Get property name from lambda expression

gistfile1.cs

        using System.Linq.Expressions;

        /// <summary>
        /// Returns the name of the specified property of the specified type.
        /// </summary>
        /// <typeparam name="T">The type the property is a member of.</typeparam>
        /// <param name="property">The property expression.</param>
        /// <returns>The property name.</returns>
        public static string GetPropertyName<T>(Expression<Func<T, object>> property)
        {
            var lambda = (LambdaExpression)property;
            MemberExpression memberExpression;

            if (lambda.Body is UnaryExpression)
            {
                UnaryExpression unaryExpression = (UnaryExpression)(lambda.Body);
                memberExpression = (MemberExpression)(unaryExpression.Operand);
            }
            else
            {
                memberExpression = (MemberExpression)(lambda.Body);
            }

            var propertyInfo = memberExpression.Member as PropertyInfo;

            if (propertyInfo == null)
            {
                throw new ArgumentException("Does not expess a property.", nameof(property));
            }

            return propertyInfo.Name;
        }

        // C# 9 version (works for other member types as well)

        public static string GetMemberName<T>(this Expression<T> expression) =>
            expression.Body switch
            {
                MemberExpression m => m.Member.Name,
                UnaryExpression { Operand: MemberExpression m } => m.Member.Name,
                _ => throw new NotImplementedException(expression.GetType().ToString())
            };

Awesome, thanks a lot!