/// <inheritdoc />
protected override void OnParametersSet()
{
// We have to do a bit of pre-processing on the lambda expression. Only do that if it's new or changed.
if (_lastAssignedProperty != Property)
{
_lastAssignedProperty = Property;
var compiledPropertyExpression = Property.Compile();
if (!string.IsNullOrEmpty(Format))
{
// TODO: Consider using reflection to avoid having to box every value just to call IFormattable.ToString
// For example, define a method "string Format<U>(Func<TGridItem, U> property) where U: IFormattable", and
// then construct the closed type here with U=TProp when we know TProp implements IFormattable
// If the type is nullable, we're interested in formatting the underlying type
var nullableUnderlyingTypeOrNull = Nullable.GetUnderlyingType(typeof(TProp));
if (!typeof(IFormattable).IsAssignableFrom(nullableUnderlyingTypeOrNull ?? typeof(TProp)))
{
throw new InvalidOperationException($"A '{nameof(Format)}' parameter was supplied, but the type '{typeof(TProp)}' does not implement '{typeof(IFormattable)}'.");
}
_cellTextFunc = item => ((IFormattable?)compiledPropertyExpression !(item))?.ToString(Format, null);
}
else
{
_cellTextFunc = item => compiledPropertyExpression !(item)?.ToString();
}
_sortBuilder = GridSort <TGridItem> .ByAscending(Property);
}
if (Title is null && Property.Body is MemberExpression memberExpression)
{
Title = memberExpression.Member.Name;
}
}