asp.net - 迭代 ModelBindingContext.ValueProvider

Question

我有不止一个属性需要获取，它们以相同的前缀开头，但我只能通过键获得 ModelBindingContext.ValueProvider 的确切值。 .有没有办法获取多个 ValueProvider 或迭代 System.Web.Mvc.DictionaryValueProvider<object> ？

 var value = bindingContext.ValueProvider.GetValue(propertyDescriptor.Name);

这样做的原因是一个名为 Settings 的动态属性，它将绑定(bind)到下面的 json 属性。现在设置上没有名为“启用”的属性，因此它不能正常绑定(bind)。

public class Integration
{
      public dynamic Settings {get;set;}
}

"Integrations[0].Settings.Enable": "true"
"Integrations[0].Settings.Name": "Will"

Answer 1

知道了

 public class DynamicPropertyBinder : PropertyBinderAttribute
    {
        public override bool BindProperty(ControllerContext controllerContext, ModelBindingContext bindingContext, PropertyDescriptor propertyDescriptor)
        {
            if (propertyDescriptor.PropertyType == typeof(Object))
            {
                foreach(var valueProvider in bindingContext.ValueProvider as System.Collections.IList)
                {
                    var dictionary = valueProvider as DictionaryValueProvider<object>;

                    if (dictionary != null)
                    {
                        var keys = dictionary.GetKeysFromPrefix($"{bindingContext.ModelName}.{propertyDescriptor.Name}");

                        if (keys.Any())
                        {
                            var expando = new ExpandoObject();

                            foreach (var key in keys)
                            {
                                var keyValue = dictionary.GetValue(key.Value);

                                if (keyValue != null)
                                {
                                    AddProperty(expando, key.Key, keyValue.RawValue);

                                }
                            }

                            propertyDescriptor.SetValue(bindingContext.Model, expando);
                            return true;
                        }
                    }
                }
            }

            return false;
        }

        public static void AddProperty(ExpandoObject expando, string propertyName, object propertyValue)
        {
            var expandoDict = expando as IDictionary<string, object>;
            if (expandoDict.ContainsKey(propertyName))
                expandoDict[propertyName] = propertyValue;
            else
                expandoDict.Add(propertyName, propertyValue);
        }
    }