HTML-encodes a string and returns the encoded string. - CSharp System

CSharp examples for System:String HTML

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Description

HTML-encodes a string and returns the encoded string.

Demo Code


using System.Text;
using System.Globalization;
using System;/* ww w  .  java 2s. c o  m*/

public class Main{
        /// <summary>
        /// HTML-encodes a string and returns the encoded string.
        /// </summary>
        /// <param name="text">The text string to encode. </param>
        /// <returns>The HTML-encoded text.</returns>
        public static string HtmlEncode(this string text)
        {
            if (text == null)
                return null;

            var sb = new StringBuilder(text.Length);

            var len = text.Length;
            for (var i = 0; i < len; i++)
            {
                switch (text[i])
                {

                    case '<':
                        sb.Append("&lt;");
                        break;
                    case '>':
                        sb.Append("&gt;");
                        break;
                    case '"':
                        sb.Append("&quot;");
                        break;
                    case '&':
                        sb.Append("&amp;");
                        break;
                    default:
                        if (text[i] > 159)
                        {
                            // decimal numeric entity
                            sb.Append("&#");
                            sb.Append(((int)text[i]).ToString(CultureInfo.InvariantCulture));
                            sb.Append(";");
                        }
                        else
                            sb.Append(text[i]);
                        break;
                }
            }
            return sb.ToString();
        }
}

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