like operator in linq c# for integer field

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i want like operator for interger field,then i am using this code

var details = db.RecipientDescriptions.Where(o =>o.ID.ToString().Contains("67")).ToList();

but i am getting the error

LINQ to Entities does not recognize the method 'System.String ToString()' method, and this method cannot be translated into a store expression.

any solutions please?

Posted 12-Aug-13 1:04am

Usha Sanjee

Updated 19-Jun-20 20:22pm

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[no name] 12-Aug-13 7:13am

"any solutions please", sure.... don't call ToString on a string. It's a string already so there is no need to convert it to a string.

Usha Sanjee 12-Aug-13 7:34am

ID is an integer field

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Fredrik Bornander · Answer 1 · 2013-08-12T01:45:00

As the expression past to a LINQ to Entities query is run on the DB you've restricted in what you can pass. Since ToString is just a method that can do anything there's no way for the DB to guarantee the result.

What you can do if your unfiltered result set isn't too large is to apply the Where clause after the expression has been run;

C#

db.RecipientDescriptions.ToList().Where(o =>o.ID.ToString().Contains("67").ToList();

On a more general note I would say that if you have a need to do contains on a value then that value shouldn't be of type integer.

Hope this helps,
Fredrik

Stephen Hewison · Answer 2 · 2013-08-12T01:37:00

Solution 1

Copied from:

LINQ to Entities does not recognize the method 'System.String ToString()' method[^]

use can use something like this,

C#

where userIds.Contains(SqlFunctions.StringConvert((double)user.Id))
instead of where userIds.Contains(user.Id.ToString())

Posted 12-Aug-13 1:37am

Stephen Hewison

*Suvabrata Roy* · Answer 3 · 2013-08-12T01:38:00

Solution 2

Hi,

Actually you are using LINQ to Sql so those objects are IQueryable so there is no ToString() method.

you can try this :

var details = db.RecipientDescriptions.Where(o =>SqlMethods.Like(o.ID, "67%")).ToList();

Posted 12-Aug-13 1:38am

Suvabrata Roy

Member 14868286 · Answer 4 · 2020-06-19T20:23:00

You can use Contains in Linq for Like.
If it's an integer value you need to use

AsEnumerable()

and

"~~"

string strInvoiceNum = "~~800~~8999~~9000-~~9010~~";

var vdbInvoiceExist = (from row in Db.InvcHead.AsEnumerable()
                        where row.Company == callContextClient.CurrentCompany
                        && strInvoiceNum.Contains("~~" + row.InvoiceNum + "~~")
                        select row);

If it's an string

string strCustID = "~~Addis~~BARRISTON~~CLARKEo~~ECD-~~";
vdbCustomerExist = (from row in Db.Customer
            where row.Company == callContextClient.CurrentCompany && strCustID.Contains("~~" + row.CustID + "~~")
            select row);

like operator in linq c# for integer field

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