/// <summary>
/// SelectStartsWith.
/// Value instance, when byte[], must stay immutable, please use Dbreeze.Utils.CloneArray
/// </summary>
/// <typeparam name="TValue"></typeparam>
/// <param name="resourceNameStartsWith"></param>
/// <param name="resourceSettings"></param>
/// <returns></returns>
public IEnumerable <KeyValuePair <string, TValue> > SelectStartsWith <TValue>(string resourceNameStartsWith, Settings resourceSettings = null)
{
if (!String.IsNullOrEmpty(resourceNameStartsWith))
{
if (resourceSettings == null)
{
resourceSettings = _defaultSetting;
}
byte[] val = null;
string rn = String.Empty;
byte[] btKey = null;
_sync.EnterUpgradeableReadLock();
btKey = DataTypesConvertor.ConvertKey <string>(_urp + resourceNameStartsWith);
var q = LTrie.IterateForwardStartsWith(btKey, true, false);
if (!resourceSettings.SortingAscending)
{
q = LTrie.IterateBackwardStartsWith(btKey, true, false);
}
foreach (var el in q)
{
rn = el.Key.UTF8_GetString();
if (!_d.TryGetValue(rn, out val))
{
val = el.GetFullValue(false);
if (resourceSettings.HoldInMemory)
{
_sync.EnterWriteLock();
try
{
_d[rn] = val;
}
catch (Exception)
{ }
finally
{
_sync.ExitWriteLock();
}
}
}
//no try..catch for yield return
yield return(new KeyValuePair <string, TValue>(rn.Substring(1), val == null ? default(TValue) : DataTypesConvertor.ConvertBack <TValue>(val)));
}
_sync.ExitUpgradeableReadLock();
}//if is null or
}