Convert custom action filter for Web API use?

Question

I found a really nice action filter that converts a comma-separated parameter to a generic type list: http://stevescodingblog.co.uk/fun-with-action-filters/

I would

Answer 1

Here is another way:

public class ConvertCommaDelimitedList : CollectionModelBinder
{
    public override bool BindModel(HttpActionContext actionContext, ModelBindingContext bindingContext)
   {
       var _queryName = HttpUtility.ParseQueryString(actionContext.Request.RequestUri.Query)[bindingContext.ModelName];
        List _model = new List();
        if (!String.IsNullOrEmpty(_queryName))
            _model = _queryName.Split(',').ToList();

        var converter = TypeDescriptor.GetConverter(typeof(T));
        if (converter != null)
            bindingContext.Model = _model.ConvertAll(m => (T)converter.ConvertFromString(m));
        else
            bindingContext.Model = _model;

        return true;
    }
}

And list your param in the ApiController ActionMethod:

[ModelBinder(typeof(ConvertCommaDelimitedList))] List StudentIds = null)

Where StudentIds is the querystring param (&StudentIds=1,2,4)