Linq中的类似运算符（用于整数）

Question

In Linq we use the like operator for strings

var query = from c in ctx.Customers
            where c.City.StartsWith("L") && c.City.Contains("n")
            select c

Is it Possible to apply like operator in linq for integers.

please help me.

Answer 1

No. You'd have to cast to string first (see the answer here also: Problem with converting int to string in Linq to entities ).

In SQL it would be something like

DECLARE @StartsWith NVARCHAR
SET @StartsWith = '1'

SELECT * FROM Customers
WHERE (CAST CustomerId AS NVARCHAR(MAX)) LIKE @StartsWith + '%'

I guess this should work in LINQ:

var query = from c in ctx.Customers
            where SqlFunctions.StringConvert((Decimal)c.CustomerId).Startswith("1")
            select c;

note that this will be a slow query if you have a large table, as it will need to do a table scan (any index on the int column would not be used).

Answer 2

.Contains（“ / Integer /”））也可以使用.StartsWith（）或.EndsWith（）。

Answer 3

You can convert your integer field to a string, and then use SqlMethods.Like :

var query = from c in ctx.Customers
            where SqlMethods.Like(c.IntegerPhoneNumber.ToString(), "555*")
            select c