What is MIME type "text/x-csharp"?

A MIME type is a string that tells browsers and other tools how to handle a particular kind of file.

The MIME type text/x-csharp marks files as containing C# code. It tells software that the text follows the syntax and rules of the C# language.
This helps code editors and compilers apply the right syntax highlighting and formatting.

Files with this MIME type are used in several ways:

• Providing standard CS source files for C# projects.
• Enabling script execution in files like CSX.
• Supporting build automation with CAKE files that use C# syntax.
• Handling specialized or preprocessed code in files such as CS.PP.
• Accommodating less common variants like BF, EQ, LINQ, and UNO that follow similar code rules.

This non-standard label (with the x- prefix) means it isn’t officially registered but is commonly used among developers. It ensures that files containing C# code are recognized by various development tools and environments.

Associated file extensions

.cs, .bf, .csx, .cake, .cs.pp, .eq, .linq, .uno

Usage Examples

HTTP Header

When serving content with this MIME type, set the Content-Type header:

    Content-Type: text/x-csharp
  

HTML

In HTML, you can specify the MIME type in various elements:

    <a href="file.dat" type="text/x-csharp">Download file</a>
  

Server-side (Node.js)

Setting the Content-Type header in Node.js:

    const http = require('http');
    
    http.createServer((req, res) => {
      res.setHeader('Content-Type', 'text/x-csharp');
      res.end('Content here');
    }).listen(3000);
  

Associated file extensions

.cs, .bf, .csx, .cake, .cs.pp, .eq, .linq, .uno