Question

On both examples I’m giving it a String like the following: 26-03-17

Dim mvarValor As String
Dim dateVarValor As DateTime

This code snippet is throwing an exception on the TryParse:

If Not mvarValor = Nothing AndAlso DateTime.TryParse(mvarValor, dateVarValor) Then
    Return Format(dateVarValor, mvarFormat)
Else
    Return strNull
End If

The next code snippet is not throwing an exception, but a False like it should:

DateTime.TryParse(mvarValor, dateVarValor)
If dateVarValor = Nothing Then
    Return strNull
Else
    Return Format(dateVarValor, mvarFormat)
End If

Why is the first code snippet giving me an exception?

Thanks in advance!

Answer 1

DateTime.TryParse throws three types of exceptions

http://msdn.microsoft.com/en-us/library/9h21f14e(v=vs.100).aspx

you must be getting one of those. Here is the proper usage of DateTime.TryParse

var culture = CultureInfo.CreateSpecificCulture("en-US");

string parsedDateTime = null;

if (DateTime.TryParse(parseMe, culture, DateTimeStyles.None, out dateResult))
{
    parsedDateTime = dateResult;
}

this snippet will parse the datetime without throwing an exception.

I hope this helps 🙂