Question

Lets say I want to loop trough all the files in a directory and if the file has an extension of an image format such as jpeg, bmp, or png, I want to copy the file to another directory. Is there a way I can check for all image extensions without chaining || together? Here is an example:

Instead of:

if(file.Extension == ".jpg" || 
     file.Extension == ".jpeg" || 
     file.Extension == ".bmp" || 
     file.Extension == ".png")
            //Copy To Image directory

Can I do something like:

if (file.Extension.Contains(...)).

I know Contains exists, but it does not take an array of values (extensions in this case)

Answer 1

List<string>validExtensions = new List<string>(){".jpg", ".jpeg" /* rest go here */ };
if(validExtensions.Contains(myFilenameExension))
{...}

If you have a LOT of extensions I’d switch it from a List to a HashSet, but for a small number of values (i.e. 4) a List will be either the same or quicker.