public override bool Contains(string key, string regionName = null)
{
if (key == null)
{
throw new ArgumentNullException("The parameter key must not be null.");
}
if (regionName != null)
{
throw new NotSupportedException("The parameter regionName must be null.");
}
if (fileDb.IsOpen)
{
try
{
return(fileDb.GetRecordByKey(key, new string[0], false) != null);
}
catch (Exception ex)
{
Debug.WriteLine("FileDbCache: FileDb.GetRecordByKey(\"{0}\"): {1}", key, ex.Message);
}
}
return(false);
}
private Record GetRecordByKey(string key)
{
try
{
return(fileDb.GetRecordByKey(key, new string[] { valueField, expiresField }, false));
}
catch (Exception ex)
{
Debug.WriteLine("FileDbCache.GetRecordByKey(\"{0}\"): {1}", key, ex.Message);
}
return(null);
}
private ImageCacheItem Get(string key)
{
var fields = new string[] { valueField, expiresField };
Record record = null;
try
{
record = fileDb.GetRecordByKey(key, fields, false);
}
catch (Exception ex)
{
Debug.WriteLine("FileDbCache: FileDb.GetRecordByKey(\"{0}\") failed: {1}", key, ex.Message);
}
if (record != null)
{
try
{
return(new ImageCacheItem
{
Buffer = ((byte[])record[0]).AsBuffer(),
Expires = (DateTime)record[1]
});
}
catch (Exception ex)
{
Debug.WriteLine("FileDbCache: Decoding \"{0}\" failed: {1}", key, ex.Message);
}
try
{
fileDb.DeleteRecordByKey(key);
}
catch (Exception ex)
{
Debug.WriteLine("FileDbCache: FileDb.DeleteRecordByKey(\"{0}\") failed: {1}", key, ex.Message);
}
}
return(null);
}
private void BtnGetRecordByKey_Click(object sender, RoutedEventArgs e)
{
try
{
Record record = _db.GetRecordByKey(3, new string[] { "ID", "Firstname", "LastName" }, false);
Records records = new Records(1);
records.Add(record);
displayRecords(records);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
