Question

asp.net每点一次按钮添加一个控件怎么实现？

代码如下：为什么不能实现呢？Global文件有Session了！
protected void Btadd_Click(object sender, EventArgs e)
{
int i = (int)Session["count"];
i++;
FileUpload ful = new FileUpload();
ful.ID ="f" + i.ToString();
Panel1.Controls.Add(ful);
Session["count"] = i;

Answer 1

用JS实现即可,这里实现的是HTML的FILE控件，可以类似实现ASP.NET的WEB控件FileUpload

<script language="javascript" type="text/javascript">
//增加文件上传控件
function AddFileUpload()
{
var str = '<span><br/><input type="file" unselectable="on" onchange="return CheckFile(this)"/> <input type="button" value="删除" onclick="deleteNode(this.parentNode)"></span>'; document.getElementById("UploadDiv").insertAdjacentHTML("beforeEnd",str);
}

//删除结点
function deleteNode(obj)
{
obj.removeNode(true);
}
</script>

<center>
<div id="UploadDiv">
<span id="UploadSpan">
<input id="FileUpload" type="file" unselectable="on" onchange="return CheckFile(this);"/>
</span>
</div>
</center>
<p>
<center>
<input type="button" value="增行" onclick="AddFileUpload()" /><br />
</center>
</p>