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namespace System.Web.Mvc {
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
public sealed class HttpFileCollectionValueProvider : DictionaryValueProvider<HttpPostedFileBase[]> {
private static readonly Dictionary<string, HttpPostedFileBase[]> _emptyDictionary = new Dictionary<string, HttpPostedFileBase[]>();
public HttpFileCollectionValueProvider(ControllerContext controllerContext)
: base(GetHttpPostedFileDictionary(controllerContext), CultureInfo.InvariantCulture) {
}
private static Dictionary<string, HttpPostedFileBase[]> GetHttpPostedFileDictionary(ControllerContext controllerContext) {
HttpFileCollectionBase files = controllerContext.HttpContext.Request.Files;
// fast-track common case of no files
if (files.Count == 0) {
return _emptyDictionary;
}
// build up the 1:many file mapping
List<KeyValuePair<string, HttpPostedFileBase>> mapping = new List<KeyValuePair<string, HttpPostedFileBase>>();
string[] allKeys = files.AllKeys;
for (int i = 0; i < files.Count; i++) {
string key = allKeys[i];
if (key != null) {
HttpPostedFileBase file = HttpPostedFileBaseModelBinder.ChooseFileOrNull(files[i]);
mapping.Add(new KeyValuePair<string, HttpPostedFileBase>(key, file));
}
}
// turn the mapping into a 1:many dictionary
var grouped = mapping.GroupBy(el => el.Key, el => el.Value, StringComparer.OrdinalIgnoreCase);
return grouped.ToDictionary(g => g.Key, g => g.ToArray(), StringComparer.OrdinalIgnoreCase);
}
}
}
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