trypreCount=myReader["SUMS"].ToString().Trim();
preCounts=preCounts + preCount == ""? 0: int.Parse(preCount);orpreCount= myReader["SUMS"] == DBNull.Value? 0: System.Convert.ToInt32(myReader["SUMS"]);
preCounts=preCounts + preCount;
preCounts=preCounts + preCount == ""? 0: int.Parse(preCount);orpreCount= myReader["SUMS"] == DBNull.Value? 0: System.Convert.ToInt32(myReader["SUMS"]);
preCounts=preCounts + preCount;
preCount=System.Convert.ToInt32(myReader["SUMS"]);
前
判断一下:
if(myReader["SUMS"]==DbNull.Value)
preCount=0;
else
preCount=System.Convert.ToInt32(myReader["SUMS"]);
不久完了么?