async Task Present()
{
PresentDialog dlg = new PresentDialog();
dlg.UiState = _uiState;
dlg.ShowDialog(this);
_uiState = dlg.UiState;
if (dlg.DialogResult == DialogResult.Cancel)
{
return;
}
int nStart = Convert.ToInt32(dlg.PresentStart);
int nCount = Convert.ToInt32(dlg.PresentCount);
EnableControls(false); // 暂时禁用
try
{
PresentResult present_result = await _zclient.Present(
dlg.ResultSetName,
nStart,
nCount,
1000, // 10
"F",
_targetInfo.PreferredRecordSyntax);
if (present_result.Value == -1)
{
this.Invoke((Action)(() => MessageBox.Show(this, present_result.ToString())));
}
else
{
// 把 MARC 记录显示出来
AppendMarcRecords(present_result.Records,
_zclient.ForcedRecordsEncoding == null ? _targetInfo.DefaultRecordsEncoding : _zclient.ForcedRecordsEncoding,
_fetched);
if (present_result.Records != null)
{
_fetched += present_result.Records.Count;
}
}
}
finally
{
EnableControls(true);
}
}
async Task FetchRecords(TargetInfo targetinfo)
{
EnableControls(false); // 暂时禁用
try
{
if (_resultCount - _fetched > 0)
{
PresentResult present_result = await _zclient.Present(
"default",
_fetched,
Math.Min((int)_resultCount - _fetched, 10),
10,
"F",
targetinfo.PreferredRecordSyntax);
if (present_result.Value == -1)
{
this.Invoke((Action)(() => MessageBox.Show(this, present_result.ToString())));
}
else
{
// 把 MARC 记录显示出来
AppendMarcRecords(present_result.Records,
_zclient.ForcedRecordsEncoding == null ? targetinfo.DefaultRecordsEncoding : _zclient.ForcedRecordsEncoding,
_fetched);
_fetched += present_result.Records.Count;
}
}
}
finally
{
EnableControls(true);
}
#if NO
if (_resultCount - _fetched > 0)
{
this.button_nextBatch.Enabled = true;
}
else
{
this.button_nextBatch.Enabled = false;
}
this.button_nextBatch.Text = ">> " + _fetched + "/" + _resultCount;
#endif
}
// 获得记录
// 确保一定可以获得nCount个
// parameters:
// nStart 获取记录的开始位置(从0开始计数)
// nPreferedEachCount 推荐的每次条数。这涉及到响应的敏捷性。如果为-1或者0，表示最大
public async Task <PresentResult> Present(
string strResultSetName,
int nStart,
int nCount,
int nPreferedEachCount, // 推荐的每次条数。这涉及到响应的敏捷性
string strElementSetName,
string strPreferredRecordSyntax)
{
if (nCount == 0)
{
return new PresentResult {
Value = 0, ErrorInfo = "nCount 参数为 0，本次没有真正请求服务器获取记录"
}
}
;
RecordCollection records = new RecordCollection();
int nGeted = 0;
for (; ;)
{
int nPerCount = 0;
if (nPreferedEachCount == -1 || nPreferedEachCount == 0)
{
nPerCount = nCount - nGeted;
}
else
{
nPerCount = Math.Min(nPreferedEachCount, nCount - nGeted);
}
// this.Stop.SetMessage("正在获取命中结果 ( " + (nStart + nGeted + 1).ToString() + "-" + (nStart + nGeted + nPerCount).ToString() + " of " + this.ResultCount + " ) ...");
// RecordCollection temprecords = null;
PresentResult result = await OncePresent(
strResultSetName,
nStart + nGeted,
nPerCount,
strElementSetName,
strPreferredRecordSyntax);
if (result.Value == -1)
{
return(result);
}
if (result.Records == null)
{
break;
}
nGeted += result.Records.Count;
if (result.Records.Count > 0)
{
records.AddRange(result.Records);
}
if (nGeted >= nCount || result.Records.Count == 0)
{
break;
}
}
return(new PresentResult {
Records = records
});
}
