Dynamically generated Javascript, CSS in ASP.NET MVC

The best solution so far I found for that is the following:

Dynamic Javascript and CSS in ASP.NET MVC using Razor Views

You just create views: CurrentUserOverrides.css.cshtml, ContactViewModel.js.cshtml. This views will contain single HTML block (<script> or <style>), so IntelliSense works fine. Then you create controller that renders that view, trims the root tag and return content with appropriate content type.

It's too late but still interesting subject, here is my solution: form your cshtml call like that:

<script src='@Url.Action("GetJS", "Home")'></script>

Create a controller method that generate the JS or CSS like that :

public ActionResult GetJS()
{
     byte[] jsDATA = System.Text.ASCIIEncoding.ASCII.GetBytes(mystingJS); 
     return File(jsDATA, "text/javascript");
}

Dynamic CSS in a CSHTML File

I use CSS comments /* */ to comment out a new <style> tag and then I return; before the closing style tag:

/*<style type="text/css">/* */

    CSS GOES HERE

@{return;}</style>

Dynamic JS in a CSHTML File

I use JavaScript comments <!--// to comment out a new <script> tag and then I return; before the closing script tag:

//<script type="text/javascript">

    JAVASCRIPT GOES HERE

@{return;}</script>

MyDynamicCss.cshtml

@{
var fieldList = new List<string>();
fieldList.Add("field1");
fieldList.Add("field2");

}/*<style type="text/css">/* */

@foreach (var field in fieldList) {<text>

input[name="@field"]
, select[name="@field"]
{
    background-color: #bbb;
    color: #6f6f6f;
}

</text>}

@{return;}</style>

MyDynamicJavsScript.cshtml

@{
var fieldList = new List<string>();
fieldList.Add("field1");
fieldList.Add("field2");
fieldArray = string.Join(",", fieldList);

}

//<script type="text/javascript">

$(document).ready(function () {
    var fieldList = "@Html.Raw(fieldArray)";
    var fieldArray = fieldList.split(',');
    var arrayLength = fieldArray.length;
    var selector = '';
    for (var i = 0; i < arrayLength; i++) {
        var field = fieldArray[i];
        selector += (selector == '' ? '' : ',')
                    + 'input[name="' + field + '"]'
                  + ',select[name="' + field + '"]';            
    }
    $(selector).attr('disabled', 'disabled');
    $(selector).addClass('disabled');
});
@{return;}</script>

No Controller Required (using Views/Shared)

I put both of my dynamic scripts into Views/Shared/ and I can easily embed them into any existing page (or in _Layout.cshtml) using the following code:

<style type="text/css">@Html.Partial("MyDynamicCss")</style>
<script type="text/javascript">@Html.Partial("MyDynamicJavaScript")</script>

Using a Controller (optional)

If you prefer you may create a controller e.g.

<link rel="stylesheet" type="text/css" href="@Url.Action("MyDynamicCss", "MyDynamicCode")">
<script type="text/javascript" src="@Url.Action("MyDynamicJavaScript", "MyDynamicCode")"></script>

Here's what the controller might look like

MyDynamicCodeController.cs (optional)

[HttpGet]
public ActionResult MyDynamicCss()
{
    Response.ContentType = "text/css";
    return View();
}

[HttpGet]
public ActionResult MyDynamicJavaScript()
{
    Response.ContentType = "application/javascript";
    return View();
}

Notes

• The controller version is not tested. I just typed that off the top of my head.
• After re-reading my answer, it occurs to me it might be just as easy to comment out the closing tags rather than use the cshtml @{return;}, but I haven't tried it. I imagine it's a matter of preference.
• Concerning my entire answer, if you find any syntax errors or improvements please let me know.