LINQ - 在最低和最高字符串之间查找

Question

I would like to find string numbers between "0000" and "9999" inside larger strings from "qwt0000abc" to "qwt9999abc".

MSSQL where id between "qwt0000abc" and "qwt9999abc"

How I would write the same LINQ query?

var selectedOrders = orders.Where(f => f.Id between "qwt0000abc" and "qwt9999abc");

Answer 1

Try this:

var selectedOrders = arr.Where(x => Regex.IsMatch(x, ".*[0-9]{4}.*"));

or this, if you need exactly qwt prefix and abc suffix.

var selectedOrders = arr.Where(x => Regex.IsMatch(x, "qwt[0-9]{4}abc"));

.* here is any literal any number of times(include zero), [0-9]{4} is digit between 0 and 9, exactly 4 digits.

Answer 2

Assuming you only want rows with that same prefix and suffix, then just replace between like this:

var selectedOrders = orders.Where(f => f.Id.CompareTo("qwt0000abc") >= 0 && f.Id.CompareTo("qwt9999abc") < 0).ToList() ;

And if this is EF you can perhaps use Like:

var selectedOrders = orders.Where(f => EF.Functions.Like(f.Id, "qwt[0-9][0-9][0-9]abc")).ToList();