关于Timer 传递参数的问题

Question

public void aaa()
{
foreach (TreeNode tn in treeView1.Nodes)
                    {
                        if (tn.Text == "aaa")
                        {
                            t = new System.Timers.Timer(1000);
                            t.Elapsed += new System.Timers.ElapsedEventHandler(picloop);
                            t.Enabled = true;                        }
                    }
}        public void picloop(object sender, System.Timers.ElapsedEventArgs e)
        {
            MessageBox.Show("aaa");
        }
我想在picloop（）中传个参数进去，望高手指教

Answer 1

用个外部变量。public void aaa()
{
foreach (TreeNode tn in treeView1.Nodes)
                    {
                        if (tn.Text == "aaa")
                        {
                            t = new System.Timers.Timer(1000);
                            t.Elapsed += new System.Timers.ElapsedEventHandler(picloop);
                            strs="ppppp";
                            t.Enabled = true;                        }
                    }
}
 string strs;
        public void picloop(object sender, System.Timers.ElapsedEventArgs e)
        {
            MessageBox.Show(strs);
        }

Answer 2

1楼是个办法，当然我推荐你用匿名方法：public void aaa()
{
foreach (TreeNode tn in treeView1.Nodes)
                    {
                        if (tn.Text == "aaa")
                        {
                            t = new System.Timers.Timer(1000);
                            t.Elapsed += new System.Timers.ElapsedEventHandler(delegate (object sender,System.Timers.ElapsedEventArgs e)
{
    MessageBox.Show(tn.Text);
});
                            t.Enabled = true;                        }
                    }
}

Answer 3

不好意思，忘记说明不能用全局变量 ，必须传递参数过去
现在穿参数已经搞定，换了种方式
foreach (TreeNode tn in treeView1.Nodes)
                    {
                        if (tn.Text == msg.From.User)
                        {
                            //t = new System.Timers.Timer(1000);
                            //t.Elapsed += new System.Timers.ElapsedEventHandler(picloop);
                            //t.Enabled = true;
                            MainForm te = new MainForm();
                            TimerCallback timerDelegate = new TimerCallback(te.picloop);
                            System.Threading.Timer t = new System.Threading.Timer(timerDelegate, tn, 0, 1000);
                        }
                    } public void picloop(object tn)
        {
            
            Console.Write("aaa");
        }
现在问题是如何把object tn 转换成treenode

Answer 4

用匿名方法就不存在你说的这个问题
你非不用的话，那可以这样：public void picloop(object tn)
        {
            if(tn is TreeNode)
            {
                Console.Write(((TreeNode)tn).Text);
            }
        }