public override IGrid ReadGrid(int gridNo)
{
try
{
using (IDbConnection conn = DbConnectionFactory.CreateDbConnection(_dbConnectionString))
{
if (conn == null)//数据库连接已经关闭或链接池没有可用连接
{
return(null);
}
conn.Open();
Envelope evp = _gridStateIndicator.GetEnvelope(gridNo);
Feature[] fets = _reader.Read(evp, conn);
if (fets != null && fets.Length > 0)
{
foreach (Feature f in fets)
{
f.SetFeatureClass(_featureClass);
}
return(new Grid(gridNo, evp, fets));
}
return(new Grid(gridNo, evp, null));
}
}
catch (Exception ex)
{
Log.WriterException(ex);
return(null);
}
}
public Feature[] Read(Envelope envelope)
{
if (_reader == null)
{
Init();
}
if (_reader == null)
{
return(null);
}
try
{
using (IDbConnection dbConn = DbConnectionFactory.CreateDbConnection(_connstring))
{
if (dbConn == null)
{
return(null);
}
dbConn.Open();
return(_reader.Read(envelope, dbConn));
}
}
catch (Exception ex)
{
Log.WriterException(ex);
return(null);
}
}