DateTime time data types in C # how to convert them?

DateTime time data types in C # how to convert them?

文献种类：专题技术文献;
开发工具与关键技术：VS
作者：蛋蛋；
撰写时间：2019/05/23

1. What is dateTime (); What type belong? First DateTime time type followed DateTime equally time type, but may be Null example:?? Int data type, generally can not give a Null value but if you declare int b = 0; b = null ; this assignment can be set up a; DateTime represents the time; accurate to within 100 nanoseconds; then this is a concept of what? A write at any time of the day directly autofill date plus the period of time,
   
   ①date types can be used when required without the need for a time portion of the date value
   ②datetime type: can be used in a Date you need to include the date and time information
   (1 ) omitted Year / month / day and date display system prompts for the new date, you can not modify simply press the enter key to modify directly enter a new date difference between 2: ①date: 'YYYY-MM -DD' format to retrieve MySQL and display date value;
   ②datetime: in the MySQL 'YYYY-mM-DD HH: mm: ss' retrieval and display format DATETIME type.
   Among the display when the database do not represent the view of the project will be able to spread them, you should how to change it? When you need to even check out the table of data that is inconsistent in how to convert the time is not the first to think of ToString () plus whom this conversion behind the filter criteria do not expect to immediately think of contingency table queries to create entity classes Vo; inherit the main field field required then add
   public Nullable <System.DateTime> ReceptionTime {get ; set;}
   had time DateTime type in the main table, but create entity has created a new class named name,
   data type string public string Receptiondate {get; set ;}
   multi-table join as usual, but a pay more filters
   Receptiondate = ( ""); let the first assignment is empty;
   then applying a writing time outside the conversion method dateToString String public (the DateTime Time)
   (! Time = null) {return {IF time.Year + "in" + time. month + "when", "month" + time.Day + "day" + time.Hour + + time.Minute + "min" + time.Second + "seconds";}
   the else {return "no";}
   However, in this the cycle time required to traverse through the loop at time turnover time //
   the foreach (Item in listRelationrecord var)
   {item.Receptiondate dateToString = ((the DateTime) item.ReceptionTime); the foreach loop} is only available in the array, through the array and for each of a key / value for each iteration of the loop, the current values of the array elements will be assigned to the variable $ value, and the array pointer is moved one by one, until the last array element.
   Of course, at this time, although a conversion time can be converted over but can not forget the need to change it back in Html value of tabular data! When the form is submitted the required notice is name value the needs and the database field naming needs to be consistent most common most common and general is to use submit type ... look at the code
   <form name = "form" method = "post" action = "# ">
   <= the INPUT of the type" the submit "name =" the submit "value =" submit ">