Shorten input text to a desired length, preserving words and appending the specified trailer. - CSharp System

CSharp examples for System:String Shorten

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Description

Shorten input text to a desired length, preserving words and appending the specified trailer.

Demo Code

// Copyright (c) 2012 Computer Technology Solutions, Inc.  ALL RIGHTS RESERVED
using System.Text.RegularExpressions;
using System.Text;
using System.Linq;
using System.Globalization;
using System.Collections.Generic;
using System;//from  w  ww.  ja v a 2s  .c o  m

public class Main{
        /// <summary>
        /// Shorten input text to a desired length, preserving words and appending the
        /// specified trailer.
        /// </summary>
        /// <param name="input"></param>
        /// <param name="length"></param>
        /// <param name="trailer"></param>
        /// <returns>A string with the trailer attached if the string greater than length</returns>
        public static string AbbreviateText(this string input, int length, string trailer = "?")
        {
            if (string.IsNullOrEmpty(input))
            throw new ArgumentNullException("input");

            if (null == trailer)
            throw new ArgumentNullException("trailer");

            StringBuilder output = new StringBuilder(length + 20); //Add room for a word not breaking and the trailer			

            string[] words = input.Split(new char[] { ' ' });
            int i = 0;
            while (((output.Length + words[i].Length + trailer.Length) < (length - trailer.Length))
                    && (i < words.GetUpperBound(0)))
            {
                output.Append(words[i]);
                output.Append(" ");
                i++;
            }

            if (i < words.GetUpperBound(0)) //We exited the loop before reaching the end of the array - which would normally be the case.
            {
                output.Remove(output.Length - 1, 1); //Remove the ending space before attaching the trailer.
                output.Append(trailer);
            }
            else
            {
                output.Append(words[i]);
            }

            return output.ToString();
        }
}

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