For Each to loop over HttpFileCollection Files

Recently I was working with file uploads in .NET and found that theres no clean way to loop over each uploaded file.  Here is a extension method for easily looping through the list and it allows filtering by field name and applying Regex to the file name.

Samples:

	Request.Files.Each(
	(file, name) => model.otherLogos = model.otherLogos.Concat(new string[] {file.FileName}).ToArray(),
	"otherLogos"
	);
	Request.Files.Each(
	(file, name) => file.SaveAs(String.Format("{0}/{2}", rootPath, file.FileName)),
	"otherLogos",
	new Regex(".*(?<!exe|php|aspx|asp|cs|vp|dll|scr)$") // Prevent uploading specified exstentions.
	);

view raw FileUpload-Sample.cs hosted with ❤ by GitHub

Source Code

	using System;
	using System.Collections.Generic;
	using System.Linq;
	using System.Text;
	using System.Text.RegularExpressions;
	using System.Web;
	namespace
	{
	public static class HttpFileCollectionExtensions
	{
	/// <summary>
	/// Loop through each file and raise a callback function.
	/// </summary>
	/// <param name="self">File Collection to loop through.</param>
	/// <param name="callback">Callback function to call and pass file name and form field name.</param>
	/// <param name="fieldFilter">If provided only include files posted to this form field.</param>
	/// <param name="fileNameFilter">If provided only include files matching this expression.</param>
	public static void Each(this HttpFileCollection self, Action<HttpPostedFile, string> callback, string fieldFilter = "", Regex fileNameFilter = null)
	{
	for (int i = 0; i < self.Count; i++)
	{
	if (String.IsNullOrEmpty(fieldFilter) || self.Keys[i] == fieldFilter)
	{
	if (fileNameFilter == null || fileNameFilter.IsMatch(self[i].FileName))
	{
	callback.Invoke(self[i], self.Keys[i]);
	}
	}
	}
	}
	}
	}

view raw HttpFileCollectionExtensions.cs hosted with ❤ by GitHub