URL Encode and Decode in ASP.NET Core

• For ASP.NET Core 2.0+ just add System.Net namespace - WebUtility class is shipped as part of System.Runtime.Extensions nuget package, that is referenced by default in ASP.NET Core project.

• For the previous version add Microsoft.AspNetCore.WebUtilities nuget package.

Then the WebUtility class will be available for you:

public static class WebUtility
{
    public static string UrlDecode(string encodedValue);
    public static string UrlEncode(string value);
}

It's available on version 2.0.0 of the .Net Core SDK, in System.Net.WebUtility.UrlEncode (see documentation)

For ASP.Net Core 2.0+ and if you need spaces to be encoded as %20

as opposed to +;

Use:

 Uri.EscapeDataString(someString);

I'm using a redirect, and UrlEncode did not work for me because it encodes the entire url. I solved this by instead using UriHelper.Encode, shown below.

UriHelper.Encode

// generate url string...
return Redirect(Microsoft.AspNetCore.Http.Extensions.UriHelper.Encode(new System.Uri(url)));