server/aspnetapp/Helper/MimeMapping.cs

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using System;
using System.Collections.Generic;
using System.IO;

namespace aspnetapp.Helper
{
    public static class MimeMapping
    {
        private abstract class MimeMappingDictionaryBase
        {
            private readonly Dictionary<string, string> _mappings = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);

            private static readonly char[] _pathSeparatorChars = new char[3]
            {
                Path.DirectorySeparatorChar,
                Path.AltDirectorySeparatorChar,
                Path.VolumeSeparatorChar
            };

            private bool _isInitialized;

            protected void AddMapping(string fileExtension, string mimeType)
            {
                _mappings.Add(fileExtension, mimeType);
            }

            private void AddWildcardIfNotPresent()
            {
                if (!_mappings.ContainsKey(".*"))
                {
                    AddMapping(".*", "application/octet-stream");
                }
            }

            private void EnsureMapping()
            {
                if (!_isInitialized)
                {
                    lock (this)
                    {
                        if (!_isInitialized)
                        {
                            PopulateMappings();
                            AddWildcardIfNotPresent();
                            _isInitialized = true;
                        }
                    }
                }
            }

            protected abstract void PopulateMappings();

            private static string GetFileName(string path)
            {
                int num = path.LastIndexOfAny(_pathSeparatorChars);
                if (num < 0)
                {
                    return path;
                }
                return path.Substring(num);