winform动态创建radio以及使用委托判断哪个选中

创建radiobutton

 //绘制界面
        public void DrawInterface(DataTable dt)
        {
            if (dt == null ||dt.Rows.Count==0)
            {
                MessageBox.Show("数据为空，返回重新操作");
                this.Close();
            }
            else
            {
                int dtLength = dt.Rows.Count;
                Label[] l1 = new Label[dtLength];
                RadioButton[] rb = new RadioButton[dtLength];
                int topStep = 10;
                for (int i = 0; i < dtLength; i++)
                {
                    int leftStep = 100;
                    // 
                    // radioButton
                    // 
                    rb[i] = new RadioButton();
                    rb[i].AutoSize = true;
                    rb[i].Name =i.ToString();
                    rb[i].Left =leftStep;
                    rb[i].Top = topStep;
                    rb[i].Text = dt.Rows[i]["tachename"].ToString();
                    rb[i].CheckedChanged += new System.EventHandler(this.radioButton_CheckedChanged);
                    // 
                    // label
                    // 
                    l1[i] = new Label();
                    l1[i].AutoSize = true;
                    l1[i].Name = "lab" + i.ToString();
                    l1[i].Left = leftStep + 200;
                    l1[i].Top = topStep;
                    l1[i].Text = dt.Rows[i]["transactor"].ToString();
                    //添加到panel中去
                    this.content.Controls.Add(rb[i]);
                    this.content.Controls.Add(l1[i]);
                    topStep = topStep + 30;
                }

                //默认选中
                rb[0].Checked = true;
                topStep += 100;
                //确定
                Button ok = new Button();
                ok.Top = topStep;
                ok.Left = 120;
                ok.Name = "ok";
                ok.Height = 28;
                ok.FlatStyle = FlatStyle.System;
                ok.Text = "确定";
                ok.Click += new EventHandler(btn_Click_1);
                this.content.Controls.Add(ok);
                //取消
                Button cancel = new Button();
                cancel.Top = topStep;
                cancel.Left =ok.Width+150;
                cancel.Name = "cancel";
                cancel.Text = "取消";
                cancel.Height = 28;
                cancel.Click += new EventHandler(btn_Click_2);
                this.content.Controls.Add(cancel);
            }
        }

注意循环里边的 选择事件绑定同一个radioButton_CheckedChanged方法里

rb[i].CheckedChanged += new System.EventHandler(this.radioButton_CheckedChanged);

运用委托进行选中

//全局变量
string backid="";
private void radioButton_CheckedChanged(object sender, EventArgs e)
{
//选中的时候才执行，失去不执行...
if (((RadioButton)sender).Checked)
{
      backid = ((RadioButton)sender).Name;
　　 //MessageBox.Show(backid);//去掉if会弹出两次(上一个的失去，这一个的得到)   
}
}

根据结果进行操作

public void btn_Click_2(object sender, System.EventArgs e)
{
     MessageBox.Show(backid);           
}

参考：

http://www.cnblogs.com/njnudt/archive/2007/07/30/835978.html

http://flydzk.blog.163.com/blog/static/982395322010188565455/