I have two document types:

1. FormSubmission
2. FormField

The Form document type has a property named Fields which is a Nested Content data type that contains a list of FormField document types. I am trying to programmatically (in a SurfaceController) create a FormField and add it to the Fields property of the Form document type.

Here is the code I am trying to use to do this:

var newFormFields = new List<Umbraco.Core.Models.IContent>();
int i = 0;
foreach (var formField in model.Fields)
{
    string fieldName = string.Format("Field {0}", i);
    var newFormField = contentService.CreateContent(fieldName, newFormSubmission.Id, "formFieldSubmission", formNode.CreatorId);
    newFormField.SetValue("fieldName", formField.Name);
    newFormField.SetValue("fieldType", formField.Type);
    newFormField.SetValue("manditory", formField.Manditory);
    newFormField.SetValue("fieldValue", formField.Value);
    newFormFields.Add(newFormField);
    ++i;
}

newFormSubmission.SetValue("fields", newFormFields);

var status = contentService.SaveAndPublishWithStatus(newFormSubmission, formNode.CreatorId, raiseEvents: false);

On the newFormSubmission.SetValue("fields", newFormFields); line it throws this exception:

The best overloaded method match for 'Umbraco.Core.Models.ContentBase.SetPropertyValue(string, string)' has some invalid arguments

Anyone have any ideas how to store a list of DocumentTypes in the Nested Content data type?

PS: I am using Umbraco version 7.4.0 assembly: 1.0.5885.31226