Image Cache : Image « 2D Graphics « C# / C Sharp






Image Cache

       
using System.Collections.Generic;
using System.Linq;
using System.Windows.Media;

namespace Photoviewer.Common
{
    public static class ImageCache
    {
        private static readonly Dictionary<string, ImageSource> _cacheEntries;
        private static readonly int _maxEntries;

        static ImageCache()
        {
            _cacheEntries = new Dictionary<string, ImageSource>();
            _maxEntries = 10;
        }

        /// <summary>
        /// Gets a cached version of an image source
        /// specified by the key
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static ImageSource GetCachedImageSource(string key)
        {
            ImageSource source = null;

            if (_cacheEntries.ContainsKey(key))
                source = _cacheEntries[key];

            return source;
        }

        /// <summary>
        /// Saves an image source in the image cache
        /// </summary>
        /// <param name="key"></param>
        /// <param name="source"></param>
        public static void SaveImageSourceInCache(string key, ImageSource source)
        {
            if (_cacheEntries.ContainsKey(key))
            {
                _cacheEntries[key] = source;
                return;
            }

            if (_cacheEntries.Count + 1 > _maxEntries)
            {
                _cacheEntries.Remove(_cacheEntries.Keys.First());
            }

            _cacheEntries.Add(key, source);
        }
    }
}

   
    
    
    
    
    
    
  








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