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

I think the Lines property is recalculated every time you want to access it. Consequently, the foreach method performs the calculation only once, while every time your reference Lines[i] it's re-evaluating the whole thing. Try caching the result of Lines property and checking again:

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

By the way, your question makes an implicit assumption that foreach is always slower than for. This is not always true.