Returns the zero-based line number where source appears in target.

        
        
using System.Globalization;
using System.Linq;
using System.Text;

namespace jQueryBuddy.Utilities
{
    public static class StringExtensions
    {
        /// <summary>
        /// Returns the zero-based line number where <paramref name="source"/>
        /// appears in <paramref name="target"/>. Lines are counted wherever \n appears.
        /// </summary>
        /// <param name="target"></param>
        /// <param name="source"></param>
        /// <returns></returns>
        public static int GetLineNumberContaining(this string target, string source)
        {
            if (string.IsNullOrEmpty(target)) return -1;
            if (string.IsNullOrEmpty(source)) return -1;

            var position = target.IndexOf(source);
            if (position == -1) return -1;

            var lineCount = 0;
            for (var i = 0; i < position; i++)
            {
                if (target[i] == '\n') lineCount++;
            }
            return lineCount;
        }

    }
}

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Returns the zero-based line number where source appears in target. : Text File Read Write « File Stream « C# / C Sharp

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