CODEWITHSUNDEEP
c#winformslistboxduplicateslistboxitem
Shadan64
Shadan64

Reputation: 3

Removing duplicate items from a ListBox in C#

I have a ListBox with 10 items like this:

1:3
2:2
2:2
2:2
1:3
6:8
6:8
9:1
7:2
9:1

I want to remove duplicates so the result looks like this:

1:3
2:2
6:8
9:1
7:2

Here is what I have tried:

private void button2_Click(object sender, EventArgs e)
{
    for (int p = 0; p < 10; p++)
    {
        a[p] = System.Convert.ToInt32(Interaction.InputBox("Please Enter 10 Number:", "", "", 350, 350));
        listBox1.Items.Add(a[p]);
    }
}

private void button3_Click(object sender, EventArgs e)
{
    for (int j = 0; j < 10; j++)
    {
        for (int k = 0; k < 10; k++)
        {
            if (a[j] == a[k])
                b = b + 1;
        } //end of for (k)
        listBox2.Items.Add(a[j] + ":" + b);
        b = 0;
    } //end og for (j)
}

Upvotes: 0

Views: 4525

Answers (2)

Logvinov Vladimir
Logvinov Vladimir

Reputation: 94

private void button1_Click(object sender, EventArgs e)
{
    string[] arr = new string[listBox1.Items.Count];
    listBox1.Items.CopyTo(arr, 0);

    var arr2 = arr.Distinct();

    listBox1.Items.Clear();
    foreach (string s in arr2)
    {
        listBox1.Items.Add(s);
    }
}

Upvotes: 0

mybirthname
mybirthname

Reputation: 18127

        List<string> p = new List<string>();

        p.Add("1:2");
        p.Add("1:4");
        p.Add("1:3");
        p.Add("1:2");

        List<string> z = p.Distinct().ToList();

Here is the easiest way to do it. Instead of direct listBox.Items.Add(value) add the values in List<string> and add it as DataSource of the listBox. You will perform Distinct() action before putting the DataSource. If this is asp.net you need listBox.DataBind() after that.

Edit:

private void button3_Click(object sender, EventArgs e)
{
    List<string> list = new List<string>();
    for (int j = 0; j < 10; j++)
    {
        for (int k = 0; k < 10; k++)
        {
            if (a[j] == a[k])
                b = b + 1;
        } //end of for (k)
        list.Add(a[j] + ":" + b);
        b = 0;
    } //end og for (j)

    List<string> result = list.Distinct().ToList();
    listBox2.DataSource = result;
    //listBox2.DataBind(); this is needed if it is asp.net, if it is winforms it is not needed !
}

Upvotes: 1

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