Assign value to a member of a inner class

Question

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I have created a class file exclass.cs which has 2 classes exclass and exMember.

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PModels
{
    public class exclass
    {
        public string classId { get; set; }
        public string clientId { get; set; }
        public string clientName { get; set; }
        public string divisionId { get; set; }

        public List<exMember> memberships1 { get; set; } = new List<exMember>();
    }
    public class exMember
    {
      
        public string consumerId { get; set; }
      




    }
}

I want to assign value to consumerID, which is inside exMember class. It is giving NullReference error when I assign value.

What I have tried:

C#

public exclass SearchMember()
       {
           List<exclass> memberInfo = new List<exclass>();
           try
           {
               exclass vm = new exclass();
               vm.classId = "009";
               vm.clientId = "444";
               vm.clientName = "abc";
               vm.divisionId = "008";
                vm.memberships1[0].consumerId = "23456";

               memberInfo.Add(vm);



           }
           catch(Exception ex)
           {
               MessageBox.Show(ex.ToString());
               return null;
           }



       }

Posted 2-Sep-20 20:40pm

Member 10711706

Updated 2-Sep-20 21:22pm

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2 solutions

Solution 2

You forgot to create an instance of the exMember class.
Change from

Quote:
vm.divisionId = "008";
vm.memberships1[0].consumerId = "23456";

to

C#

vm.divisionId = "008";
vm.memberships1.Add(new exMember());
vm.memberships1[0].consumerId = "23456";

Posted 2-Sep-20 21:22pm

CPallini

Comments

Maciej Los 3-Sep-20 3:24am

Different way to achieve the same ;)
5ed!

Member 10711706 3-Sep-20 3:36am

Even this throws System Null Reference Exception

F-ES Sitecore 3-Sep-20 7:10am

You keep saying it throws an exception, that information isn't enough for anyone to help you. You have to say which line threw the exception. The above snippet worked ok for me.

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Maciej Los · Accepted Answer · 2020-09-02T21:09:00

Solution 1

Instead of this:

C#

vm.memberships1[0].consumerId = "23456";

Use this:

C#

vm.memberships1.Add(new exMember(){consumerId="23456"});

Note: memberships1 list has been initiated but it's empty (does not have any element). So, when you try to refer to the first element on the list, it causes ArgumentOutOfRangeException (NOT a NullReferenceException!!!).

BTW: Why clientId and consumerId is type of string? For numbers you should use proper data type!

Posted 2-Sep-20 21:09pm

Maciej Los

Updated 2-Sep-20 21:25pm

v3

Comments

CPallini 3-Sep-20 3:22am

5.

Maciej Los 3-Sep-20 3:24am

Thank you, Carlo.

Member 10711706 3-Sep-20 3:36am

Even this throws System Null Reference Exception

Maciej Los 3-Sep-20 3:41am

In which line? What is complete error message?

Please, refer this: c# - What is a NullReferenceException, and how do I fix it? - Stack Overflow[^]

Member 10711706 3-Sep-20 3:45am

vm.memberships1.Add(new exMember(){consumerId="23456"}); for this

Richard Deeming 3-Sep-20 5:25am

That would suggest you haven't initialized the memberships1 property. Which would mean the code you're running is not the code you posted in your question.

Maciej Los 3-Sep-20 5:39am

Good point!

Richard Deeming 3-Sep-20 5:28am

NB: A simpler way to create the objects would be:

List<exclass> memberInfo = new List<exclass>
{
    new exclass
    {
        classId = "009",
        clientId = "444",
        clientName = "abc",
        divisionId = "008",
        memberships1 = new List<exMember>
        {
            new exMember
            {
                consumerId = "23456",
            },
        },
    },
};

Maciej Los 3-Sep-20 5:38am

My virtual 5!

Member 10711706 3-Sep-20 3:45am

System.NullRefernceException: Object reference not set to an instance of an object

Maciej Los 3-Sep-20 3:47am

Need more details! Copy and paste complete error message (with details).

Member 10711706 3-Sep-20 3:51am

Complete error is--System.NullRefernceException: Object reference not set to an instance of an object

Maciej Los 3-Sep-20 4:05am

No, it's not complete error message. There must be provided a source of that error.