Question

I have a site that allows users to upload a document such as pdf, word, excel etc.

Now in my code, when I want to show the document in a browser, I am checking for the extension and setting the ContentType appropriately.

However, this switch statement just doesn’t sound like the best solution.

Is there a way I can set the content type based on the Stream?

Answer 1

If you don’t want to use switch like statements, use Dictionary to add possible MIME-entries.

Dictionary<string, string> map=new Dictionary<string, string>
{
  {"txt", "text/plain"},                                                
  {"exe", "application/octet-stream"},
  {"bmp", "image/bmp"}
};

and set content type,

Response.ContentType=map[ext];

I’ve found an interesting stackoverflow thread – Using .NET, how can you find the mime type of a file based on the file signature not the extension