why foreach is faster than for loop while reading richtextbox lines

Question

There are two ways to read data from RichTextBox line by line

1 ) use a for loop to loop through lines of a richtextBox

String s=String.Empty;
for(in         


        

Answer 1

As Mehrdad noted, accessing the Lines property takes a long time. You need to be careful here - you're accessing it twice in each iteration at the moment:

String s = String.Empty;
for (int i = 0; i < richTextBox.Lines.Length; i++)
{
    s = richTextBox.Lines[i];
}

Even if you remove the access in the body of the loop like this:

String s = String.Empty;
for (int i = 0; i < richTextBox.Lines.Length; i++)
{
}

you're still accessing Lines on every iteration to see if you've finished!

If you don't want to foreach, you can just fetch Lines once:

string[] lines = richTextBox.Lines;
for (int i = 0; i < lines.Length; i++)
{
    s = lines[i];
}

Personally I prefer the foreach unless you really need the index though :)