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TOPIC: Property or indexer '__Usual.Value' cannot be assigned to -- it is read only

Property or indexer '__Usual.Value' cannot be assigned to -- it is read only 2 years 4 months ago #1

  • ArneOrtlinghaus
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The following statement with an untyped variable gives the error above
function ControlSetNullValue (oControl , oDB )
..
oControl:Value := false

It seems that the access Value has a special meaning for usuals. Unfortunately it gives conflicts with the control class of the GUI classes.

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Property or indexer '__Usual.Value' cannot be assigned to -- it is read only 2 years 4 months ago #2

Hi Arne,

That was fixed about a week ago :-)

Chris
XSharp Development Team
chris(at)xsharp.eu

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Property or indexer '__Usual.Value' cannot be assigned to -- it is read only 2 years 4 months ago #3

Arne,
The problem here was that the Usual structure also has a (read only) Value property.
This property returns the contents of the Usual (as an object).

Robert
XSharp Development Team
The Netherlands
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Property or indexer '__Usual.Value' cannot be assigned to -- it is read only 2 years 4 months ago #4

The fastest fix is
function ControlSetNullValue (guiControl AS Control , db AS ??? ) AS VOID

guiControl:Value := false

I would do this immediatly after reporting the bug, you know.

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Property or indexer '__Usual.Value' cannot be assigned to -- it is read only 2 years 4 months ago #5

  • ArneOrtlinghaus
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Hi Frank,
thank you for the idea.
Unfortunately there are many untyped functions existing and I cannot change them in a simple way. Often the functions are called with different parameters and with different number of parameters, and this not hardcoded to be able to find compiling, but also in macros at customer sites.

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Property or indexer '__Usual.Value' cannot be assigned to -- it is read only 2 years 4 months ago #6

just start doing it whenever you stumble over an issue like this. And of course whenever you see an untyped function/method. Even the longest way starts with the first step.
Permanent refactoring things like this takes an important amount of time in my work since the early 90ies.

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