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C# HttpUtility.HtmlEncode Methods
Access the HttpUtility class and call its methods HtmlDecode and HtmlEncode.HttpUtility. This is a useful class. It provides methods (HtmlEncode and HtmlDecode) that manipulate HTML strings. Other methods support URL encoding.HtmlEncode, HtmlDecode
Notes, class. HttpUtility is found in the System.Web namespace. It can be used in any project, not just an ASP.NET project. We must include the System.Web namespace.
An example. Here we use the HttpUtility class. The HtmlDecode and HtmlEncode methods are ideal for changing the representation of special characters in HTML strings.
Note: HTML uses some characters such as < and >. These characters are interpreted differently than others.
Here: In this example, the string literal value1 is assigned to an HTML string containing escaped HTML characters.
And: If you have unencoded user input, you must escape it before rendering it to another web page or HTTP response.
Warning: Make sure to test that these methods cause no "malicious encoding" warnings before deploying the application.
Page that uses HttpUtility methods: C#
using System;
using System.Diagnostics;
using System.Web;
using System.Web.UI;
public partial class _Default : Page
{
protected void Page_Load(object sender, EventArgs e)
{
//
// Shows how the HtmlDecode and HtmlEncode methods work.
//
string value1 = "<html>";
string value2 = HttpUtility.HtmlDecode(value1);
string value3 = HttpUtility.HtmlEncode(value2);
Debug.WriteLine(value1);
Debug.WriteLine(value2);
Debug.WriteLine(value3);
}
}
Debug output:
<html>
<html>
<html>
Converting. HtmlDecode and HtmlEncode are invoked with HTML parameters. The HttpUtility.HtmlDecode method transformed the encoded brackets into actual brackets.
And: The HtmlEncode method translated the decoded string back to the original encoded string.
A discussion. It is easy to use the HttpUtility methods in projects that are console projects or even Windows Forms programs. These are not request-based or written for the HTTP protocol.
Also: The other ways to encode data in System.Web may require actual Server intrinsic objects in the ASP.NET pipeline.
A summary. We looked at HttpUtility.HtmlDecode and HtmlEncode from System.Web. We must ensure that the System.Web assembly is loaded into the assembly references in the project.
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- 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