How to get the current line in a RichTextBox control?

问题

Say I clicked somewhere inside a RichTextBox control. How can I get the current line the caret is currently on?

Btw this is to retrieve the whole text string of that line.

回答1:

That's what RichTextBox.GetLineFromCharIndex() does. Pass the SelectionStart property value.

回答2:

This worked for me:

this.WordWrap = false;
int cursorPosition = this.SelectionStart;
int lineIndex = this.GetLineFromCharIndex(cursorPosition);
string lineText = this.Lines[lineIndex];
this.WordWrap = true;

回答3:

One way is to send it the EM_LINEFROMCHAR Message. I'm sure there are other ways.

回答4:

If you want to get current Line Number from the editor Control where you are debugging now then

int lineNumber = (new StackTrace()).GetFrame(1).GetFileLineNumber();

I think it is helpful for your problem.

来源：https://stackoverflow.com/questions/2693984/how-to-get-the-current-line-in-a-richtextbox-control