ICSharpCode.AvalonEdit.Document.TextDocument.GetLineByOffset C# (CSharp) Method

        public DocumentLine GetLineByOffset(int offset)
        {
            VerifyAccess();
            if (offset < 0 || offset > rope.Length) {
                throw new ArgumentOutOfRangeException("offset", offset, "0 <= offset <= " + rope.Length.ToString());
            }
            return lineTree.GetByOffset(offset);
        }

        public void CheckGetLineInEmptyDocument()
        {
            Assert.AreEqual(1, document.Lines.Count);
            List <DocumentLine> lines = new List <DocumentLine>(document.Lines);

            Assert.AreEqual(1, lines.Count);
            DocumentLine line = document.Lines[0];

            Assert.AreSame(line, lines[0]);
            Assert.AreSame(line, document.GetLineByNumber(1));
            Assert.AreSame(line, document.GetLineByOffset(0));
        }