How can I create, sort, and filter dynamic properties in C# at runtime?

Creating Dynamic Properties in C

Dynamic Property Addition and Modification

To create dynamic properties in a class at runtime, you can utilize a dictionary to store property names and values. Consider the following code:

Dictionary<string, object> properties = new Dictionary<string, object>();

This dictionary can be used to define dynamic properties for the class. For example, to add a dynamic property named "test" with a value of 100, you would write:

properties["test"] = 100;

Sorting and Filtering Dynamic Properties

Once you have created dynamic properties, you can also add sorting and filtering capabilities to your objects. Here's an example of using LINQ for filtering:

var filtered = from obj in objects
             where (int)obj["test"] >= 150
             select obj;

And here's an example of using a custom comparer for sorting:

Comparer<int> c = new Comparer<int>("test");
objects.Sort(c);

Example Implementation

The following complete code sample demonstrates the creation, modification, sorting, and filtering of dynamic properties in C#:

using System;
using System.Collections.Generic;
using System.Linq;

namespace ConsoleApplication1
{
    class ObjectWithProperties
    {
        Dictionary<string, object> properties = new Dictionary<string, object>();

        public object this[string name]
        {
            get
            {
                if (properties.ContainsKey(name))
                {
                    return properties[name];
                }
                return null;
            }
            set
            {
                properties[name] = value;
            }
        }
    }

    class Comparer : IComparer where T : IComparable
    {
        string m_attributeName;

        public Comparer(string attributeName)
        {
            m_attributeName = attributeName;
        }

        public int Compare(ObjectWithProperties x, ObjectWithProperties y)
        {
            return ((T)x[m_attributeName]).CompareTo((T)y[m_attributeName]);
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            // create some objects and fill a list
            var obj1 = new ObjectWithProperties();
            obj1["test"] = 100;
            var obj2 = new ObjectWithProperties();
            obj2["test"] = 200;
            var obj3 = new ObjectWithProperties();
            obj3["test"] = 150;
            var objects = new List(new ObjectWithProperties[] { obj1, obj2, obj3 });

            // filtering:
            Console.WriteLine("Filtering:");
            var filtered = from obj in objects
                           where (int)obj["test"] >= 150
                           select obj;
            foreach (var obj in filtered)
            {
                Console.WriteLine(obj["test"]);
            }

            // sorting:
            Console.WriteLine("Sorting:");
            Comparer c = new Comparer("test");
            objects.Sort(c);
            foreach (var obj in objects)
            {
                Console.WriteLine(obj["test"]);
            }
        }
    }
}

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