Click here to Skip to main content
15,867,453 members
Articles / Web Development / ASP.NET
Article

Dynamic generate control according to the user's operation

Rate me:
Please Sign up or sign in to vote.
2.00/5 (1 vote)
18 Sep 2007 14.1K   173   11  
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.
Screenshot - demo.gif

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

C#
[Serializable]
   public class ContactControl
However, the genereted controls infomation are stored in the viewstate.
C#
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.
C#
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

License

This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

A list of licenses authors might use can be found here


Written By
China China
This member has not yet provided a Biography. Assume it's interesting and varied, and probably something to do with programming.

Comments and Discussions

 
-- There are no messages in this forum --