.NET convert external CSS to inline CSS [closed]

Answer 1

Using .NET Core, I solved this problem by defining a function as follows

public static string InlineFile(string path)
{
    return System.IO.File.ReadAllText("wwwroot/" + path);
}

and then calling it in a view as

<style>
    @Html.Raw(Utilities.InlineFile("account/css/style.css"));
</style>

The reason behind separately defining the function is to avoid changing all paths in case the hosting environment changes. Beware that you cannot inline media rules.

Answer 2

Premailer.Net should do the trick it's written in C#

C# .Net library, that moves your stylesheets to inline style attributes, for maximum compatibility with E-mail clients.

Here is the Git repo: https://github.com/milkshakesoftware/PreMailer.Net: