ctrl is IValidator 如题

[nanlu123]

private void ShowPanel(Panel panel, bool visible)
{
IValidator validator;

foreach (Control ctrl in panel.Controls)
{
//check to see if its a validator
if ( ctrl is IValidator)
{
validator = (IValidator)ctrl;
ctrl.Visible = visible;
if (!visible)
{
validator.Validate();
}
}
}
panel.Visible = visible;
}


问题一 ctrl is IValidator 可以这么写吗？

[Knight94]

to 问题一 ctrl is IValidator 可以这么写吗？

不可以。
比较合理的写法如下。
validator = ctrl as IValidator;
if ( validator != null )
{
//Handle it here
}