Changes not reflecting in WebPart

Question

In sharepoint2010 I am using a webpart and custom toolpart[]. The following code is for toolpart array

public override Microsoft.SharePoint.WebPartPages.ToolPart[] GetToolParts()
        {
            ToolPart[] tp = new ToolPart[3];
            WebPartToolPart wptp = new WebPartToolPart();
            CustomPropertyToolPart cptp = new CustomPropertyToolPart();
            SampleToolPart customTP = new SampleToolPart();
            tp[0] = customTP;
            tp[1] = cptp;
            tp[2] = wptp;

            return tp;
        }

When I edit the webpart user can configure data to be shown in the webpart page. But I am not able to view the recent changes in the page after clicking apply and Ok only the modified data is shown in the page. In the CreateChildControls() event only I have added the controls in it.

Could anyone help me to solve this issue ?

Answer 1

This is probably due to your misunderstanding of the ASP.NET Page Life cyle.

Long long story short it goes through these events (simplified)

• Constructor
• OnInit
• OnLoad
• CreateChildControls
• Apply Changes
• OnPreRender
• Render

I suspect (not all code posted) that you're creating your controls AND setting their values in CreateChildControls.

However, the ApplyChanges method (where you pick up changes in the toolpart) happens at OnPreRender.

In other words you've already set what you're going to be sending back to theuser before you pick up any changes.

Setup some breakpoints in the relevant sections and try it out.

How to fix?

• Create controls in normal place but don't set their value until OnPreRender/OnRender.
• Or if you've got complex controls (i.e. settings on toolpart changes what controls you need to create) then you can remove the existing controls you just created and re-create them after OnApply.

See also

• SharePoint web part lifecycle events
• MSDN - ASP.NET web parts lifecycle
• MSDN - ASP.NET page life cycle overview