How to Efficiently Access Properties of Dynamic Objects in .NET?

Use dictionaries to efficiently access the properties of dynamic objects

Background:

When creating dynamic objects using the dynamic keyword in .NET 4, getting a dictionary of properties and their values ​​can be a challenge. Traditional reflection methods may not be sufficient.

Attributes of dynamic objects:

Dynamic objects in .NET, such as ExpandoObject, create properties dynamically at runtime. The compiler does not know these properties in advance, making it difficult to access them using standard techniques.

Solution for ExpandoObject:

Luckily for ExpandoObject there is a simple solution. Since ExpandoObject implements the IDictionary<string, object> interface, we can directly cast the dynamic object to this type and access its properties in the form of a dictionary:

<code class="language-C#">IDictionary<string, object> propertyValues = (IDictionary<string, object>)s;</code>

Universal dynamic objects:

However, this approach does not work with generic dynamic objects that do not inherit from IDictionary<string, object>. In this case, we need to leverage the Dynamic Language Runtime (DLR). This involves using the IDynamicMetaObjectProvider interface:

<code class="language-C#">var metaObject = (IDynamicMetaObjectProvider)s;
var properties = metaObject.GetMetaObject(Expression.Constant(s)).GetDynamicMemberNames();</code>

This method involves more complex DLR operations and should be considered for non-ExpandoObject dynamic objects.

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