Linq to Entitities Error

Question

0.00/5 (No votes)

See more:

Hello,

I am trying to fetch some values from a table called practices using Linq to Entities.

Practices table contains the following.

PracticeID AutoIncrement,
PracticeName nvarchar(10),
etc.

now i need to get 3 practices from this list.

C#

stirng [] pras = new string [] {"1", "3", "5"}

 AuthenticationEntities authEntity = new AuthenticationEntities();



                    List<practices> prac = (from p in authEntity.Practices
                                            where pras.Contains(p.PracticeID.ToString())
                                            select new Practices
                                            {
                                                Practice = p.PracticeName
                                            }).ToList<practices>();

But it is showing as error

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

Kindly help.

Posted 31-Aug-12 1:26am

Charles Shob

Updated 31-Aug-12 2:29am

AmitGajjar

v2

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Dylan Morley · Answer 1 · 2012-08-31T02:37:00

Solution 2

Why not declare the array as int type (or whatever numeric type the field is defined as)?

C#

int [] pras = new int[] {1, 3, 5};

var authEntity = new AuthenticationEntities();

var prac = (from p in authEntity.Practices
            where pras.Contains(p.PracticeID)
            select new Practices
            {
                Practice = p.PracticeName
            })
            .ToList<Practices>();

Posted 31-Aug-12 2:37am

Dylan Morley

Updated 31-Aug-12 2:38am

v2

Comments

AmitGajjar 31-Aug-12 8:41am

Correct. 5+

Charles Shob 31-Aug-12 9:53am

It is showing error.

Dylan Morley 31-Aug-12 10:02am

What is the error?

VIPR@T · Answer 2 · 2012-08-31T01:52:00

hi,

see the below example.

http://msdn.microsoft.com/en-us/vstudio/bb737939#strcont[^]

you can find the text using contains.
here your PracticeID is Integer and you are comparing it with string so there is casting problem.
i think you can`t do casting like this
i suggest use stored procedure for this.

Thanks,
Viprat Shah

**AmitGajjar** · Answer 3 · 2012-08-31T02:40:00

Solution 3

Hi,

Please have a look @ this Discussion[^]

Thanks
-Amit Gajjar

Posted 31-Aug-12 2:40am