/// <summary>
/// Removing oldest cache file (file, which last access time is smaller)
/// </summary>
private async Task <bool> RemoveOldestCacheFile()
{
if (_lastAccessTimeDictionary.Count == 0)
{
return(false);
}
var oldestCacheFilePath = _lastAccessTimeDictionary.Aggregate((pair1, pair2) => (pair1.Value < pair2.Value) ? pair1 : pair2).Key;
if (string.IsNullOrEmpty(oldestCacheFilePath))
{
return(false);
}
oldestCacheFilePath = Path.Combine(CacheDirectory, oldestCacheFilePath);
try
{
long fileSizeInBytes;
var storageFile = await SF.GetFileAsync(oldestCacheFilePath);
var properties = await storageFile.GetBasicPropertiesAsync();
fileSizeInBytes = (long)properties.Size;
try
{
await storageFile.DeleteAsync();
_lastAccessTimeDictionary.Remove(oldestCacheFilePath);
CurrentCacheSizeInBytes -= fileSizeInBytes; // Updating current cache size
ImageLog.Log("[delete] cache file " + oldestCacheFilePath);
return(true);
}
catch
{
ImageLog.Log("[error] can not delete oldest cache file: " + oldestCacheFilePath);
}
}
catch (Exception)
{
ImageLog.Log("[error] can not get olders cache's file size: " + oldestCacheFilePath);
}
return(false);
}