Question

I have multiple line condition for order by as below

if (enum1)
{
     var = itemlist.orderby(r => r.column1)
}
else if (emum2)
{
     var = itemlist.orderby(r => r.column2)
}

And so on.. Any way to do such thing dynamically.

Answer 1

What you can do is to better manage the column selection for sorting, e.g. using some collection that holds the Func<> for KeySelector.

E.g. if you have a class name ‘SomeDTO’ with four properties, Prop1,2,3 and 4. And four corresponding enum members.

var searchByMapping = new Dictionary<SearchByEnum,Func<SomeDTO, object>>();
searchByMapping.Add(SearchByEnum.Prop1, x => x.Prop1);
searchByMapping.Add(SearchByEnum.Prop2, x => x.Prop2);
searchByMapping.Add(SearchByEnum.Prop3, x => x.Prop3);

coll = coll.OrderBy(searchByMapping[searchByEnumParam]).ToList();

This is a not so dynamic approach but a typesafe one.