Removes blank lines from the beginning of the string.. - CSharp System

CSharp examples for System:String Strip

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Description

Removes blank lines from the beginning of the string..

Demo Code


using System.Linq;
using System.Diagnostics.Contracts;
using System;/* ww  w  .  ja  v a 2s .co m*/

public class Main{
        /// <summary>
        /// Removes blank lines from the beginning of the string..
        /// </summary>
        /// <param name="text">The text.</param>
        /// <param name="numberLines">The number lines.</param>
        /// <returns>A new string with any blank lines at the beginning removed.</returns>
        public static string RemoveLinesFromBeginning(this string text, int numberLines)
        {
            if (string.IsNullOrEmpty(text))
            {
                return string.Empty;
            }

            if (text.CountLines() < numberLines)
            {
                return string.Empty;
            }

            int start = 0;
            for (int i = 0; i < numberLines; i++)
            {
                start = text.IndexOf(Environment.NewLine, start, StringComparison.CurrentCulture);
                if (start < 0)
                {
                    return string.Empty;
                }

                start += Environment.NewLine.Length;
            }

            if (start < text.Length)
            {
                return text.Substring(start);
            }

            return string.Empty;
        }
        /// <summary>
        /// Counts the number of lines in the string.
        /// </summary>
        /// <param name="text">The text.</param>
        /// <returns></returns>
        public static int CountLines(this string text)
        {
            if (string.IsNullOrEmpty(text))
            {
                return 0;
            }

            int count = 0;
            int start = 0;
            bool done = false;
            while (done == false)
            {
                int n = text.IndexOf(Environment.NewLine, start, StringComparison.CurrentCulture);
                if (n == -1)
                {
                    done = true;
                    if (start < text.Length)
                    {
                        count++;
                    }
                }
                else
                {
                    start = n + Environment.NewLine.Length;
                    count++;
                }
            }

            return count;
        }
}

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