迭代ModelBindingContext.ValueProvider

Question

我有多个要抓取的属性，该属性以相同的前缀开头，但我只能通过ModelBindingContext.ValueProvider的键来获取确切的值。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，它将绑定到下面的json属性。目前，“设置”上没有名为“启用”的属性，因此它无法正常绑定。

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);
        }
    }

Answer 2

这是一个古老的问题，但是我将发布找到的解决方案。

您可以从请求对象中获取所有提交的键，然后对其进行迭代以获取实际值：

var keys = controllerContext.RequestContext.HttpContext.Request.Form.AllKeys.ToList();

foreach (var key in keys)
{
    var value = bindingContext.ValueProvider.GetValue(key).AttemptedValue;
}