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C# HtmlEncode and HtmlDecode
Use the HtmlEncode and HtmlDecode methods, and see the output of these methods.HtmlEncode, HtmlDecode. HTML must sometimes be encoded. This is necessary for it to be displayed as text in another HTML document.HttpUtility
With WebUtility.HtmlEncode and HtmlDecode, we do this without writing any custom code. We just call a method. We must include the System.Net assembly.
An example. Here we use HtmlEncode and HtmlDecode in a C# program. The System.Net assembly is included at the top of the program.
Part A: The HtmlEncode method is designed to receive a string that contains HTML markup characters such as > and <.
Part B: HtmlDecode, meanwhile, is designed to reverse those changes. It changes encoded characters back to actual HTML.
C# program that uses HtmlEncode and HtmlDecode
using System;
using System.Net;
class Program
{
static void Main()
{
// Part A: encode this string.
string encoded = WebUtility.HtmlEncode("<b>Hello 'friend'</b>");
// Part B: reverse the change.
string decoded = WebUtility.HtmlDecode(encoded);
// Print results.
Console.WriteLine("ENCODED: {0}", encoded);
Console.WriteLine("DECODED: {0}", decoded);
}
}
Output
ENCODED: <b>Hello 'friend'</b>
DECODED: <b>Hello 'friend'</b>
Example 2. HtmlEncode and HtmlDecode are also built into the Server objects in ASP.NET. These methods have no advantages over the HttpUtility methods. They are equivalent.
Here: We see 3 methods. The first 2 return an encoded or decoded string, and the HtmlTextWriter uses a method called WriteEncodedText.
Note: This may be more efficient, as it could avoid a string copy. I tested these methods with breakpoints.
HtmlTextWriterC# program that uses ASPX code-behind, encodes HTML
using System;
using System.IO;
using System.Web;
using System.Web.UI;
public partial class _Default : Page
{
protected void Page_Load(object sender, EventArgs e)
{
// This could mess up HTML.
string text = "you & me > them"; // 1
// Replace > with >
string htmlEncoded = Server.HtmlEncode(text); // 2
// Now has the > again.
string original = Server.HtmlDecode(htmlEncoded); // 3
// This is how you can access the Server in any class.
string alsoEncoded = HttpContext.Current.Server.HtmlEncode(text); // 4
StringWriter stringWriter = new StringWriter();
using (HtmlTextWriter writer = new HtmlTextWriter(stringWriter))
{
// Write a DIV with encoded text.
writer.RenderBeginTag(HtmlTextWriterTag.Div);
writer.WriteEncodedText(text);
writer.RenderEndTag();
}
string html = stringWriter.ToString(); // 5
}
}
Notes:
1: Before encoding has occurred.
String: you & me > them
2: The string is encoded for HTML.
String: you & me > them
3: String is converted back from HTML.
String: you & me > them
4: The string is encoded for HTML again.
String: you & me > them
5: The HTML string is written into a DIV.
Text: <div>you & me > them</div>
Notes. The WebUtility class is an effective way to encode HTML and URLs in programs. Call WebUtility.HtmlDecode and WebUtility.HtmlEncode on your strings.
Performance. I found Server.HtmlEncode and Server.HtmlDecode to be much faster than a home-grown version that used StringBuilder. Usually it is best to use the Framework methods.StringBuilder
A summary. These methods provide reliable replacement of HTML characters. HtmlEncode and HtmlDecode also handle character entities. These are sequences that represent non-ASCII characters.
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- C# Remove Char From String at Index
- C# Remove Element
- C# Remove HTML Tags
- C# Remove String
- C# Reserved Filenames
- C# return Keyword
- C# Reverse String
- C# Reverse Words
- C# Reverse Extension Method
- C# RichTextBox Example
- C# Right String Part
- C# RNGCryptoServiceProvider Example
- C# ROT13 Method, Char Lookup Table
- C# SelectMany Example: LINQ
- C# Sentinel Optimization
- C# SequenceEqual Method (If Two Arrays Are Equal)
- C# Shift Operators (Bitwise)
- C# Short and ushort Types
- C# Single Method: Get Element If Only One Matches
- C# SingleOrDefault
- C# Singleton Pattern Versus Static Class
- C# Singleton Class
- C# sizeof Keyword
- C# Skip and SkipWhile Examples
- C# Sleep Method (Pause)
- C# Sort Dictionary: Keys and Values
- C# Sort by File Size
- C# Sort, Ignore Leading Chars
- C# Sort KeyValuePair List: CompareTo
- C# Sort Strings by Length
- C# Thread.SpinWait Example
- C# Math.Sqrt Method
- C# stackalloc Operator
- C# StackOverflowException
- C# StartsWith and EndsWith String Methods
- C# Static Array
- C# Static Dictionary
- C# Stopwatch Examples
- C# Stream
- C# StreamReader ReadToEnd Example (Read Entire File)
- C# StreamReader ReadToEndAsync Example (Performance)
- C# StreamReader Examples
- C# StreamWriter Examples
- C# String Append (Add Strings)
- C# String Compare and CompareTo Methods
- C# String Constructor (new string)
- C# string.Copy Method
- C# CopyTo String Method: Put Chars in Array
- C# Empty String Examples
- C# String Equals Examples
- C# String For Loop, Count Spaces in String
- C# string.Intern and IsInterned
- C# String IsUpper, IsLower
- C# String Length Property: Get Character Count
- C# String Literal: Newline and Quote Examples
- C# StringBuilder Capacity
- C# StringBuilder Clear (Set Length to Zero)
- C# StringBuilder Data Types
- C# StringBuilder Performance
- C# StringBuilder Equals (If Chars Are Equal)
- C# StringBuilder Memory
- C# StringBuilder ToString: Get String From StringBuilder
- C# StringWriter Class
- C# Sum Method: Add up All Numbers
- C# Switch Char, Test Chars With Cases
- C# Switch Enum
- C# System (using System namespace)
- C# Tag Property: Windows Forms
- C# TextInfo Examples
- C# TextReader, Returned by File.OpenText
- C# TextWriter, Returned by File.CreateText
- C# this Keyword
- C# ThreadPool
- C# Thread Join Method (Join Array of Threads)
- C# ThreadPool.SetMinThreads Method
- C# TimeZone Examples
- C# Get Title From HTML With Regex
- C# ToArray Extension Method
- C# ToCharArray: Convert String to Array
- C# ToDictionary Method
- C# Token
- C# ToList Extension Method
- C# ToLookup Method (Get ILookup)
- C# ToLower and ToUpper: Uppercase and Lowercase Strings
- ToolStripContainer Control: Dock, Properties
- C# ToolTip: Windows Forms
- C# ToString Integer Optimization
- C# ToString: Get String From Object
- C# ToTitleCase Method
- C# TrackBar: Windows Forms
- C# Tree and Nodes Example: Directed Acyclic Word Graph
- C# TreeView Tutorial
- C# Trim Strings
- C# Thread Methods
- C# History
- C# Features
- C# Variables
- C# Data Types
- C# Operators
- C# Keywords
- C# New Features | C# Version Features
- C# Programs
- C# Program to swap numbers without third variable
- C# Program to convert Decimal to Binary
- C# Program to Convert Number in Characters
- C# Program to Print Alphabet Triangle
- C# Program to print Number Triangle
- C# Program to generate Fibonacci Triangle
- C# String Compare() method
- C# String CompareOrdinal() method
- C# String CompareTo() method
- C# String Concat() method
- C# String Contains() method
- C# String CopyTo() method
- C# String EndsWith() method
- C# String Equals() method
- C# String Format() method
- C# String IndexOf() method
- C# String Insert() method
- C# String Intern(String str) method
- C# String IsInterned() method
- C# String Normalize() method
- C# String IsNullOrEmpty() method
- C# String IsNullOrWhiteSpace() method
- C# String Join() method
- C# String LastIndexOf() method
- C# String LastIndexOfAny() method
- C# String PadLeft() method
- C# String PadRight() method
- C# Nullable
- C# String Remove() method
- C# String Replace() method
- C# String Split() method
- C# String StartsWith() method
- C# String SubString() method
- C# Partial Types
- C# Iterators
- C# Delegate Covariance
- C# Delegate Inference
- C# Anonymous Types
- C# Extension Methods
- C# Query Expression
- C# Partial Method
- C# Implicitly Typed Local Variable
- C# Object and Collection Initializer
- C# Auto Implemented Properties
- C# Dynamic Binding
- C# Named and Optional Arguments
- C# Asynchronous Methods
- C# Caller Info Attributes
- C# Using Static Directive
- C# Exception Filters
- C# Await in Catch Finally Blocks
- C# Default Values for Getter Only Properties
- C# Expression Bodied Members
- C# Null Propagator
- C# String Interpolation
- C# nameof operator
- C# Dictionary Initializer
- C# Pattern Matching
- C# Tuples
- C# Deconstruction
- C# Local Functions
- C# Binary Literals
- C# Ref Returns and Locals
- C# Expression Bodied Constructors and Finalizers
- C# Expression Bodied Getters and Setters
- C# Async Main
- C# Default Expression