发生异常：-“未将字符串识别为有效的DateTime。 从索引0开始有一个未知词。”

Question

I want to store the DateTime data into the List .I have tried the below code but that throws the above exception. Please suggest some solution.

 SqlDataReader dr;
 con.Open();
 dr = cmd.ExecuteReader();
 List<DateTime> fdate = new List<DateTime>();

 try
    {
        if (dr.HasRows)
        {
            while (dr.Read())
            {
                fdate.Add(Convert.ToDateTime(dr.ToString()));
            }
        }
    }
    catch (Exception)
    {

        throw;
    }

Answer 1

It's been awhile since I worked with DataReaders but don't you have to specify the column name or index? In your code you're trying to convert a DataReader to a DateTime object.

fdate.Add(Convert.ToDateTime(dr.ToString()));

You need to specify the column in the DataReader to convert:

fdate.Add(Convert.ToDateTime(dr["column name"].ToString()));

And even then you're gonna need to check for nulls prior to doing the conversion.