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Viewstate with Custom Controls

Posted on 2003-12-05
5
Medium Priority
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Last Modified: 2010-08-05
Hi people,

I've created a custom control with 3 textboxes amongst otherstuff.

Onpostback my controls lose their values. I've played with the StateBag / Viewstate but cannot get it to work.

Any places I could read up on or any sugested ideas.
Code Snippets

private bool _isTrackingViewState = true;
private StateBag _viewState;

            #region IStateManager Members

            protected override StateBag ViewState
            {
                  get
                  {
                        if(_viewState == null)
                        {
                              _viewState = new StateBag(false);
                              if(_isTrackingViewState)
                              {
                                    ((IStateManager)_viewState).TrackViewState();
                              }
                        }

                        return _viewState;
                  }
            }

            void IStateManager.TrackViewState()
            {
                  // TODO:  Add FAQ.TrackViewState implementation
                  if(_viewState != null)
                  {
                        ((IStateManager)_viewState).TrackViewState();
                  }
                  _isTrackingViewState = true;
            }

            bool IStateManager.IsTrackingViewState

            {
                  get
                  {
                        return _isTrackingViewState;
                  }
            }

            object IStateManager.SaveViewState()
            {
                  // TODO:  Add FAQ.SaveViewState implementation
                  if (_viewState != null)
                  {
                        return ((IStateManager)_viewState).SaveViewState();
                  }
                  return null;
            }

            void IStateManager.LoadViewState(object savedState)
            {
                  // TODO:  Add FAQ.LoadViewState implementation
                  if(savedState != null)
                  {
                        ((IStateManager)ViewState).LoadViewState(savedState);
                  }
            }

            #endregion

0
Comment
Question by:devaid
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5 Comments
 
LVL 18

Expert Comment

by:testn
ID: 9882243
Actually you should nnot have to override anything. It should work out of the box.....
Can you post your code? I think there might be something wrong.
0
 
LVL 2

Author Comment

by:devaid
ID: 9882521
The override was a stab in the dark as I couldn't get it to work.
The code just generates 3 textboxes with some table layouts and text.
0
 
LVL 2

Author Comment

by:devaid
ID: 9882762
Ah ha,
figured out why.

I'm creating the objects at runtime like this:

CustControl = myCustC = new CustControl (3);

So at runtime it creates an instance on each postback thus not ViewState Data.
Any ways around this? --- Increased points from 250 to 500
0
 
LVL 18

Accepted Solution

by:
testn earned 2000 total points
ID: 9884211
Absolutely,

instead of create your control in Page_Load. You should create your control in CreateChildControls instead.

override protected void CreateChildControls() {
    CustControl = myCustC = new CustControl (3);
    ...
    this.Controls.Add(CustControl);
}

private void Page_Load(object sender, EventArgs e) {
    EnsureChildControls();
    ... do you stuff here
}

0

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