1.SelectedItem.ToString();
else
return string.Empty;
}
/// <summary>
/// 双击选择
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void listBox1_DoubleClick(object sender, EventArgs e)
{
this.Close();
}
}
}
评论（0）
暂无评论。