/// <summary>
/// 动态Sql拼接，
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="where"></param>
/// <param name="args"></param>
/// <returns></returns>
public WhereHelper <T> Where <T>(string where, params object[] args) where T : class, new()
{
var whereHelper = new WhereHelper <T>(this);
if (string.IsNullOrEmpty(where))
{
throw new ArgumentNullException("where");
}
whereHelper.where (where, args);
return(whereHelper);
}