C# Programming practice

Question

I want to update a control based on a value e.g:

       if (StringName == StringName2) 
            ListBox1.Items.Add("send data");
        else if (StringName3 == StringName4)
            DifferentListBox.Items.Add("send data");
        else if (StringName5 == StringName3)
            AnotherListBox.Items.Add("send data");

Or done using a switch statement and so on another 20 times for example.

Is it possible to put these methods (OneOfTheListBoxes.Items.Add("send data") to be put in a dictionary so i only need to enter the key to action the method instead of iterating through each statement.

Or can you point me to a practice that would make me achieve this? Or how to achieve this in less code?

Is it intentional that you are comparing different strings, e.g. (StringName == StringName2) vs. (StringName3 == StringName4)? This makes a big difference to the solution. — Patrick McDonald
– Patrick McDonald, Commented Jun 17, 2009 at 10:31

Kirschstein · Accepted Answer · 2009-06-17 10:23:43Z

7

Yes, you could put all the of the listboxes into a dictionary like so;

Dictionary<string, ListBox> _Dictionary;

public Something() //constructor
{
   _Dictionary= new Dictionary<string, ListBox>();
   _Dictionary.add("stringname1", ListBox1);
   _Dictionary.add("stringname2", ListBox2);
   _Dictionary.add("stringname3", ListBox3);
}


....


public void AddToListBox(string listBoxName, string valueToAdd)
{
  var listBox = _Dictionary[listBoxName];
  listBox.Items.Add(valueToAdd);
}

answered Jun 17, 2009 at 10:23

Kirschstein

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3 Comments

Pondidum Over a year ago

damn it! you beat me to it...+1

Mark Over a year ago

Kirschstein has a great solution. If annakata's (below) point is valid: you're testing against different strings, you can still use this solution as long as there is a 1:* string:ListBox relationship, just enter the ListBox more than once in the Dictionary. e.g., _Dictionary.Add("string1", ListBox1); _Dictionary.Add("string2", ListBox1);

Kirschstein Over a year ago

@North, not a problem! @Mark, I noticed the comparing of different strings a little while after I posted and started looking for a solution to it if this was the case, quite tricky!

van · Accepted Answer · 2009-06-17 10:24:48Z

1

Sure. Use dictionary with the key holding a StringName, and value holding a Listbox. Then use:

myDict[StringName].Items.Add("send data")

answered Jun 17, 2009 at 10:24

van

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