JsonValueProviderFactory

JsonValueProviderFactory.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Web.Mvc;
using System.Web.Script.Serialization;

public class JsonValueProviderFactory : ValueProviderFactory
{
    public JsonValueProviderFactory(string keyName, Type modelType)
    {
        KeyName = keyName;
        ModelType = modelType;
    }

    private string KeyName { get; set; }

    private Type ModelType { get; set; }

    private static void BuildMyValueProvider(Dictionary<string, object> valueProvider, string prefix, object value)
    {
        var d = value as IDictionary<string, object>;
        if (d != null)
        {
            foreach (var entry in d)
            {
                BuildMyValueProvider(valueProvider, GetPropertyKey(prefix, entry.Key), entry.Value);
            }
            return;
        }
        var l = value as IList;
        if (l != null)
        {
            for (int i = 0; i < l.Count; i++)
            {
                BuildMyValueProvider(valueProvider, GetArrayKey(prefix, i), l[i]);
            }
            return;
        }
        valueProvider[prefix] = value;
    }

    private object GetDeserializedJson(ControllerContext controllerContext)
    {
        string jsonText = controllerContext.HttpContext.Request[KeyName];
        if (String.IsNullOrEmpty(jsonText))
        {
            return null;
        }
        var serializer = new JavaScriptSerializer();
        object jsonData = serializer.DeserializeObject(jsonText);
        return jsonData;
    }

    public override IValueProvider GetValueProvider(ControllerContext controllerContext)
    {
        var valueProvider = new Dictionary<string, object>(StringComparer.OrdinalIgnoreCase);

        object jsonData = GetDeserializedJson(controllerContext);
        if (jsonData != null)
        {
            BuildMyValueProvider(valueProvider, String.Empty, jsonData);
        }

        BuildMyValueProvider(valueProvider, String.Empty, jsonData);
        return new DictionaryValueProvider<object>(valueProvider, CultureInfo.CurrentCulture);
    }

    private static string GetArrayKey(string prefix, int index)
    {
        return prefix + "[" + index.ToString(CultureInfo.InvariantCulture) + "]";
    }

    private static string GetPropertyKey(string prefix, string propertyName)
    {
        return (String.IsNullOrEmpty(prefix)) ? propertyName : prefix + "." + propertyName;
    }
}