create umbraco macro with custom properties

gistfile1.cs

// Using old namespace to create Macro, since Umbraco.Core.Models.Macro is still an internal class in Umbraco V7.1.8
var macro = new Macro.Macro { Alias = alias, Name = name, ScriptingFile = scriptingFile, UseInEditor = useInEditor, RenderContent = renderContent };
macro.Save();

var newMacro = Services.MacroService.GetByAlias(alias);
foreach (var macroProperty in macroProperties)
{
  newMacro.Properties.Add(macroProperty);
}
Services.MacroService.Save(newMacro);