Truncate a string and add an ellipsis ('...') to the end if it exceeds the specified length - CSharp System

CSharp examples for System:String Start End

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Description

Truncate a string and add an ellipsis ('...') to the end if it exceeds the specified length

Demo Code

/********/* w  ww.j  ava2 s .co  m*/
 * @version   : 1.0.0
 * @author    : Ext.NET, Inc. http://www.ext.net/
 * @date      : 2011-06-15
 * @copyright : Copyright (c) 2011, Ext.NET, Inc. (http://www.ext.net/). All rights reserved.
 * @license   : See license.txt and http://www.ext.net/license/. 
 ********/
using System.Web.UI;
using System.Web;
using System.Text.RegularExpressions;
using System.Text;
using System.Security.Cryptography;
using System.Globalization;
using System.ComponentModel;
using System.Collections.Generic;
using System.Collections;
using System;

public class Main{
        /// <summary>
        /// Truncate a string and add an ellipsis ('...') to the end if it exceeds the specified length
        /// </summary>
        /// <param name="text">The string to truncate</param>
        /// <param name="length">The maximum length to allow before truncating</param>
        /// <param name="word">True to try to find a common work break</param>
        /// <returns>The converted text</returns>
        public static string Ellipsis(this string text, int length, bool word)
        {
            if (text != null && text.Length > length)
            {
                if (word)
                {
                    string vs = text.Substring(0, length - 2);
                    int index = Math.Max(vs.LastIndexOf(' '), Math.Max(vs.LastIndexOf('.'), Math.Max(vs.LastIndexOf('!'), vs.LastIndexOf('?'))));
                    
                    if (index == -1 || index < (length - 15))
                    {
                        return text.Substring(0, length - 3) + "...";
                    }
                    
                    return vs.Substring(0, index) + "...";
                }
                
                return text.Substring(0, length - 3) + "...";
            }
            return text;
        }
        /// <summary>
        /// Truncate a string and add an ellipsis ('...') to the end if it exceeds the specified length
        /// </summary>
        /// <param name="text">The string to truncate</param>
        /// <param name="length">The maximum length to allow before truncating</param>
        /// <returns>The converted text</returns>
        public static string Ellipsis(this string text, int length)
        {
            return StringUtils.Ellipsis(text, length, false);
        }
}

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