WinForm窗体之间的传值

写一个类，就几行代码而已：

using System;
using System.Collections.Generic;
using System.Text;

namespace chuanzhi
{
public sealed class Setting
{
private static volatile Setting instance;
private static object syncRoot = new Object();

private Setting() { }
public static Setting Instance
{
get
{
if (instance == null)
{
lock (syncRoot)
{
if (instance == null)
instance = new Setting();
}
}
return instance;
}
}

public string UserID;

}
}

窗体1：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace chuanzhi
{
public partial class FrmMain : Form
{
public FrmMain()
{
InitializeComponent();
}

Setting m_set = Setting.Instance;

private void btnGo_Click(object sender, EventArgs e)
{
string UserID = this.txtUserID.Text.Trim();
m_set.UserID = UserID;//这里是关键
FrmNew f = new FrmNew();
f.Show();
}
}
}

窗体2：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace chuanzhi
{
public partial class FrmNew : Form
{
public FrmNew()
{
InitializeComponent();
}

Setting m_set = Setting.Instance;
private void FrmNew_Load(object sender, EventArgs e)
{
this.txtUserID.Text = m_set.UserID;//这里是赋值，关键所在
}
}
}

不管需要传多少值，只需要灵活的在这个类里面增加一个变量即可。