using System;

using System.Collections.Generic;

using System.Dynamic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        dynamic t = new NamedTuple(new[] { "one", "two", "three" });

        t.Make(new object[] { 3, 2, 1 });

        Console.WriteLine(t.one);

    }

}

​

    /// <summary>

    /// A .Net equivalent to Python's namedtuple (http://docs.python.org/dev/library/collections.html#collections.namedtuple)

    /// </summary>

    /// <example>

    /// dynamic t = new NamedTuple(new[] { "one", "two", "three" });

    /// t.Make(new object[] { 3, 2, 1 });

    /// 

    /// Assert.AreEqual(3, t.one);

    /// Assert.AreEqual(2, t.two);

    /// Assert.AreEqual(1, t.three);

    /// </example>

    public class NamedTuple : DynamicObject

    {

        private readonly IDictionary<string, object> _contained = new Dictionary<string, object>();

​

        /// <summary>

        /// Initializes a new instance of the <see cref="NamedTuple"/> class.

        /// </summary>

        /// <param name="propertiesAndValues">The properties and values.</param>

        public NamedTuple(IDictionary<string, object> propertiesAndValues)

        {

            _contained = propertiesAndValues;

        }

​

        /// <summary>

        /// Initializes a new instance of the <see cref="NamedTuple"/> class.

        /// </summary>

        /// <param name="propertyNames">The property names.</param>

        public NamedTuple(IEnumerable<string> propertyNames)

        {

            foreach (var property in propertyNames)

            {

                _contained.Add(property, null);

            }

        }

​

        /// <summary>

        /// Makes the tuple by populating the fields with the given contents

        /// in the order they are specified and the order the fields were added

        /// to this instance

        /// </summary>

        /// <param name="contents">The contents with which to populate the fields</param>

        public void Make(IEnumerable<object> contents)

        {

            for (int i = 0; i < contents.Count(); i++)

            {

                _contained[_contained.Keys.ElementAt(i)] = contents.ElementAt(i);

            }

        }

​

        /// <summary>

        /// Gets the fields aka Property names that can be used with this instance

        /// </summary>

        public ICollection<string> Fields

        {

            get

            {

                return _contained.Keys;

            }

        }

​

        /// <summary>

        /// Replaces the specified field with the given value

        /// </summary>

        /// <param name="field">The field of which to replace the value</param>

        /// <param name="value">The new value.</param>

        /// <returns>A new instance of NamedTuple with the <paramref name="field"/>'s value replaced with <paramref name="value"/></returns>

        /// <exception cref="System.ArgumentException">Field not found in tuple;field</exception>

        public NamedTuple Replace(string field, object value)

        {

            if (!_contained.ContainsKey(field))

            {

                throw new ArgumentException("Field not found in tuple", "field");

            }

​

            var newDict = new Dictionary<string, object>(_contained);

            newDict[field] = value;

​

            return new NamedTuple(newDict);

        }

​

        /// <summary>

        /// Converts an <seealso cref="ExpandoObject"/> to a NamedTuple

        /// </summary>

        /// <param name="eo">The expando object.</param>

        /// <returns></returns>

        public static implicit operator NamedTuple(ExpandoObject eo)

        {

            return new NamedTuple((IDictionary<string, object>)eo);

        }

​

        /// <summary>

        /// Converts this instance to a <seealso cref="Dictionary{string,object}"/>

        /// </summary>

        /// <param name="me">The NamedTuple instance to convert.</param>

        /// <returns></returns>

        public static implicit operator Dictionary<string, object>(NamedTuple me)

        {

            return (Dictionary<string, object>)me._contained;

        }

​

        /// <summary>

        /// Provides the implementation for operations that get member values. Classes derived from the <see cref="T:System.Dynamic.DynamicObject" /> class can override this method to specify dynamic behavior for operations such as getting a value for a property.

        /// </summary>

        /// <param name="binder">Provides information about the object that called the dynamic operation. The binder.Name property provides the name of the member on which the dynamic operation is performed. For example, for the Console.WriteLine(sampleObject.SampleProperty) statement, where sampleObject is an instance of the class derived from the <see cref="T:System.Dynamic.DynamicObject" /> class, binder.Name returns "SampleProperty". The binder.IgnoreCase property specifies whether the member name is case-sensitive.</param>

        /// <param name="result">The result of the get operation. For example, if the method is called for a property, you can assign the property value to <paramref name="result" />.</param>

        /// <returns>

        /// true if the operation is successful; otherwise, false. If this method returns false, the run-time binder of the language determines the behavior. (In most cases, a run-time exception is thrown.)

        /// </returns>

        public override bool TryGetMember(GetMemberBinder binder, out object result)

        {

            var contAsDict = (IDictionary<string, object>)_contained;

            return contAsDict.TryGetValue(binder.Name, out result);

        }

​

        /// <summary>

        /// Provides the implementation for operations that set member values. Classes derived from the <see cref="T:System.Dynamic.DynamicObject" /> class can override this method to specify dynamic behavior for operations such as setting a value for a property.

        /// </summary>

        /// <param name="binder">Provides information about the object that called the dynamic operation. The binder.Name property provides the name of the member to which the value is being assigned. For example, for the statement sampleObject.SampleProperty = "Test", where sampleObject is an instance of the class derived from the <see cref="T:System.Dynamic.DynamicObject" /> class, binder.Name returns "SampleProperty". The binder.IgnoreCase property specifies whether the member name is case-sensitive.</param>

        /// <param name="value">The value to set to the member. For example, for sampleObject.SampleProperty = "Test", where sampleObject is an instance of the class derived from the <see cref="T:System.Dynamic.DynamicObject" /> class, the <paramref name="value" /> is "Test".</param>

        /// <returns>

        /// true if the operation is successful; otherwise, false. If this method returns false, the run-time binder of the language determines the behavior. (In most cases, a language-specific run-time exception is thrown.)

        /// </returns>

        public override bool TrySetMember(SetMemberBinder binder, object value)

        {

            var contAsDict = (IDictionary<string, object>)_contained;

            try

            {

                contAsDict[binder.Name] = value;

                return true;

            }

            catch

            {

                return false;

            }

        }

    }