How to concat Listbox values into string in Winforms

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Hello,
I want to know how to concat ListBox values into a string or an array in winforms. Can you guide me or send any code snippets?

Thanks in advance!

[EDIT] : Duplicate question How to concat Listbox values into string in Winforms[^] <-- Duplicate already deleted by Manfred R. Bihy[^]

Posted 12-Jun-12 3:27am

kingsa

Updated 12-Jun-12 3:35am

Manfred Rudolf Bihy

v6

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3 solutions

Solution 3

C#

//Below linq query concat all the selected item
 string required =listBox1.SelectedItems.Cast<string>().Aggregate((a, b)=>a+b);

//Below linq query concat all the distinct selected item
 string required =listBox1.SelectedItems.Cast<string>().Distinct()
                  .Aggregate((a, b)=>a+b);

//Below linq query concat all the selected item with a string in between
 
string required =listBox1.SelectedItems.Cast<string>().Distinct()
                  .Aggregate((a, b)=>a+","+b);

Posted 10-Jun-15 0:15am

sasanka sekhar panda

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OriginalGriff · Accepted Answer · 2012-06-12T03:32:00

Solution 1

Best way is to use a StringBulder:

C#

StringBuilder sb = new StringBuilder();
foreach (object o in myListBox.SelectedItems)
    {
    sb.AppendLine(o.ToString());
    }
string s = sb.ToString();

Posted 12-Jun-12 3:32am

OriginalGriff

Comments

VJ Reddy 12-Jun-12 13:11pm

Good answer. 5!

Maciej Los 12-Jun-12 13:14pm

Agree with you ;) +5

VJ Reddy · Accepted Answer · 2012-06-12T07:10:00

The solution 1 given by OriginalGriff is good.

Alternatively, using string.Join method and LINQ can be used as follows

C#

//Here object is used as Type argument as the type of items is not given in
//the question. Otherwise, if the type of items in listBox is Person
//then .OfType<Person> can be used

//Array of Items as strings
string[] itemsAsStrings = (from p in listBox1.Items.OfType<object>()
                           select p.ToString()).ToArray();

//Array of Items
object[] arrayOfItems = listBox1.Items.OfType<object>().ToArray();

//Concatenation of all items of list box
string allItems = string.Join(", ",listBox1.Items.OfType<object>());

//Concatenation of selected tiems of list box
string selectedItems= string.Join(", ",listBox1.SelectedItems.OfType<object>());