Is there such a thing as a chained NULL check?

Question

I have the following ugly code:

if (msg == null || 
    msg.Content == null || 
    msg.Content.AccountMarketMessage == null || 
    msg.Content.AccountMarke         


        

Answer 1

There is no built-in support for this, but you can use an extension method for that:

public static bool IsNull(this T source, string path)
{
     var props = path.Split('.');
     var type = source.GetType();

     var currentObject = type.GetProperty(props[0]).GetValue(source);

     if (currentObject == null) return true;
     foreach (var prop in props.Skip(1))
     {
          currentObject = currentObject.GetType()
                .GetProperty(prop)
                .GetValue(currentObject);

         if (currentObject == null) return true;
     }

     return false;
}

Then call it:

if ( !msg.IsNull("Content.AccountMarketMessage.Account.sObject") )  return;