[Ado.Net]将数据(MSSQL)查询结果填充到ILIST<T>

private static IList<T> QueryDbToList<T>(string _sql) where T : class,new()
{
IList<T> _lsModels = new List<T>();
using (SqlConnection _sqlcon = new SqlConnection(sConStr))
{
try
{
_sqlcon.Open();
using (SqlCommand _sqlcmd = new SqlCommand(_sql, _sqlcon))
{
using (IDataReader _ireader = _sqlcmd.ExecuteReader())
{
//Hashtable _hsDbColumns = ProcessDbColumnToHashTable(_ireader);
while (_ireader.Read())
{
Object _objT = Activator.CreateInstance<T>();
for (int j = 0; j < _ireader.FieldCount; j++)
{
string _sPName = _ireader.GetName(j);
int _nPIndex = _ireader.GetOrdinal(_sPName);
if (_nPIndex == -1) continue;
object _objPValue = _ireader.GetValue(_nPIndex);
if (_objPValue == DBNull.Value) continue;
PropertyInfo _propertyInfo = _objT.GetType().GetProperty(_sPName);
if (_propertyInfo != null)
_propertyInfo.SetValue(_objT, _objPValue, null);
}
_lsModels.Add((T)_objT);
/* 第二种方法
Object _objT = Activator.CreateInstance<T>();
PropertyInfo[] _objPropertyInfos = _objT.GetType().GetProperties();
foreach (PropertyInfo _p in _objPropertyInfos)
{
string _sPName = _p.Name;
if (!_hsDbColumns.ContainsKey(_sPName.ToUpper())) continue;
int _nPIndex = _ireader.GetOrdinal(_sPName);
if (_nPIndex == -1) continue;
object _objPValue = _ireader.GetValue(_nPIndex);
if (_objPValue != DBNull.Value)
_p.SetValue(_objT, _objPValue, null);
}
_lsModels.Add((T)_objT);
*/
}
}
}
}
catch
{
return null;
}
finally
{
if (_sqlcon.State != ConnectionState.Closed)
_sqlcon.Close();
}
}
return _lsModels;
}

private static Hashtable ProcessDbColumnToHashTable(IDataReader _ireader)
{
if (_ireader != null)
{
int _nDbColumnCount = _ireader.FieldCount;
Hashtable _hsDbColumns = new Hashtable();
for (int i = 0; i < _nDbColumnCount; i++)
{
string _sFiledName = _ireader.GetName(i).ToUpper();
if (!_hsDbColumns.ContainsKey(_sFiledName))
_hsDbColumns.Add(_sFiledName, _sFiledName);
}
return _hsDbColumns;
}
return null;
}

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