System.Runtime.Extensions defines both UrlDecode and HtmlDecode.

namespace System.Net{    public static partial class WebUtility    {        public static string HtmlDecode(string value) { return default(string); }        public static string HtmlEncode(string value) { return default(string); }        public static string UrlDecode(string encodedValue) { return default(string); }        public static byte[] UrlDecodeToBytes(byte[] encodedValue, int offset, int count) { return default(byte[]); }        public static string UrlEncode(string value) { return default(string); }        public static byte[] UrlEncodeToBytes(byte[] value, int offset, int count) { return default(byte[]); }    }}

Update

While System.Runtime.Extensions defines the extension, as you can notice from it's code the actual class you need to call is System.Net.WebUtility

Option 1: System.Net.WebUtility

• Documentation
• Source Code

Currently there are no publicly made plans to include Decode in Microsoft.Framework.WebEncoders.

Usage

System.Net.WebUtility.UrlEncode(myString)System.Net.WebUtility.UrlDecode(myString)

Option 2: System.Text.Encodings.Web.UrlEncoder

• Source Code

This is registered in the asp.net core service container and is injectable into your controllers etc.