void PatronClear()
{
_patron.Clear();
if (this.patronControl.BorrowedEntities.Count > 0)
{
if (!Application.Current.Dispatcher.CheckAccess())
{
Application.Current.Dispatcher.Invoke(new Action(() =>
{
this.patronControl.BorrowedEntities.Clear();
}));
}
else
{
this.patronControl.BorrowedEntities.Clear();
}
}
}
void Refresh()
{
if (_rfidChannel == null || _rfidChannel.Started == false)
{
return;
}
// 防止重入
int v = Interlocked.Increment(ref this._inRefresh);
if (v > 1)
{
Interlocked.Decrement(ref this._inRefresh);
return;
}
_cancelRefresh = new CancellationTokenSource();
try
{
// 获得所有协议类型的标签
var result = _rfidChannel.Object.ListTags("*",
null
// "getTagInfo"
);
List <OneTag> books = new List <OneTag>();
List <OneTag> patrons = new List <OneTag>();
// 分离图书标签和读者卡标签
foreach (OneTag tag in result.Results)
{
if (tag.Protocol == InventoryInfo.ISO14443A)
{
patrons.Add(tag);
}
else if (tag.Protocol == InventoryInfo.ISO15693)
{
var gettaginfo_result = GetTagInfo(_rfidChannel, tag.UID);
if (gettaginfo_result.Value == -1)
{
this.Error = gettaginfo_result.ErrorInfo;
continue;
}
TagInfo info = gettaginfo_result.TagInfo;
// 观察 typeOfUsage 元素
var chip = LogicChip.From(info.Bytes,
(int)info.BlockSize,
"");
string typeOfUsage = chip.FindElement(ElementOID.TypeOfUsage)?.Text;
if (typeOfUsage != null && typeOfUsage.StartsWith("8"))
{
patrons.Add(tag);
}
else
{
books.Add(tag);
}
}
else
{
books.Add(tag);
}
}
List <Entity> new_entities = new List <Entity>();
{
// 比较当前集合。对当前集合进行增删改
bool changed = false;
Application.Current.Dispatcher.Invoke(new Action(() =>
{
changed = _entities.Refresh(books, ref new_entities);
}));
if (_entities.Count == 0 &&
changed == true && // 限定为，当数量减少到 0 这一次，才进行清除
_patron.Source == "fingerprint")
{
_patron.Clear();
}
}
// 当列表为空的时候，主动清空一次 tag 缓存。这样读者可以用拿走全部标签一次的方法来迫使清除缓存(比如中途利用内务修改过 RFID 标签的 EAS)
if (_entities.Count == 0 && _tagTable.Count > 0)
{
ClearTagTable(null);
}
if (patrons.Count == 1)
{
_patron.Source = "";
}
if (_patron.Source == "fingerprint")
{
}
else
{
if (patrons.Count > 1)
{
// 读卡器上放了多张读者卡
_patron.Error = "读卡器上放了多张读者卡。请拿走多余的";
}
if (patrons.Count == 1)
{
_patron.Fill(patrons[0]);
}
else
{
_patron.Clear();
}
}
GetPatronFromFingerprint();
FillBookFields();
FillPatronDetail();
CheckEAS(new_entities);
}
catch (Exception ex)
{
this.Error = $"后台刷新过程出现异常: {ex.Message}";
return;
}
finally
{
_cancelRefresh = null;
Interlocked.Decrement(ref this._inRefresh);
}
}