Question

datatable.Rows[0]["abc"]怎么判断是不是null 或者是不是空值

DataTable dtc = CityManager.GetTableCityTypeId(Convert.ToInt32(Id));
if (dtc.Rows.Count > 0)
{
if (dtc.Rows[0]["CityName"] == null || dtc.Rows[0]["CityName"].ToString() == "")
{
City1 = "";
}
else
{
City1 = dtc.Rows[0]["CityName"].ToString();
CityId1 = dtc.Rows[0]["CityId"].ToString();
}
if (dtc.Rows[1]["CityName"] == null || dtc.Rows[1]["CityName"].ToString() == "")
{
City2 = "";
}
else
{
City2 = dtc.Rows[1]["CityName"].ToString();
CityId2 = dtc.Rows[1]["CityId"].ToString();
} }

dtc.Rows[1]["CityName"] == null || dtc.Rows[1]["CityName"].ToString() == ""
这样不好使？？？怎么判断好使

Answer 1

dtc.Rows[1].IsNull("CityName") == true

Answer 2

String.IsNullOrWhiteSpace

追问

帮个忙 写全点 怎么写 在页面怎么判断 不是在sql语句上写

追答

if (String.IsNullOrWhiteSpace(dtc.Rows[1]["CityName"]))
{
}else

{
}