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Valentina
543
WinGrid cell validation
posted
Hi,
in my application I use a WinGrid to collect informations about a set of properties. The grid has two columns, one for the name of the properties, and the other for the values. So, each row in the grid represents a single property. Depending on property type and attributes, the cell holding value has a particular style and editor (ColumnStyle.Double, ColumnStyle.Date, ColumnStyle.DropDown, ...).

I would like to set a max length for text-type properties, but unfortunately it seems to be a column-only attribute. So I have to make a little validation on my fields, but I can't find a pretty solution to the following questions:

- which is the best event I can use to trap all changes to my value fields? Now I'm using 'BeforeCellUpdate', but it doesn't allow me to force the cursor to remain in the not-validating cell. So I tried to use 'BeforeExitEditMode', but it doesn't fire on DropDown fields...

- how can I replace the value that doesn't validate (value too long, for example) with a correct value (the same value, trimmed, for example), in which event? I tried to set a new value to the cell in 'BeforeCellUpdate', but it raises an exception:
"Value property can not be assigned while BeforeCellUpdate event is in progress".

Please let me know if I'm missing something... :)

Thank you for your time,
Valentina
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  • 37774
    Verified Answer
    posted

    Valentina,

    Generally the BeforeExitEditMode event is the best place to perform this logic since you can prevent the user from moving to another cell until a valid value is entered.  This isn't firing after a DropDown is closed because at this point the cell would still be in edit mode; you could use the AfterCellListCloseUp if you need to immediately perform logic here.

    As for setting a new value on a cell, it would make sense that you can't assign a value in the BeforeCellUpdate since this would cause a recursive situation.  You could likely update the value in the BeforeExitEditMode event as well.

    -Matt

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