Dropdown of activity property in Custom Activity

[makattar]

Hi ,
I am creating a custom activity where i wants to create a activity property.That activity property will have a value of type string.But I wants to show as dropdown in designer where user selects values from dropdown.

[sfmskywalker]

You can achieve that by applying the "dropdown" UI hint. This is what the Send HTTP Request does:

/// <summary>
/// The HTTP method to use.
/// </summary>
[ActivityInput(
  UIHint = ActivityInputUIHints.Dropdown,
  Hint = "The HTTP method to use when making the request.",
  Options = new[] { "GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS", "HEAD" },
  SupportedSyntaxes = new[] { SyntaxNames.JavaScript, SyntaxNames.Liquid }
)]
public string? Method { get; set; }

Notice that the Method property is of type string and that a finite set of options are provided from which the user can select one.
If you have a dynamic set of options that you want to provide at runtime, use the OptionsProvider property instead, which must be a Type that implements IActivityPropertyOptionsProvider, from which you return a collection of either string or SelectListItem objects.

For example:

[ActivityInput(
  UIHint = ActivityInputUIHints.Dropdown,
  Hint = "The HTTP method to use when making the request.",
  OptionsProvider = typeof(MyOptionsProvider),
  SupportedSyntaxes = new[] { SyntaxNames.JavaScript, SyntaxNames.Liquid }
)]
public string? Method { get; set; }

public class MyOptionsProvider : IActivityPropertyOptionsProvider
{
   public object GetOptions(PropertyInfo property) => new[] { "GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS", "HEAD" };
}

[srihariraovadlani]

GetOptions method is being called when the process is initialized, i would need to refresh the data by calling API whenever designer is opened. understood that IRuntimeSelectListItemsProvider is solution for it. Can you please share code snippet on how to use it.

Appreciate your help!

[makattar]

I don't know exactly answer of it because I tried hard-coded string there But I think you can use asyn await syntax of c#.Just put that async code (Call to api) assigned to getoptions method.

[makattar]

Can you please tell me in which namespace ActivityInput Resides.Intellisense not giving any suggestions there.

[sfmskywalker]

Ah sorry, ActivityInputPropertyAttribute exists only in 2.1. In 2.0, the attribute is called ActivityPropertyAttribute.

I don’t know off hand the namespace (not sitting behind a big screen yet), but you should be able to find it now. If not, let me know.

[makattar]

Ok sir...I will try it...Thank you

[makattar]

I tried to implement it but It shows error messages on UIHint = ActivityInputUIHints.Dropdown . Means ActivityInputUIHints not defined.

[sfmskywalker]

Can you try ActivityPropertyUIHints instead?

[makattar]

Thanks Sir.It worked.
Please also help me on #1248