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Mastering C# for .NET Developers

The ExpandoObject Class

Learn to use the ExpandoObject class to dynamically add properties and methods to an object at runtime.

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A key feature of the DLR resides in the System.Dynamic namespace: the ExpandoObject class. This type lets us create dynamic objects that expand during program execution. For instance, we could add a method or some other member at runtime. The System.Dynamic namespace brings JavaScript-like capabilities to .NET.

Syntax

We instantiate the ExpandoObject class using the new keyword. We declare the variable using the dynamic keyword to utilize its runtime capabilities.

Here is a quick example of how we initialize it: