PropertyNameExtension.cs

## PropertyNameExtension.cs
using System;
using System.Linq.Expressions;

public static class PropertyNameExtensions
{
    /// <summary>
    /// Extension method for exposing the name of properties without resorting to
    /// magic strings.
    /// Use: objectReference.PropertyName( x => x.{property} ) to retrieve the name.
    /// I.e. objectReference.PropertyName( x => x.IsActive ); //will return "IsActive".
    /// </summary>
    /// <returns>
    /// Property name of the property expression provided.
    /// </returns>
    public static string PropertyName<T, TReturn>(this T obj, Expression<Func<T, TReturn>> property) where T : class
    {
        MemberExpression body = (MemberExpression)property.Body;
        if (body == null)
            throw new ArgumentException("The provided expression did not point to a property.");

        return body.Member.Name;
    }
}

## PropertyNameExtensionUnitTests.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Spynical.Test.NUnit;
using NUnit.Framework;
using System.Linq.Expressions;

namespace PySty.Common
{

    public class PropertyNameUnitTests : BaseTestFixture
    {
        [Test]
        public void EnsurePropertyNameCanExtractPropertiesFromObjectInstance()
        {
            var testObject = new SomeTestObject();
            Assert.AreEqual("SomeValue", testObject.PropertyName(x=>x.SomeValue));
            Assert.AreEqual("SomeOtherValue", testObject.PropertyName(x=>x.SomeOtherValue));
            Assert.AreEqual("SomeKey", testObject.PropertyName(x => x.SomeKey));
        }

        [CoverageExclude(CoverageExcludeAttribute.TestStubClass)]
        private class SomeTestObject : SomeBaseObject
        {
            public string SomeValue
            {
                get;
                set;
            }

            public int SomeOtherValue
            {
                get;
                set;
            }
        }

        [CoverageExclude(CoverageExcludeAttribute.TestStubClass)]
        private class SomeBaseObject
        {
            public int SomeKey
            {
                get;
                set;
            }

            public string SomeMethod()
            {
                return string.Empty;
            }
        }
    }
}