将字符串数组解析/转换为 int

Question

I want to make summations in certain columns, initially I found a referral as follows

then because I use one string in one column then I change the array from int to string as follows

string[,] a = {     
                    {"name song 1", 2},  
                    {"name song 2", 5},  
                    {"name song 3", 8}  
               };

then I run but an error appears

error CS0029: Cannot implicitly convert type int' to string'

I have tried this Convert string[] to int[] in one line of code using LINQ

because I was just learning this language I couldn't implement it please help me thanks

Answer 1

It seems that you want to store key-value pairs, this can be done using a Dictionary. Checkout the following example:

var scoreBySong = new Dictionary<string, int> {
  {"name song 1", 2},  
  {"name song 2", 5},  
  {"name song 3", 8}  
}

Answer 2

I'd prefer to use dictionary in this case, but it might be handy for you to know as well that you can store values of different types using the object type. Later you'll have to do type conversion to use math operations

object[,] a = 
{
    {"name song 1", 2},
    {"name song 2", 5},
    {"name song 3", 8}
};

var sum = 0;

for (int i = 0; i < a.GetLength(0); i++)
{
    sum += Convert.ToInt32(a[i, 1]);
}

Console.WriteLine(sum);

If you are familiar with classes, you could reorganize your multi-dimensional array into single-dimensional, which makes code way more readable.

This approach is better than the previous one or the one that uses dictionary, since you'll have to modify less code when Song class extends into more properties

public class Song
{
    public string Name { get; set; }

    public int Value { get; set; }
}

class Program
{
    static void Main(string[] args)
    {
        Song[] a =
        {
            new Song() { Name ="name song 1", Value = 2 },
            new Song() { Name ="name song 2", Value = 5 },
            new Song() { Name ="name song 3", Value = 8 },
        };

        var sum = 0;

        for (var i = 0; i < a.Length; i++)
        {
            sum += a[i].Value;
        }

        Console.WriteLine(sum);
    }
}