对象必须实现 IConvertible错误

Question

看以下代码,一直过不去,是什么原因
 public DataSet GetArriveAnalysis(DateTime dStart,DateTime dEnd, ref int rowsCount)
        {            
            Database db = DatabaseFactory.CreateDatabase("PODDB");
            SqlParameter[] parameters = {
new SqlParameter("@PickDateStart", SqlDbType.DateTime),
                new SqlParameter("@PickDateEnd",SqlDbType.DateTime)
            };
            parameters[0].Value = dStart;
            parameters[1].Value = dEnd;
            DataSet ds = db.ExecuteDataSet("sp_ArriveAnalysis",parameters); //就是这行报错,错误如题
            rowsCount = ds.Tables[0].Rows.Count;
            return ds;
        }存储过程如下:
ALTER PROCEDURE [dbo].[sp_ArriveAnalysis]
@PickDateStart datetime,
@PickDateEnd datetime
AS
BEGIN
 select TargetCity,Sum(Weight),Count(DONo) from t_UploadForm where pickdate>=@PickDateStart and PickDate<=@PickDateEnd 
 group by TargetCity select * from #ret
END

Answer 1

代码不全。。ExecuteDataSet内部是怎样实现的

Answer 2

Database 的ExecuteDataSet返回的类型与dataset不兼容