序列化：DateTime.Now VS DateTime 来自数据库

Question

Context: I'm serializing some data that includes a date of which I need to display milliseconds. I'm using a XmlSerializer to write an XML file. I'm taking some data from a database using a DataTable.

What I'm actually doing: I cast the date in this way

CDate(dr("MyDate")).ToUniversalTime()

But once serialized this does not includes milliseconds.

While trying some workarounds I've found out that serialize in the same way

DateTime.Now.ToUniversalTime()

does includes milliseconds.

Actual question: what should I do to include milliseconds while serializing dr("MyDate")?

Please note that answers in VB.NET or C# are both well accepted.

Answer 1

Have you checked, what CDate contains? For exmaple Definition of CDate shows that CDate contains only seconds, not milliseconds. When the original time in the database is stored in text format (with milliseconds) you should use DateTime.TryParseExact(...) to get the complete time value. Otherwise, when the database itself uses another DateTime-class, you should use this type directly to convert to datetime.