Best way to check for null parameters (Guard Clauses)

Question

For example, you usually don\'t want parameters in a constructor to be null, so it\'s very normal to see some thing like

if (someArg == null)
{
    throw new Arg         


        

Answer 1

The simplest approach I've found is inspired by Dapper's use of anonymous types. I've written a Guard class that uses anonymous types to get name of properties. The guard itself is the following

    public class Guard
    {
        public static void ThrowIfNull(object param) 
        {
            var props = param.GetType().GetProperties();
            foreach (var prop in props) 
            {
                var name = prop.Name;
                var val = prop.GetValue(param, null);

                _ = val ?? throw new ArgumentNullException(name);
            }
        }
    }

The use is then

...
        public void Method(string someValue, string otherValue)
        {
            Guard.ThrowIfNull(new { someValue, otherValue }); 
        }
...

When the ArgumentNullException is thrown and the correctly named property will be displayed.