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