动态解析 DateTime.TryParseExact 中的毫秒数

Question

I was wondering if it is possible to parse milliseconds dynamically?

Currently I have

 if (DateTime.TryParseExact(Value, "M/d/yyyy HH:mm:ss.ffffff", null, System.Globalization.DateTimeStyles.None, out startDate))

but this forces me to always pass 6 milliseconds. How do I allow the parsing to parse 3 milliseconds if passed?

Answer 1

You can pass an array of allowed formats to TryParseExact :

string[] allowedFormats = { "M/d/yyyy HH:mm:ss.ffffff", "M/d/yyyy HH:mm:ss.fff" };
string Value = "2/15/2018 16:58:46.456";
DateTime startDate;
if (DateTime.TryParseExact(Value, allowedFormats, CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None, out startDate))
{
    Console.WriteLine(Value);
}