How to write the Then clause in a SpecFlow Scenario addressing a method with a Table parameter defining a set of values

Here is how to do it:

1. Define the table in your feature file. Tables are represented by rows and columns in a pipe-delimited (|) format. SpecFlow can automatically identify that a table is being used because it looks like this:

Then the combobox with id "SomeAutomationId" contains the following elements: | values | | Value_1 | | Value_2 | | ... | | Value_n | 

2. Define the step definition. You can pass in the values parameter of type Table as you have done and use it like this:

[Then(@"the combobox with id ([^ ""]+) contained the following elements:")] public void ComboboxContainsValues(AutomationIdString automationId, Table values) { _driver.ValidateComboBoxValues(automationId, values).Should().Be(true); } 

3. Define your validation logic. The idea is I can extract the values information from the rows because I made it a header in my feature file. Then once you have that information you can perform the assertion you need.

public bool ValidateComboBoxValues(AutomationIdString automationId, Table table) { var expectedValues = table.Rows.Select(row => row["values"]).ToList(); //perform assertion against ComboBox values return true; } 

One thing to note, is that I am a bit confused that in your feature file you have passed in the id like "SomeAutomationId" implying you are trying to pass in a string but in your step definition you have referred to it as type AutomationIdString. I would be mindful of this. If you are trying to pass in an object, you cannot do it directly like this in SpecFlow without a parameter transformation. If you are using a string, I would change the type to string in your step definition, and you should be fine.