C# use a string value as the name of an integer [duplicate]

Question

In the below example is it possible to use the kvp.value to point a global variable (num1, num2, num3)?

int num1;
int num2;
int num3;


private void button1_Click(object sender, EventArgs e)
{
   List<KeyValuePair<TextBox, string>> myList = new List<KeyValuePair<TextBox, string>>(); 
   myList.Add(new KeyValuePair<TextBox, string>(textBox1, "num1"));
   myList.Add(new KeyValuePair<TextBox, string>(textBox2, "num2"));
   myList.Add(new KeyValuePair<TextBox, string>(textBox3, "num3"));

          foreach (KeyValuePair<TextBox, string> kvp in myList)
          {
              TextBox tb= kvp.Key;
              try
              {
                  num1 = int.Parse(tb.Text);
                  //instead of using the hardcoded variable name num1 i want to use kvp.value
                  //kvp.value = int.Parse(tb.Text);
              }
              catch
              {
                  //blah blah
              }

          }

}

I deleted my previous post as it was very unclear, hopefully this is a bit better.

Do you need to use the variable num1, num2, num3 anywhere else in the code? — display name
– display name, Commented Dec 7, 2014 at 14:10
I would suggest a dictionary<string, int> would be more performant and provide what you want here. — kidshaw
– kidshaw, Commented Dec 7, 2014 at 14:14
You should consider using 'enum' to have a set of named integers. Best regards, — Alexander Bell
– Alexander Bell, Commented Dec 7, 2014 at 14:14

kunthet · Accepted Answer · 2014-12-07 14:48:05Z

It's easier if you can change your global variables (from int) to reference type, by introducing a wrapper class:

class Number<T>
{
    public Number(T value)
    {
        Value = value;
    }

    public T Value { get; set; }
}

Your code will be:

Number<int> num1 = new Number<int>(0);
Number<int> num2 = new Number<int>(0);
Number<int> num3 = new Number<int>(0);



private void button1_Click(object sender, EventArgs e)
{
    List<KeyValuePair<TextBox, Number<int>>> myList = new List<KeyValuePair<TextBox, Number<int>>>();
    myList.Add(new KeyValuePair<TextBox, Number<int>>(textBox1, num1));
    myList.Add(new KeyValuePair<TextBox, Number<int>>(textBox2, num2));
    myList.Add(new KeyValuePair<TextBox, Number<int>>(textBox3, num3));

    foreach (KeyValuePair<TextBox, Number<int>> kvp in myList)
    {
        TextBox tb = kvp.Key;
        try
        {
            kvp.Value.Value = int.Parse(tb.Text);
            //instead of using the hardcoded variable name num1 i want to use kvp.value
            //kvp.value = int.Parse(tb.Text);
        }
        catch
        {
            //blah blah
        }

    }

}

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