企业库读取数据错误

[fangbin678]

[code=C#][/using System.Text;
using Microsoft.Practices.EnterpriseLibrary.Data;
using System.Data.SqlClient;
using System.Data.Common;
using System.Data;
using Model;
public List<user> GetModelList(string strWhere)
{
StringBuilder sb = new StringBuilder();
sb.Append("select * from QX_User");
if (strWhere.Trim() !="")
{
sb.Append(" where 1=1"+strWhere);
}
List<user> list = new List<user>();
Database db = DatabaseFactory.CreateDatabase();
using (DbConnection connection = db.CreateConnection())
{
connection.Open();

using (IDataReader datareader = db.ExecuteReader(CommandType.Text, sb.ToString()))
{
while (datareader.Read())
{
list.Add(ReaderBind(datareader));
}
}

connection.Close();
}
return list;
}
[code]
每次执行到Database db = DatabaseFactory.CreateDatabase();总是报未将对象引用到对象事例的错误，请问是什么原因，请大家帮帮忙。

[一片冰心在玉壶]

DatabaseFactory 为null了。。
断点追踪

[ronadozj]

未将对象引用到对象事例 数据为空了