How to add items to a string array from a dropdownlist

Question

I have a dropdownlist (specialty) and I want to loop through the number of options in the specialty and add it an array:

string[] strSpecArrayForTopics = new string[Specialty.Items.Count]; //total number of specialty items
foreach (ListItem li in Specialty.Items) //for each item in the dropdownlist
{
    strSpecArrayForTopics[Specialty.Items.Count] = li.Value; //add the value to the array (The error happens here)
    lblSpec.Text = lblSpec.Text + "<br />" + li.Value; //this works fine.
}

So let's say the specialty dropdownlist has:

All
Card
Intern
Rad

The array should be:

strSpecArrayForTopics[0] = "All";
strSpecArrayForTopics[1] = "Card";
strSpecArrayForTopics[2] = "Intern";
strSpecArrayForTopics[4] = "Rad";

What is your question? What is the error? Think about that, and I think you might get a hand of it yourself ... — Xeun
– Xeun, Commented Jan 14, 2015 at 14:50

Xiaoy312 · Accepted Answer · 2015-01-14 14:53:50Z

2

var strSpecArrayForTopics = Specialty.Items.Cast<ListItem>().Select(x => x.Value).ToArray();

answered Jan 14, 2015 at 14:53

Xiaoy312

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Comments

Paresh J · Accepted Answer · 2015-01-14 14:53:09Z

1

You need to add index to your array. Check the below code:

string[] strSpecArrayForTopics = new string[Specialty.Items.Count]; //total number of specialty items
int index = 0;
foreach (ListItem li in Specialty.Items) //for each item in the dropdownlist
{
    strSpecArrayForTopics[index] = li.Value; //add the value to the array (The error happens here)
    lblSpec.Text = lblSpec.Text + "<br />" + li.Value; //this works fine.
    index = index + 1;
}

answered Jan 14, 2015 at 14:53

Paresh J

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2 Comments

SearchForKnowledge Over a year ago

I beat you to it ;) Thanks for your response though.

Paresh J Over a year ago

@SearchForKnowledge: Yeah!!! Great to found your answer on your own. Great job!!!

Selman Genç · Accepted Answer · 2015-01-14 14:51:02Z

1

You are looking for a for loop.

for(int i = 0;i < Specialty.Items.Count; i++) //for each item in the dropdownlist
{
    strSpecArrayForTopics[i] = Specialty.Items[i].Value; 
    lblSpec.Text = lblSpec.Text + "<br />" + Specialty.Items[i].Value; 
}

answered Jan 14, 2015 at 14:51

Selman Genç

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Comments

SearchForKnowledge · Accepted Answer · 2015-01-14 14:51:58Z

1

I also used this as a solution:

string[] strSpecArrayForTopics = new string[Specialty.Items.Count];
int k = 0;
foreach (ListItem li in Specialty.Items)
{

    strSpecArrayForTopics[k] = li.Value;
    lblSpec.Text = lblSpec.Text + "<br />" + li.Value;
    k++;
}

answered Jan 14, 2015 at 14:51

SearchForKnowledge

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Comments

Grax32 · Accepted Answer · 2015-01-14 14:54:19Z

1

You can also use LINQ for this.

using System.Linq;

string[] strSpecArrayForTopics = Specialty.Items.Select(v => v.Value).ToArray();

if .Value is of type object, use the following.

string[] strSpecArrayForTopics = Specialty.Items.Select(v => (string)v.Value).ToArray();

answered Jan 14, 2015 at 14:54

Grax32

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