How To Render CSS Inline In ASP.NET Web Form

Question

I am using System.Web.Optimization to bundle the css and script.But now I want to render css and scripts inline instead of refer to a single file.

I am trying to create an extension method for System.Web.Optimization.Render() but I am not able to provide parameter as HttpContextBase for the method GenerateBundleResponse()

Following is my code with Error

    public static class OptimizationStylesExtention
    {

      private static string GetBundleContent(HttpContextBase httpContextBase, 
        string bundleVirtualPath)
       {
            return BundleTable.Bundles
                .Single(b => b.Path == bundleVirtualPath)
                .GenerateBundleResponse(new BundleContext(httpContextBase, 
                            BundleTable.Bundles, bundleVirtualPath)).Content;
        }

    public static IHtmlString RenderInline(this HtmlString str, params string[] 
    bundleVirtualPath)
    {
        StringBuilder bundleContent = new StringBuilder();
        foreach (var virtualPath in bundleVirtualPath)
        {
            bundleContent.Append(BundleTable.Bundles.Single(b => b.Path == virtualPath)
            .GenerateBundleResponse(new BundleContext(str, BundleTable.Bundles, virtualPath)));
        }
        return new HtmlString(string.Format("{<style>{0}</style>}", bundleContent.ToString()));
    }
}

Here is solutions for ASP.NET MVC but I want it for ASP.NET Web Form using C#. codeshare.co.uk/blog/… — Praveen Kumar
– Praveen Kumar, Commented Jun 8, 2018 at 6:20

Sourabh Somani · Accepted Answer · 2019-02-21 09:24:10Z

Hello you can do using GenerateBundleResponse Metho. Which is the method of BundleResponse class.

Here is the code

using System.Web.Optimization;

/// <summary>
/// This is the extension for the bundle. 
/// Which is used when we want to use inline css with style tag
/// </summary>
public static class BundleExtensions
{
    /// <summary>
    /// Returns inline css with style tag
    /// </summary>
    /// <param name="VirtualPath">Accepts Virtual Path</param>
    /// <returns>string as inline css</returns>
    public static string InlineStyle(string VirtualPath)
    {
        var CSSBundle = BundleTable.Bundles.GetBundleFor(VirtualPath);
        var CSS = CSSBundle.GenerateBundleResponse(new BundleContext(new System.Web.HttpContextWrapper(System.Web.HttpContext.Current), BundleTable.Bundles, string.Empty)).Content;
        return string.Format("<style type='text/css'>{0}</style>",CSS);
    }
    /// <summary>
    /// Returns inline script with script tag
    /// </summary>
    /// <param name="VirtualPath">Accepts Virtual Path</param>
    /// <returns>string as inline script</returns>
    public static string InlineScript(string VirtualPath)
    {
        var JSBundle = BundleTable.Bundles.GetBundleFor(VirtualPath);
        var JS = JSBundle.GenerateBundleResponse(new BundleContext(new System.Web.HttpContextWrapper(System.Web.HttpContext.Current), BundleTable.Bundles, string.Empty)).Content;
        return string.Format("<script type='text/javascript'>{0}</script>", JS);
    }
}

And In your ASP.NET Page, You can call that method as follows

<%=BundleExtensions.InlineStyle("~/css/new_home_page") %>

Thank You :)

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