How Do I Avoid Merged Properties in the Property Grid?

Under normal circumstances, when you select multiple controls on a Web page, the property grid for the designer, like Visual Studio .NET or the Web Matrix, shows an intersection of the properties of the controls you selected. That is, it merges the properties that exist in all the controls and shows them in the grid as one property. This is often very useful as it allows you to quickly set the properties of a lot of controls to the same values, like the font for example.

However, this is probably not useful for all the properties of your control. Properties like the ID, the Name or any other property that needs to be unique throughout your control collection, should not participate in this "merge of properties ". Preventing your property from being merged is easy though; just apply the MergablePropertyAttribute:

  /// <summary>
  /// The UserName defines the Name of the user 
  /// and needs to be unique throughout the page.
  /// </summary>
  public string UserName
      return userName;
Now when you select multiple controls that have a UserName, that property will not show up in the property grid.

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Doc ID 309
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Written by Imar Spaanjaars
Date Posted 06/29/2004 13:17
Date Last Reviewed 06/06/2006 22:32
Listened to when writing Rocket Queen by Guns N' Roses (Track 12 from the album: Appetite For Destruction)


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