yes.blog/Yes.Infrastructure/ViewEngine/Ensure.cs

namespace Yes.Infrastructure.ViewEngine
{
    internal static class Ensure
    {
        public static void NotNull<T>(T argument, string argumentName) where T : class
        {
            if (argument == null)
                throw new ArgumentNullException(argumentName);
        }

        public static void NotNullOrEmpty(string argument, string argumentName)
        {
            if (string.IsNullOrEmpty(argument))
                throw new ArgumentNullException(argument, argumentName);
        }

        public static void Positive(int number, string argumentName)
        {
            if (number <= 0)
                throw new ArgumentOutOfRangeException(argumentName, argumentName + " should be positive.");
        }

        public static void Positive(long number, string argumentName)
        {
            if (number <= 0)
                throw new ArgumentOutOfRangeException(argumentName, argumentName + " should be positive.");
        }

        public static void Nonnegative(long number, string argumentName)
        {
            if (number < 0)
                throw new ArgumentOutOfRangeException(argumentName, argumentName + " should be non negative.");
        }

        public static void Nonnegative(int number, string argumentName)
        {
            if (number < 0)
                throw new ArgumentOutOfRangeException(argumentName, argumentName + " should be non negative.");
        }

        public static void NotEmptyGuid(Guid guid, string argumentName)
        {
            if (Guid.Empty == guid)
                throw new ArgumentException(argumentName, argumentName + " should be non-empty GUID.");
        }

        public static void Equal(int expected, int actual, string argumentName)
        {
            if (expected != actual)
                throw new ArgumentException(string.Format("{0} expected value: {1}, actual value: {2}", argumentName,
                    expected, actual));
        }

        public static void Equal(string expected, string actual, string argumentName)
        {
            if (!expected.Equals(actual))
                throw new ArgumentException(string.Format("{0} expected value: {1}, actual value: {2}", argumentName,
                    expected, actual));
        }

        public static void Equal(long expected, long actual, string argumentName)
        {
            if (expected != actual)
                throw new ArgumentException(string.Format("{0} expected value: {1}, actual value: {2}", argumentName,
                    expected, actual));
        }

        public static void Equal(bool expected, bool actual, string argumentName)
        {
            if (expected != actual)
                throw new ArgumentException(string.Format("{0} expected value: {1}, actual value: {2}", argumentName,
                    expected, actual));
        }
    }
}