如何將數據表格日期轉換爲特定字符串格式

Question

string actionDate = ((DateTime) objActionDescr.GetDataTable().Rows[0]["ActionDate"]).ToString("MM"); 

錯誤如我無效投射出來。請幫助

Answer 1

首先，檢查值是否爲空，然後將其轉換爲您需要的任何格式。 類似這樣的：

//first, check if that column contains value 
if (!objActionDescr.GetDataTable().Rows[0].IsNull("ActionDate")) 
{ 
    //if value is there, do with it what you need... 

    //this will return month name, -> like August 
    string actionDateMonth = (Convert.ToDateTime(objActionDescr.GetDataTable().Rows[0]["ActionDate"])).ToString("MM"); 
    //this will return month number -> like 08 
    string actionDateMonthNumber = (Convert.ToDateTime(objActionDescr.GetDataTable().Rows[0]["ActionDate"])).ToString("mm"); 
    //same as above 
    actionDateMonthNumber = (Convert.ToDateTime(objActionDescr.GetDataTable().Rows[0]["ActionDate"])).Month.ToString(); 
}