如何在 DevExpress Grid 中使用空字符串而不是 null 分配字符串项

Question

I need to set the string item value to "empty string" and not to null by pressing DEL when editing a devexpress grid.

Answer 1

On the event getDisplayText of your column you can add

Procedure <youtview>.YourColumnGetDisplayText(Sender: TcxCustomGridTableItem; ARecord: TcxCustomGridRecord; var AText: string);
begin
 if AText = '' then
   AText := 'empty string';
end;

Answer 2

It's been a couple of years since I've seen Delphi, but there are events triggered on each item within a devexpress grid. Identify the 'OnKeyUp' event or similar, and add a method to identify the key pressed. If it is the DEL key, set the text value to ''.

The Delete key is VK_DELETE. Here is a list of other virtual keys for Delphi as well: http://delphi.about.com/od/objectpascalide/l/blvkc.htm