Question

I want to compare string which is date. I am trying following linq query, but I get operators can be applied to operands of type string to string.

    var descriptions = 
        from a in db.Descriptions 
        where a.ID == 12  
        && a.arrivalDate >= "20110101000000" 
        && a.arrivalDate <= "20110131000000" 
        select a; 

Any ideas?

Answer 1

You cannot compare a DateTime variable with a String variable.

So you need to create a DateTime first:

String str1 = "20110101000000";
String str2 = "20110131000000";
String format = "yyyyMMddhhmmss";
DateTime d1 = DateTime.ParseExact(str1, format,null);
DateTime d2 = DateTime.ParseExact(str2, format, null);

and the LINQ query:

var descriptions = 
    from a in db.Descriptions
    let arrivalDate = DateTime.ParseExact(a.arrivalDate, format,null)
    where a.ID == 12  
    && arrivalDate  >= date1
    && arrivalDate  <= date2
    select a;