ObjectExtensions.cs

using System;
using System.Linq;

namespace Common.Extensions
{
    public static class ObjectExtensions
    {
        public static TProperty GetOrDefault<TObject, TProperty>(this TObject entity, Func<TObject, TProperty> property)
        {
            return entity.GetOrDefault(property, default(TProperty));
        }

        public static TProperty GetOrDefault<TObject, TProperty>(this TObject entity, Func<TObject, TProperty> property, TProperty @default)
        {
            return entity == null ? @default : property(entity);
        }

        public static TProperty? GetOrNull<TObject, TProperty>(this TObject entity, Func<TObject, TProperty> property)
            where TProperty : struct
        {
            return entity == null ? default(TProperty?) : property(entity);
        }

        public static T? NullIfDefault<T>(this T val)
            where T : struct
        {
            return val.Equals(default(T)) ? default(T?) : val;
        }

        public static T CastTo<T>(this object obj)
        {
            return (T) obj;
        }

        public static T As<T>(this object obj) where T : class
        {
            return obj as T;
        }

        public static bool IsAnyOf<T>(this T obj, params T[] others)
        {
            return others.Contains(obj);
        }

        public static string Format<T>(this T obj, string format, params Func<T, object>[] parameters)
        {
            var formatParams = parameters.Select(x => x(obj));
            return string.Format(format, formatParams.ToArray());
        }
    }
}