Copying a rich Text Box to a list Box.....

Glenn Patton

Hi All,

Yet another question, I have a large amount of data in a Rich Text Box that I am trying to copy to a List Box. Using the ListBox.Items.Add() method will pick up the text and copy it lock stock & barrel to the list box ignoring any carridge return/ line feeds in the rich text box. what I am pretty sure I need is a foreach loop to go into the richTextBox.
and each time there is a \n add the item to the listBox but I am unsure of how to format this foreach loop. I have tried :

int a = 0;

string[] Readings = Value.Split('\n');
foreach (string v in Readings)
{
a++;
listBox1.Items.Add(a);
}

5 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes14y ago
Accepted answer
As long as each line in the RichTextBox ends with a carriage return and the ListBox is not data-bound, then code such as this should work:

if (richTextBox1.Lines.Length > 0)
{
listBox1.Items.AddRange((object[])richTextBox1.Lines);
}
Vulpes14y ago
It's good in some ways and bad in others.

When you have 5 minutes, give this a read:

http://blogs.msdn.com/b/ericlippert/archive/2007/10/17/covariance-and-contravariance-in-c-part-two-array-covariance.aspx
Glenn Patton14y ago
Well, that good I think(!) C# seems to give you more ways out of holes than C++, I take it you are a C++ guy ....
Vulpes14y ago
In fact, I've just tried it myself and it works even without the cast to object[] because arrays in C# are co-variant:

listBox1.Items.AddRange(richTextBox1.Lines);
Glenn Patton14y ago
Many thanks again!