String to string and still getting error "cannot convert from 'string' to 'int'"

Question

I need help understanding why my program is throwing this error:

Cannot convert from 'string' to 'int'

when both list and tVal are strings.

I am getting this error at

List<string> testitems = new List<string>(tVal);

Please advise.

abc is an int array with some random numbers.

static void Main()
{
    string tVal = "";

    List<int> result = new List<int>();

    for (int i = 0; i < abc.Length; i++)
    {
        if (abc[i] == 7)
        {
            result.Add(0);
            i++;
        }
        else
        {
            result.Add(abc[i]);
        }

        foreach (var item in result)
        {
            tVal += item.ToString();
        }                            
    }

    List<string> testitems = new List<string>(tVal);
    //more code
}

You are calling this constructor overload. Apparently you meant new List<string>() { tVal };. — GSerg
– GSerg, Commented Jun 6, 2020 at 19:04

charbel · Accepted Answer · 2020-06-06 19:07:51Z

3

To add objects to a list you can use:

List<string> testitems = new List<string>() { tVal };  //(like @GSerg suggested in the comments)

Or:

List<string> testitems = new List<string>();
testitems.Add(tVal);

answered Jun 6, 2020 at 19:07

charbel

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Comments

Marci · Accepted Answer · 2020-06-06 19:13:00Z

2

Put the tVal into a curly brackets , like this:

List<string> testitems = new List<string>() { tVal };

Official documentation for lists: https://learn.microsoft.com/en-us/dotnet/api/system.collections.generic.list-1?view=netcore-3.1

answered Jun 6, 2020 at 19:13

Marci

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Comments

Christopher · Accepted Answer · 2020-06-06 19:24:51Z

1

new List<string>(tVal)

You handed tVal in as the 1st constructor argument. The closest match the compiler can find is List<T>(Int32). Wich has a string -> Int conversion that is not valid.

This is not the way to initialize a collection! You can either:

use the constructor that can take just about any generic collection as input (List<T>(IEnumerable<T>))
Add the single element manually after creating the list (charbels solution)
use the collection initializer syntax (as shown by Marci)

answered Jun 6, 2020 at 19:24

Christopher

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