Can anyone help? Thank in advance

Question

3.00/5 (1 vote)

See more:

while running it gives exception like below:

C#

LINQ to Entities does not recognize the method 'Int32 Parse(System.String)' method, and this method cannot be translated into a store expression.

What I have tried:

C#

demo db = (from c in ob.demoes
                       where c.id ==Convert.ToInt32(txtboxId)
                       select c).FirstOrDefault();
            db.name = txtboxName.Text;
            db.salary = int.Parse(txtboxSalary.Text);
            ob.SaveChanges();

Posted 21-Dec-16 1:19am

Member 12821006

Updated 21-Dec-16 1:37am

Add a Solution

1 solution

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)

OriginalGriff · Accepted Answer · 2016-12-21T01:37:00

Try doing the conversion first:

C#

int id = Convert.ToInt32(txtboxId);
demo db = (from c in ob.demoes
           where c.id == id
           select c).FirstOrDefault();
db.name = txtboxName.Text;
db.salary = int.Parse(txtboxSalary.Text);
ob.SaveChanges();

But it should be unnecessary. Certainly, it works fine in normal Linq:

C#

int id = 66;
string sid = "66";
List<MyClass> list = new List<MyClass>();
MyClass mc = new MyClass();
mc.id = 55;
list.Add(mc);
mc = new MyClass();
mc.id = 66;
list.Add(mc);
var x = (from c in list
        where c.id == id
        select c).FirstOrDefault();
var y = (from c in list
         where c.id == Convert.ToInt32(sid)
         select c).FirstOrDefault();

Compiles and runs fine, and x and y both contain the same instance.