Question

c#项目中动态创建radiobutton,为什么不会更新？

private void browse() {
string sql1 = "select * from answer where question_id='" +id[N]+ "'";
DataSet ds1 = SqlHelper.ExecuteDataset(SqlHelper.connectionString, CommandType.Text, sql1);
string[] answer = new string[ds1.Tables[0].Rows.Count];

for (int j = a; j < ds1.Tables[0].Rows.Count; j++) {
DataRow dr3 = ds1.Tables[0].Rows[j];
answer[j] = Convert.ToString(dr3[1]);
}

RadioButton[] radioButtons= new RadioButton[answer.Length];

for (int i = 0; i < answer.Length; ++i) {
//MessageBox.Show(answer[i]);
radioButtons[i] = new RadioButton();
radioButtons[i].Text = answer[i];
radioButtons[i].Location = new System.Drawing.Point(
10, 20 + i * 30);
groupBox1. Controls.Add(radioButtons[i]);

}
private void btnnext_Click(object sender, EventArgs e)
{
N = N + 1;
if (N == Total)
{
MessageBox.Show("已经是最后一题！");
}
else
{

browse();
}

}
}
点击btnnext时radiobutton内容不会更新，测试answer数组会更新，求解！

Answer 1

在同一座标已经ADD一个radiobutton了，你那个button事件相当于又ADD一个。显示在之前的下面。

Answer 2

数据没有回传

追问

该怎么改呀，谢谢！

Answer 3

groupBox1 清空了没有？