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    <p>If you are happy to have a dependency upon the <code>System.Web.Helpers</code> assembly, then you can use the <a href="http://msdn.microsoft.com/en-us/library/system.web.helpers.json(v=vs.111).aspx" rel="noreferrer"><code>Json</code></a> class:</p> <pre><code>dynamic data = Json.Decode(json); </code></pre> <p>It is included with the MVC framework as an <a href="https://stackoverflow.com/q/8037895/24874">additional download</a> to the .NET 4 framework. Be sure to give Vlad an upvote if that's helpful! However if you cannot assume the client environment includes this DLL, then read on.</p> <hr> <p>An alternative deserialisation approach is suggested <a href="http://www.drowningintechnicaldebt.com/ShawnWeisfeld/archive/2010/08/22/using-c-4.0-and-dynamic-to-parse-json.aspx" rel="noreferrer">here</a>. I modified the code slightly to fix a bug and suit my coding style. All you need is this code and a reference to <code>System.Web.Extensions</code> from your project:</p> <pre><code>using System; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Dynamic; using System.Linq; using System.Text; using System.Web.Script.Serialization; public sealed class DynamicJsonConverter : JavaScriptConverter { public override object Deserialize(IDictionary&lt;string, object&gt; dictionary, Type type, JavaScriptSerializer serializer) { if (dictionary == null) throw new ArgumentNullException("dictionary"); return type == typeof(object) ? new DynamicJsonObject(dictionary) : null; } public override IDictionary&lt;string, object&gt; Serialize(object obj, JavaScriptSerializer serializer) { throw new NotImplementedException(); } public override IEnumerable&lt;Type&gt; SupportedTypes { get { return new ReadOnlyCollection&lt;Type&gt;(new List&lt;Type&gt;(new[] { typeof(object) })); } } #region Nested type: DynamicJsonObject private sealed class DynamicJsonObject : DynamicObject { private readonly IDictionary&lt;string, object&gt; _dictionary; public DynamicJsonObject(IDictionary&lt;string, object&gt; dictionary) { if (dictionary == null) throw new ArgumentNullException("dictionary"); _dictionary = dictionary; } public override string ToString() { var sb = new StringBuilder("{"); ToString(sb); return sb.ToString(); } private void ToString(StringBuilder sb) { var firstInDictionary = true; foreach (var pair in _dictionary) { if (!firstInDictionary) sb.Append(","); firstInDictionary = false; var value = pair.Value; var name = pair.Key; if (value is string) { sb.AppendFormat("{0}:\"{1}\"", name, value); } else if (value is IDictionary&lt;string, object&gt;) { new DynamicJsonObject((IDictionary&lt;string, object&gt;)value).ToString(sb); } else if (value is ArrayList) { sb.Append(name + ":["); var firstInArray = true; foreach (var arrayValue in (ArrayList)value) { if (!firstInArray) sb.Append(","); firstInArray = false; if (arrayValue is IDictionary&lt;string, object&gt;) new DynamicJsonObject((IDictionary&lt;string, object&gt;)arrayValue).ToString(sb); else if (arrayValue is string) sb.AppendFormat("\"{0}\"", arrayValue); else sb.AppendFormat("{0}", arrayValue); } sb.Append("]"); } else { sb.AppendFormat("{0}:{1}", name, value); } } sb.Append("}"); } public override bool TryGetMember(GetMemberBinder binder, out object result) { if (!_dictionary.TryGetValue(binder.Name, out result)) { // return null to avoid exception. caller can check for null this way... result = null; return true; } result = WrapResultObject(result); return true; } public override bool TryGetIndex(GetIndexBinder binder, object[] indexes, out object result) { if (indexes.Length == 1 &amp;&amp; indexes[0] != null) { if (!_dictionary.TryGetValue(indexes[0].ToString(), out result)) { // return null to avoid exception. caller can check for null this way... result = null; return true; } result = WrapResultObject(result); return true; } return base.TryGetIndex(binder, indexes, out result); } private static object WrapResultObject(object result) { var dictionary = result as IDictionary&lt;string, object&gt;; if (dictionary != null) return new DynamicJsonObject(dictionary); var arrayList = result as ArrayList; if (arrayList != null &amp;&amp; arrayList.Count &gt; 0) { return arrayList[0] is IDictionary&lt;string, object&gt; ? new List&lt;object&gt;(arrayList.Cast&lt;IDictionary&lt;string, object&gt;&gt;().Select(x =&gt; new DynamicJsonObject(x))) : new List&lt;object&gt;(arrayList.Cast&lt;object&gt;()); } return result; } } #endregion } </code></pre> <p>You can use it like this:</p> <pre><code>string json = ...; var serializer = new JavaScriptSerializer(); serializer.RegisterConverters(new[] { new DynamicJsonConverter() }); dynamic obj = serializer.Deserialize(json, typeof(object)); </code></pre> <p>So, given a JSON string:</p> <pre><code>{ "Items":[ { "Name":"Apple", "Price":12.3 }, { "Name":"Grape", "Price":3.21 } ], "Date":"21/11/2010" } </code></pre> <p>The following code will work at runtime:</p> <pre><code>dynamic data = serializer.Deserialize(json, typeof(object)); data.Date; // "21/11/2010" data.Items.Count; // 2 data.Items[0].Name; // "Apple" data.Items[0].Price; // 12.3 (as a decimal) data.Items[1].Name; // "Grape" data.Items[1].Price; // 3.21 (as a decimal) </code></pre>
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    1. USDrew Noakes
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    1. COThanks Drew, your TryGetMember sorted my issue around recursing into nested collections, but could you perhaps let us know what it is that makes it work. Is it in the fact that array lists are cast into IDictionary and then projected as DynamicJsonObjects, rather than being projected as arrayList members? Hope this isn't a too dumb question. Thanks for the answer :)
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      1. USMark Dickinson
    2. CO@Mark, it's been a while since I looked at this but from memory what you're describing sounds right.
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    3. COI get an error in dynamic obj = serializer.Deserialize(json, typeof(object)); saying that no overload for method with 2 arguments..wrong dll or what?
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      1. USStewie Griffin
 

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