Knowledge Base

PRB: Error When Properties are Evaluated at Design Time

Article ID: 191871

Article Last Modified on 8/14/1999

APPLIES TO

This article was previously published under Q191871

SYMPTOMS

Some object properties may evaluate in the design time mode and produce an error message.

CAUSE

Any variables or arrays used in these properties are not in scope.

RESOLUTION

In the following example, declare the array, myarray, Public before placing the class on the form. The following command typed in the Command window accomplishes this: 
   PUBLIC ARRAY myarray[1]

STATUS

This behavior is by design.

MORE INFORMATION

In Visual FoxPro 6.0, the Help file contains the following information about the behavior of properties in the design mode:

Note that some properties are evaluated at design time, so any memory variables or arrays used in expressions for these properties must be in scope at design time.

Steps to Reproduce Behavior

  1. Create a new visual class based on a container class.
  2. Place a list box inside a container and right-click to launch the list box builder from the popup menu.
  3. In the "Fill the list with" drop-down combo box, choose "Values from an array" and put in an array name, such as MyArray, in the Array Name text box.
  4. Save the new class and create a form.
  5. Add the new class library to the Forms Control Toolbar.
  6. Attempt to add the new class to the form.
The following error message appears:
Expression evaluated to an illegal value.

REFERENCES

Visual FoxPro 6.0 Help; search on: "Properties window"

Additional query words: kbVFp600 kbVFp500a kbVFp500 kbDesigner

Keywords: kbprb KB191871


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