Question

I have an extension method like this one :

      public static void ImplementsAttribute<TX, TY>(this Expression<Func<TY>> expression) 
     where TX : Coupling.PropertiesMergerAttribute
  {
     var memberExpression = expression.Body as MemberExpression;
     var name = MetaHelper.GetPropertyName(expression);
     var property = memberExpression.Expression.Type.GetProperty(name);
     var attributes = property.GetCustomAttributes(true);
     Assert.IsTrue(attributes.Any(a => a is TX));
  }

I can actually use my code like this :

     Expression<Func<String>> nameProperty = () => new ImprovisedExplosiveXML().Name;
     nameProperty.ImplementsAttribute<Coupling.UnresolvablePropertiesMergerAttribute, String>();

but I would like to not need to specify the second generic parameter type :

     Expression<Func<String>> nameProperty = () => new ImprovisedExplosiveXML().Name;
     nameProperty.ImplementsAttribute<Coupling.UnresolvablePropertiesMergerAttribute>();

Is there a way of doing this in C# 3.5 ?

Answer 1

C# does not support partial generic inference. If the compiler can’t determine all the types you have to supply them all yourself.