dynamic and ExpandoObject

ExpandoObject-example.cs

dynamic x = new ExpandoObject();
x.NewProp = string.Empty;
Alternatively:

var x = new ExpandoObject() as IDictionary<string, Object>;
x.Add("NewProp", string.Empty);

//=============
IDictionary<string, object> expando = new ExpandoObject();
expando["foo"] = "bar";

dynamic d = expando;
Console.WriteLine(d.foo); // bar

//Example use case, convert XML payload. loop over the elements, e.g.

var doc = XDocument.Load(file);
IDictionary<string, object> expando = new ExpandoObject();
foreach (var element in doc.Root.Elements())
{
    expando[element.Name.LocalName] = (string) element;
}


//================================
//helper class which converts an Object and returns an Expando with all public properties of the given object;
//useful when you want to augment an object with more props
public static class dynamicHelper
        {
            public static ExpandoObject convertToExpando(object obj)
            {
                //Get Properties Using Reflections
                BindingFlags flags = BindingFlags.Public | BindingFlags.Instance;
                PropertyInfo[] properties = obj.GetType().GetProperties(flags);

                //Add Them to a new Expando
                ExpandoObject expando = new ExpandoObject();
                foreach (PropertyInfo property in properties)
                {
                    AddProperty(expando, property.Name, property.GetValue(obj));
                }

                return expando;
            }

            public static void AddProperty(ExpandoObject expando, string propertyName, object propertyValue)
            {
                //Take use of the IDictionary implementation
                var expandoDict = expando as IDictionary;
                if (expandoDict.ContainsKey(propertyName))
                    expandoDict[propertyName] = propertyValue;
                else
                    expandoDict.Add(propertyName, propertyValue);
            }
        }

//Usage:
//Create Dynamic Object
dynamic expandoObj= dynamicHelper.convertToExpando(myObject);

//Add Custom Properties
dynamicHelper.AddProperty(expandoObj, "dynamicKey", "Some Value");