error: cannot implicitly convert type 'string' to 'int?'

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Hey guys,
I am trying yo build the following class for which i get an error on the line this.id = e.id as cannot implicitly convert type 'string' to 'int?'.

many many Thanks,
Chetan.

C#

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;
using System.Text;
using System.Runtime.Serialization;
using HsInternet.Data.DAL;

namespace HsInternet.Data.BLL
{
    public class Baby
    {
        public int id { get; set; }
        public string name { get; set; }
        public string parents { get; set; }
        public int gender { get; set; }
        public string weight { get; set; }
        public string length { get; set; }
        public DateTime date { get; set; }
        public DateTime time { get; set; }
        public string image { get; set; }
        public string ipa { get; set; }
        public string ipb { get; set; }


        public Baby()
        {
            this.id = -1;
            this.name = string.Empty;
            this.parents = string.Empty;
            this.gender = -1;
            this.weight = string.Empty;
            this.length = string.Empty;
            this.date = DateTime.Now;
            this.time = DateTime.Now;
            this.image = string.Empty;
            this.ipa = string.Empty;
            this.ipb = string.Empty;
        }

        public Baby(Data.DAL.Baby e)
        {
            this.id = e.id;     //getting error on this line
            this.name = e.name;
            this.parents = e.parents;
            this.gender = e.gender;
            this.weight = e.weight;
            this.length = e.length;
            this.date = e.date;
            this.time = e.time;
            this.image = e.image;
            this.ipa = e.ipa;
            this.ipb = e.ipb;
        }

        public static void Parse(DAL.Baby e, Baby t)
        {
            e.id = t.id;

Posted 13-Sep-10 3:32am

cnjadhav

Updated 13-Sep-10 4:02am

Dalek Dave

v2

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4 solutions

Solution 4

You have mentioned, below line is throwing error.

public Baby(Data.DAL.Baby e)
{    this.id = e.id;     //getting error on this line

this.Id, represent the current object, which is int. Now what is the type of Data.DAL.Baby.Id ? Is it string ? and what value currenly hold by e.id ?

Put a brekpoint and check. Let us know,if it does not solve your issue.

Posted 13-Sep-10 4:16am

Abhijit Jana

Solution 3

Well, you can ensure that the id is really an int. However, if you just want a quick and dirty way to remove the error. Try this out!

this.id = int.Parse( e.id.ToString());

If it's already a String, the ToString() call should not matter.

Posted 13-Sep-10 4:06am

Ruselo Riva Asentista

Comments

Abhijit Jana 13-Sep-10 10:12am

int.Parse() will throw an exception, if the input is not valid, like int.Parse("a12") will throw an exception. So, it always better to use TryParse(), which will throw bool based on seccess and failure.

Ruselo Riva Asentista 13-Sep-10 11:09am

I think I should throw an exception because otherwise, you could get an object without an id but with a name, etc. This could be a security threat. It's always better to terminate gracefully than to continue executing out of control. That said, I also use TryParse but only when I have default values like quantities. I never use it on ids or any other navigation / identification properties.

Abhijit Jana 13-Sep-10 11:21am

Yeah.

Member 14482462 21-Jun-19 10:04am

Cannot implicitly convert type `string' to `int'
CapitalTooll Tools = new CapitalTooll();
var lastentry = db.CapitalToolls.OrderByDescending(c => c.ItemMasterNo).FirstOrDefault();
if (id != 0)
{
Tools = db.CapitalToolls.Where(x => x.ItemMasterNo == id).FirstOrDefault<capitaltooll>();
}
else if (lastentry == null)
{
Tools.ItemMasterNo = "CAP 0001";
}
else
{
Tools.ItemMasterNo = "CAP" + (Convert.ToInt32(lastentry.ItemMasterNo.ToString(9, lastentry.ItemMasterNo.Length - 9)) + 1).ToString(D3);
}
return View(Tools);

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sureshbalachander · Accepted Answer · 2010-09-13T03:38:00

Solution 1

Hi,

Make sure that the "e.id" is an integer variable.
This error occurs because, you are trying to assign a string value "e.id" to integer value "this.id".

If your "e.id" contains integer value, then try,

this.id = Convert.ToInt32(e.id)

Regards,
Suresh

Posted 13-Sep-10 3:38am

sureshbalachander

Hiren solanki · Accepted Answer · 2010-09-13T03:58:00

Solution 2

Please Clarify Which Error you are Getting.

cannot implicitly convert type 'string' to 'int?'.
or
cannot implicitly convert type 'string' to 'int'.

Because the First Error relates to Nullable Int.

and Second Error Seems Like Data Conversion problem.

Thanks,

Posted 13-Sep-10 3:58am

Hiren solanki

Comments

cnjadhav 13-Sep-10 10:02am

Hey Hiren,
the first one is my error, cannot implicitly convert type 'string' to 'int?'.

thanks
Chetan.

Hiren solanki 13-Sep-10 10:04am

Check the value is null of id variable ?

cnjadhav 16-Sep-10 9:49am

Reason for my vote of 5
Automatic vote of 5 for accepting answer.