System.notsupportedexception: 'LINQ to entities does not recognize the method 'int32 toint32(system.string)' method, and this method cannot be translated into a store expression.'

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System.NotSupportedException: 'LINQ to Entities does not recognize the method 'Int32 ToInt32(System.String)' method, and this method cannot be translated into a store expression.'

i want to get the UserId whose otp match with the opt enter by the user.

What I have tried:

public JsonResult VerifyOTP(string otp)
{
using (var db = new OfficeEntities())
{
Account account = new Account();
var num=(int.Parse(otp));

db.Accounts.Where(x => x.Otp == num).Select(x => x.UserId).SingleOrDefault();

if (account == null) {
return Json(false);
}
account.IsActive = true;
db.Entry(account).State = System.Data.Entity.EntityState.Modified;
db.SaveChanges();
return Json(true);

}

Posted 23-Aug-19 1:08am

Member 14552976

Updated 23-Aug-19 21:13pm

v3

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phil.o 23-Aug-19 7:12am

The code-block you provided and the error message do not match; in your code, search for a method called ToInt32 accepting a string as argument and returning an integer. When you find it, you can replace it by int.Parse() or int.TryParse() method.

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Richard Deeming · Answer 1 · 2019-08-23T03:26:00

That code still makes no sense:

C#

Account account = new Account();

Declare a variable to hold an instance of the Account class, and set it to a new instance of the Account class.

C#

db.Accounts.Where(...).Select(...).SingleOrDefault();

Declare and execute a LINQ query. Throw away the result.

C#

if (account == null) { ... }

You know it's not null. You set it to a new instance of the Account class, and you've never updated it.

C#

account.IsActive = true;

You're updating a blank instance of the class, which is not connected to your database.

C#

db.SaveChanges();

There are no changes to save, because you have not changed any entities connected to your database.

As I mentioned in the comments to your previous question, use:

C#

Account account = db.Accounts.SingleOrDefault(...);

Combining that with Maciej's solution gives:

C#

public JsonResult VerifyOTP(int otp)
{
    using (var db = new OfficeEntities())
    {
        Account account = db.Accounts.SingleOrDefault(x => x.Otp == otp); 
        if (account == null) 
        { 
            return Json(false);
        }
        
        account.IsActive = true;
        db.SaveChanges();
        return Json(true);
    }
}