Adding unknown (at design time) properties to an ExpandoObject

by

I wondered how it might be possible to add members to a class “on the fly” and came up with this sample:

using System;
using System.Collections.Generic;
using System.Dynamic;

class Program
{
    static void Main()
    {
        dynamic expando = new ExpandoObject();
        var p = expando as IDictionary<String, object>;

        p["A"] = "New val 1";
        p["B"] = "New val 2";

        Console.WriteLine(expando.A);
        Console.WriteLine(expando.B);
    }
}

The point of this code snippet is that the members A and B are defined as string literals (hard coded/stringified) in and added via ExpandoObject’s IDictionary interface. We test for the keys’ existence and values (and prove the concept) by accessing them directly and outputting to console.

More Related Contents:

  1. Dynamically adding properties to an ExpandoObject
  2. index out of range exception occurred [duplicate]
  3. how to add new method to TextBox Class [closed]
  4. Extension method and dynamic object
  5. What is the ‘dynamic’ type in C# 4.0 used for?
  6. Interop type cannot be embedded
  7. When to dispose CancellationTokenSource?
  8. C# Create New T()
  9. Does Parallel.ForEach limit the number of active threads?
  10. List thread safety
  11. Why Interface Layer/Abstract classes required in our project? [closed]
  12. C# 4.0, optional parameters and params do not work together
  13. using ITextSharp to extract and update links in an existing PDF
  14. How to flatten an ExpandoObject returned via JsonResult in asp.net mvc?
  15. Overloaded method-group argument confuses overload resolution?
  16. How to get text between nested parentheses?
  17. C# 4.0: Can I use a TimeSpan as an optional parameter with a default value?
  18. Why is list when passed without ref to a function acting like passed with ref?
  19. Limit the number of parallel threads in C#
  20. Why is AddRange faster than using a foreach loop?
  21. How can I simulate a mouse click at a certain position on the screen?
  22. Serialize an object to XElement and Deserialize it in memory
  23. Fastest way to Remove Duplicate Value from a list by lambda
  24. Why does C# (4.0) not allow co- and contravariance in generic class types?
  25. Question about C# covariance
  26. Calculate distance of two geo points in km c#
  27. C# – Issues with boxing / unboxing / typecasting ints. I don’t understand
  28. C#-How to use empty List as optional parameter
  29. USB Device Connected
  30. Visual Studio 2010: How to enforce build order of projects in a solution?

Leave a Comment