How to add strings elements in the list property of a class

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model :

C#

public class hello
{
    public list<string> mobilenumbers {get;set;}
    public string name {get;set;}
}

controller :

C#

string user = (string)Tempdata["user"]
var result =db.tblname.Where(em=>em.name==user).ToList()
list<hello> lst = new list<hello>;
foreach(var item in result)
{
   hello obj = new hello();
   obj.name = item.name;
   var mobile = db.tblmobile.where(em=>em.name==item.name).ToList();
   foreach(var item1 in mobile)
   {
    obj.mobile.Add(item1.mobile); 
   }
}

What I have tried:

it is throwing null reference when adding mobile numbers . is there a easy way to get these multiple numbers for a single name user.

Posted 19-Apr-16 0:14am

Himaan Singh

Updated 19-Apr-16 0:41am

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Karthik_Mahalingam · Answer 1 · 2016-04-19T00:21:00

Solution 1

Check for Null value in the collection

C#

 if(result !=null)
foreach(var item in result)

C#

if(mobile!=null)
 foreach(var item1 in mobile)

Posted 19-Apr-16 0:21am

Karthik_Mahalingam

F-ES Sitecore · Answer 2 · 2016-04-19T00:41:00

Your hello class has a property mobilenumbers but the code is using mobile so it won't even compile, I assume this is a typo? Where you try and add the mobile number if you use the debugger you'll see that obj.mobilenumbers is null so you can't call any methods on it like "add". Objects like Lists etc only exist when you create them, so you need to create the list before you use it

C#

string user = (string)Tempdata["user"]
var result =db.tblname.Where(em=>em.name==user).ToList()
list<hello> lst = new list<hello>;
foreach(var item in result)
{
   hello obj = new hello();
    // create the list before you can use it
   obj.mobilenumbers = new List<string>();
   obj.name = item.name;
   var mobile = db.tblmobile.where(em=>em.name==item.name).ToList();
   foreach(var item1 in mobile)
   {
    obj.mobilenumbers.Add(item1.mobile); 
   }
}