Model Binders for MongoDB ObjectIds

gistfile1.cs

namespace Web.Serializers
{
    using System;
    using System.Collections.Generic;
    using System.Web.Mvc;
    using MongoDB.Bson;

    public class ObjectIdModelBinder : DefaultModelBinder
    {
        public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            var result = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
            if (result == null)
            {
                return ObjectId.Empty;
            }

            var parsed = ObjectId.Empty;
            return ObjectId.TryParse((string)result.ConvertTo(typeof(string)), out parsed) ? parsed : ObjectId.Empty;
        }
    }

    public class ListObjectIdModelBinder : DefaultModelBinder
    {
        public override object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            var retVal = new List<ObjectId>();
            var result = bindingContext.ValueProvider.GetValue(bindingContext.ModelName);
            if (result == null || result.RawValue == string.Empty || ((string[])result.RawValue)[0] == string.Empty)
            {
                return retVal;
            }

            foreach (var objectId in ((string[])result.RawValue))
            {
                var parsed = ObjectId.Empty;
                retVal.Add(
                    ObjectId.TryParse(objectId, out parsed) ? parsed : ObjectId.Empty);                
            }
            return retVal;
        }
    }

}