c# add item to list in object in list of objects

Question

I've tried to work like: this one

Got an object class:

class Letter
{
    public char letter {get; set;}
    public List<int> posities { get; set; }

    public Letter()
    {
        posities = new List<int>();
    }
    
}

and want to add an int to the positions list by:

 letters.Add(new Letter
            {
                letter = a,
                posities.Add(i)                   
            });

But can't get it working, what am I doing wrong?? (btw: the letter a is added like expected, the problem is with adding the positie i).

Please share a minimal reproducible example. Also read learn.microsoft.com/en-us/dotnet/csharp/programming-guide/… . — mjwills
– mjwills, Commented Jul 17, 2021 at 13:44
"But can't get it working" Why not, what is the problem or the error? — Tim Schmelter
– Tim Schmelter, Commented Jul 17, 2021 at 13:44
@TimSchmelter it says: "The name posities does not exist in the current context. Invalid initializer member declarator" — Goodquestion
– Goodquestion, Commented Jul 17, 2021 at 13:51
but wanted to keep it a minimal reproducible example. Minimal, perhaps. Reproducible - definitely not. — mjwills
– mjwills, Commented Jul 17, 2021 at 13:55

Serge · Accepted Answer · 2021-07-17 14:12:29Z

3

you have to use = to assign something when you use an object initializers - you can only set properties or fields, rather than call methods.

void Main()
{
    var a='a';
    var i=1;
    var letters = new List<Letter>();
    letters.Add(new Letter
    {
        letter = a,
        posities = new List<int> { i }
    });
    
}

otherwise maybe you will have to create a special constructor


    public Letter(char letter, int i)
    {
        letter=a;
        posities = new List<int> {i};
    }

edited Jul 17, 2021 at 14:12

answered Jul 17, 2021 at 14:06

Serge

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Comments

Goodquestion · Accepted Answer · 2021-07-17 13:59:09Z

0

don't know why but this IS working:

letters.Add(new Letter
            {
                letter = a,                
            });

            letters[0].posities.Add(i);

answered Jul 17, 2021 at 13:59

Goodquestion

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Comments

Ozan ERTÜRK · Accepted Answer · 2021-07-17 14:20:04Z

-1

Lets rewrite your last code in order to clarify

var a = 'c';
var i = 0;
var letters = new List<Letter>(); 
var letter = new Letter();//Letter's constructor called and posties list initialized after that you can access posties member functions, like 'Add'
letter = a;
letter.posties.Add(i);
letters.Add(letter);

There are too many ways to write code, try to stay clear and do not put all the eggs in the same basket.

answered Jul 17, 2021 at 14:20

Ozan ERTÜRK

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