标签：not datarow project question ast data instead www tps
dt.Columns.Add("EffectiveDate", typeof(DateTime));
DateTime? effectivedate=null;
if (lastRow["Effective_x0020_Date"] != DBNull.Value)
{
effectivedate = Convert.ToDateTime(lastRow["Effective_x0020_Date"]);
}
DataRow dr = dt.NewRow();
dr["EffectiveDate"] = effectivedate;
dt.Rows.Add(dr);
Fix
dr["EffectiveDate"] = effectivedate ?? (object)DBNull.Value;
来源：https://www.codeproject.com/Questions/867120/Cannot-set-Column-EffectiveDate-to-be-null-Please
Cannot set Column 'EffectiveDate' to be null. Please use DBNull instead.
标签：not datarow project question ast data instead www tps
原文地址：https://www.cnblogs.com/shy1766IT/p/13809711.html
