public static Action <Foo> CompileUntyped(TransformationBase transformation)
{
var transformType = transformation.GetType();
var genericType = transformType.GetGenericArguments().First();
var fooParam = Expression.Parameter(typeof(Foo), "f");
var valueGetter = typeof(Foo).GetProperty("Value").GetGetMethod();
var valueSetter = typeof(Foo).GetProperty("Value").GetSetMethod();
var transformFuncMember = transformType.GetProperty("Transform").GetGetMethod();
//Equivalent to f => f.Value = transformation.Transform((T)f.Value)
//Where T is the generic type parameter of the Transformation, and f is of type Foo
var expression = Expression.Lambda <Action <Foo> >(
Expression.Call(
fooParam,
valueSetter,
Expression.Invoke(
Expression.Property(
Expression.Constant(transformation, transformType),
transformFuncMember
),
Expression.Convert(
Expression.Property(fooParam, valueGetter),
genericType
)
)
), fooParam
);
return(expression.Compile());
}
public static Action <Foo> CompileReflection(TransformationBase transformation)
{
var f = transformation
.GetType()
.GetProperty("Transform")
.GetGetMethod()
.Invoke(transformation, null) as Delegate;
return(foo => foo.Value = f.DynamicInvoke(foo.Value));
}