How to make that the LanguageBinder take precedence over the DynamicBinder
- by rudimenter
Hi
I Have a class which implement IDynamicMetaObjectProvider
I implement the BindGetMember Method from DynamicMetaObject.
Now when i Generate a dynamic Object and Access a property every call gets implicit passed through the BindGetMember Method.
I want that at first the language Binder get his chance before my code comes in.
It is somehow doable with "binder.FallbackGetMember" but i am not sure how the expression has to look like.
I call here
dynamic com=CommandFactory.GetCommand();
com.testprop; //expected: "test"; but "test2" comes back
public class Command : System.Dynamic.IDynamicMetaObjectProvider
{
public string testprop
{
get
{
return "test";
}
}
public object GetValue(string name)
{
return "test2";
}
System.Dynamic.DynamicMetaObject System.Dynamic.IDynamicMetaObjectProvider.GetMetaObject(System.Linq.Expressions.Expression parameter)
{
return new MetaCommand(parameter, this);
}
private class MetaCommand : System.Dynamic.DynamicMetaObject
{
public MetaCommand(Expression expression, Command value)
: base(expression, System.Dynamic.BindingRestrictions.Empty, value)
{ }
public override System.Dynamic.DynamicMetaObject BindGetMember(System.Dynamic.GetMemberBinder binder)
{
var self = this.Expression;
var bag = (Command)base.Value;
Expression target;
target =
Expression.Call(
Expression.Convert(self, typeof(Command)),
typeof(Command).GetMethod("GetValue"),
Expression.Constant(binder.Name)
);
var restrictions = BindingRestrictions
.GetInstanceRestriction(self, bag);
return new DynamicMetaObject(target, restrictions);
}
#endregion
}
}
