Introduction
sometimes we need to dynamic generate controls according to the user's operation, such as in a button click event. However, after the post back, the dynamic generated controls would disappear. I use viewstate to keep the infomation of the auto generated controls and generated them at the page load. Background
Using the code
Unfortunately the WebControl class is unserializable, so I define a serializable class to store the info of dynamic generated controls
[Serializable]
public class ContactControl
However, the genereted controls infomation are stored in the viewstate.
private List<ContactControl> ContactControls
{
get
{
return ReadViewState<List<ContactControl>>("AddedControls", new List<ContactControl>());
}
set
{
ViewState["AddedControls"] = value;
}
}
At every page load, get the genereted controls information and generate them.
protected override void OnLoad(EventArgs e)
{
List<ContactControl> contactControls = ContactControls;
foreach (ContactControl contactControl in contactControls)
{
GenerateControl(contactControl);
}
}
Points of Interest
Although it can works, I believe it was not the best solution. Please email me if some one have a better solution
