BUG: Objects Disappear After Being Assigned to Custom Properties (232093)


The information in this article applies to:

  • Microsoft Visual FoxPro for Windows 6.0
This article was previously published under Q232093

SYMPTOMS

If you use the Assign method, when creating an object and the following code is fired three or more times, the object that is being assigned to the property disappears from memory: 
   propertyname = THIS

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

MORE INFORMATION

After assigning an object to a property using the THIS reference, the property will then share the same properties, methods, and events as the object. After assigning the THIS reference to the property three or more times, the object is removed from memory and the value of the property returns to a null value. If the Assign method is not used when the property is created, an object can be assigned to the property repeatedly without being removed from memory.

WORKAROUND

By assigning the property back to null before assigning the value of the object to it, the object will not disappear. For example: 
 propertyname = NULL
 propertyname = THIS

Steps to Reproduce Behavior

  1. Create a form and add a New property named MyProp to the form. Next, select the Assign method check box.
  2. Add a command button and place the following code in Click event of the command button: 
       ThisForm.MyProp = THIS
  3. Run the form and click the command button numerous times. Note that the command button disappears from the form.
Modification Type:MajorLast Reviewed:10/16/2002
Keywords:kbBug kbContainer kbCtrl kbOOP KB232093
©2002 Microsoft Corporation. All rights reserved.