Currently, I am working on updating a email templating system to incorporate external .css files instead of having all styles coded inline. In my ASP.NET project, it seems that the most commonly used and comprehensive inliner is PreMailer.Net. However, I am willing to explore other packages if there are better alternatives available. Here's an overview of what I am aiming to achieve:
Directory Structure
G:/templates/
index.html
style.css
inliner.cs
string htmlSource = File.ReadAllText("G:\\templates\\index.html");
var uri = new Uri("G:\\templates\\");
var result = PreMailer.MoveCssInline(uri, htmlSource);
index.html
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href='style.css'>
</head>
<body>
</body>
</html>
Upon running this code snippet, I encounter the following error message:
Unable to cast object of type 'System.Net.FileWebResponse' to type 'System.Net.HttpWebResponse'.
Based on the documentation, it is unclear whether PreMailer.Net supports this specific use-case. It mentions the ability to utilize a relative URL when specifying a BaseUri parameter. The C# code that executes PreMailer.Net has access to the necessary context and can retrieve the file path, as demonstrated by successfully reading the HTML file into a string.