从TCheckListBox到TcxCheckListBox有一个例外?
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26-09-2019 - |
题
我使用此代码与TCheckListbox(lbServices)并能正常工作。但是,随着从TcxCheckListBox它DevExpress的提高异常。
procedure TMaintenanceForm.AfterConstruction;
var
i: Integer;
ActionObj: TAction;
begin
inherited;
for i := 0 to ServiceActionList.ActionCount-1 do
begin
ActionObj := ServiceActionList.Actions[i] as TAction;
lbServices.Items.AddObject(ActionObj.Caption, ActionObj);
end;
end;
procedure TMaintenanceForm.btnStopClick(Sender: TObject);
begin
fContinue := False;
end;
procedure TMaintenanceForm.cmdExecuteSelectedClick(Sender: TObject);
var
i: Integer;
begin
Screen.Cursor := crHourGlass;
try
for i := 0 to lbServices.Count -1 do
if lbServices.Selected[i] then
(lbServices.Items.Objects[i] as TAction).Execute; // Exception here!!!!
finally
Screen.Cursor := crDefault;
end;
end;
如果我调试代码lbServices.Count = 12。 lbServices.Items.Objects [i]是列表中的所有项目为零。这里有什么问题?
解决方案
使用以下代码来代替:
var
AItem: TcxCheckListBoxItem;
begin
AItem := cxCheckListBox1.Items.Add;
AItem.ItemObject := Action1;
AItem.Text := Action1.Caption;
end;
...
var
I: Integer;
begin
for I := 0 to cxCheckListBox1.Items.Count - 1 do
if cxCheckListBox1.Items[I].Checked then
(cxCheckListBox1.Items[I].ItemObject as TACtion).Execute;
end;
其他提示
没有<强>对象强> TcxCheckListBox.Items的属性
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