Alsing.SourceCode.SyntaxDocument.GetRange C# (CSharp) Метод

        public string GetRange(TextRange Range)
        {
            if (Range.FirstRow >= Count)
                Range.FirstRow = Count;

            if (Range.LastRow >= Count)
                Range.LastRow = Count;

            if (Range.FirstRow != Range.LastRow)
            {
                //note:error has been tracked here
                Row r1 = this[Range.FirstRow];
                int mx = Math.Min(r1.Text.Length, Range.FirstColumn);
                string s1 = r1.Text.Substring(mx) + Environment.NewLine;

                //if (Range.LastRow >= this.Count)
                //	Range.LastRow=this.Count -1;

                Row r2 = this[Range.LastRow];
                if (r2 == null)
                    return "";

                int Max = Math.Min(r2.Text.Length, Range.LastColumn);
                string s2 = r2.Text.Substring(0, Max);

                var sb = new StringBuilder();
                for (int i = Range.FirstRow + 1; i <= Range.LastRow - 1; i++)
                {
                    Row r3 = this[i];

                    sb.Append(r3.Text + Environment.NewLine);
                }

                string s3 = sb.ToString();
                return s1 + s3 + s2;
            }
            else
            {
                Row r = this[Range.FirstRow];
                int Max = Math.Min(r.Text.Length, Range.LastColumn);
                int Length = Max - Range.FirstColumn;
                if (Length <= 0)
                    return "";
                string s = r.Text.Substring(Range.FirstColumn, Max - Range.FirstColumn);
                return s;
            }
        }