How to check given date is in MM/DD/YYYY format

[Dominic]

Sharing this from my past learning,

Why it didn’t work in Assign/IF activity?

Pass by Reference Variable is not getting set in TryParseExact method

This might shed some light, although the topic is quite old I think it’s still relevant: In short - WWF uses different allocation schemes (context) than traditional .Net. For most common ones (f.e. dates) Microsoft has supplied some supplementary packages (check your available packages for Workflow Manager Activities and Microsoft.Activities.Extensions). For the rest you’ll need a combination of InvokeMethod, InvokeCode (if you have a version that supports it) and/or custom activities.

How can we resolve ? Existing sample for Double.TryParse

Academy 2 - Walkthrough – UiDemo - TryParse

Hello María, [image] This method stores the result value in a variable that has to be passed as reference. Variables don’t have the concept of in/out as arguments in WF. They don’t implement implicit operators so the result will never be stored as you wish. If you need the value you can use InvokeMethod, here is an example: TEST_DOUBLE_TRYPARSE.zip (2.1 KB) Regards, Susana

Solution: Use TryParseExact/TryParse in Invoke Code/Method

Date_TryParseExact_InvokeMethod.xaml (13.5 KB)

Note: You can also use TryParse for your requirement

MSDN References:

1. DateTime.TryParse Method (String, DateTime)
2. DateTime.TryParseExact Method (String, String[], IFormatProvider, DateTimeStyles, DateTime)