关于动态控件添加的问题

[laughingrat]

我想做个在线测试，需要随机出题，所以要动态的添加n多控件 ，但是在.net2.0里面动态添加的控件，postback 后都消失了，不知道怎么办啊。代码如下

protected void btnRandom_Click(object sender, EventArgs e)
{
DataSet ds = testBLL.Test(Convert.ToInt32(this.tbNumber.Text), "");

this.pSelect.Visible = false;
pTest.Visible = true;

for (int loop = 0; loop < ds.Tables[0].Rows.Count; loop++ )
{
buildTest(ds.Tables[0].Rows[loop],loop);
}

this.pTest.Controls.Add(btnFinish);
}

protected void buildTest(DataRow dr, int loop)
{
David.Nephropathy.Model.test testData = new David.Nephropathy.Model.test();
testData.id = Convert.ToInt32(dr["id"]);
testData.title = dr["title"].ToString();
testData.type = dr["type"].ToString();
testData.answer = dr["answer"].ToString();
testData.A = dr["A"].ToString();
testData.B = dr["B"].ToString();
testData.C = dr["C"].ToString();
testData.D = dr["D"].ToString();
testData.E = dr["E"].ToString();
testData.F = dr["F"].ToString();

Label lbl = new Label();
lbl.ID = "t_" + testData.type + "_" + testData.id.ToString();
Literal ltTitle = new Literal();
ltTitle.Text = (loop + 1).ToString() + " . " + testData.title + "<br>";
lbl.Controls.Add(ltTitle);
switch (testData.type)
{
case "单选题":
RadioButtonList rbl = new RadioButtonList();
if (testData.A != string.Empty)
rbl.Items.Add(new ListItem("A:" + testData.A, "A"));
if (testData.B != string.Empty)
rbl.Items.Add(new ListItem("B:" + testData.B, "B"));
if (testData.C != string.Empty)
rbl.Items.Add(new ListItem("C:" + testData.C, "C"));
if (testData.D != string.Empty)
rbl.Items.Add(new ListItem("D:" + testData.D, "D"));
if (testData.E != string.Empty)
rbl.Items.Add(new ListItem("E:" + testData.E, "E"));
if (testData.F != string.Empty)
rbl.Items.Add(new ListItem("F:" + testData.F, "F"));
lbl.Controls.Add(rbl);

break;
case "多选题":
CheckBoxList cbl = new CheckBoxList();
if (testData.A != string.Empty)
cbl.Items.Add(new ListItem("A:" + testData.A, "A"));
if (testData.B != string.Empty)
cbl.Items.Add(new ListItem("B:" + testData.B, "B"));
if (testData.C != string.Empty)
cbl.Items.Add(new ListItem("C:" + testData.C, "C"));
if (testData.D != string.Empty)
cbl.Items.Add(new ListItem("D:" + testData.D, "D"));
if (testData.E != string.Empty)
cbl.Items.Add(new ListItem("E:" + testData.E, "E"));
if (testData.F != string.Empty)
cbl.Items.Add(new ListItem("F:" + testData.F, "F"));
lbl.Controls.Add(cbl);
break;
case "简答题":
case "问答题":
TextBox tb = new TextBox();
tb.Height = Unit.Pixel(50);
tb.Width = Unit.Pixel(500);
lbl.Controls.Add(tb);
break;
}

Literal ltAnswer = new Literal();
ltAnswer.ID = "answer" + testData.id.ToString();
ltAnswer.Text = testData.answer;
ltAnswer.Visible = false;
lbl.Controls.Add(ltAnswer);



this.pTest.Controls.Add(lbl);

}

[laughingrat]

pTest 是一个panel，

当我点击“完成测试”后，页面一片空白。我调试发现pTest.Controls.Count = 0；
在.net1.0都可以实现的，在2.0里面不支持了！！！

求高手解决！！！！
一定给分！

[laughingrat]

控件可以动态添加成功，可是状态不能回传。！郁闷！！！！

[潜水员2099]

封装到一自定义WebControl里！

[aafshzj]

你确认相关代码执行了吗？

[bearyx]

控件是丢了，但是属性值没丢　用viewstate［“”］判断　当回传时重新动态加一遍

[DePaul]

用无刷新的方法加，ICallBackEventHandler试试，不行用ajax

[蒋晟]

use dynamic databinding to populate the content
reference
http://msdn2.microsoft.com/en-us/library/ms366538.aspx

[xielingxu]

up