public override MetaObject SetMember(SetMemberAction action, MetaObject[] args)
{
if (ImplementsActions(StandardActionKinds.SetMember))
{
return(CallMethodBinary(action, args[1], "SetMember"));
}
return(base.SetMember(action, args));
}
public override MetaObject SetMember(SetMemberAction action, MetaObject[] args)
{
return new MetaObject(
Expression.Call(
Expression.Convert(Expression, LimitType),
typeof(Duck).GetMethod("SetMember", new Type[] { typeof(SetMemberAction), typeof(object) }),
Expression.Convert(Expression.Constant(action), typeof(SetMemberAction)),
args[1].Expression
),
Restrictions.TypeRestriction(Expression, LimitType)
);
}
/// <summary>
/// Helper method for generating a MetaObject which calls a specific method declared on
/// Dynamic w/ one additional parameter.
/// </summary>
private MetaObject CallMethodBinary(SetMemberAction action, MetaObject arg, string methodName)
{
return(new MetaObject(
Expression.Call(
GetLimitedSelf(),
typeof(DynamicObject).GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Instance),
Expression.Constant(action),
arg.Expression
),
GetRestrictions()
));
}
/// <summary>
/// Creates ActionExpression representing a SetMember action.
/// </summary>
/// <param name="name">The qualifier.</param>
/// <param name="result">Type of the result desired (The ActionExpression is strongly typed)</param>
/// <param name="arguments">Array of arguments for the action expression</param>
/// <returns>New instance of the ActionExpression</returns>
public static ActionExpression SetMember(SymbolId name, Type result, params Expression[] arguments)
{
return(ActionExpression(SetMemberAction.Make(name), arguments, result));
}
/// <summary>
/// Helper method for generating a MetaObject which calls a specific method declared on
/// Dynamic w/ one additional parameter.
/// </summary>
private MetaObject CallMethodBinary(SetMemberAction action, MetaObject arg, string methodName)
{
return new MetaObject(
Expression.Call(
GetLimitedSelf(),
typeof(DynamicObject).GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Instance),
Expression.Constant(action),
arg.Expression
),
GetRestrictions()
);
}
public override MetaObject SetMember(SetMemberAction action, MetaObject[] args)
{
if (ImplementsActions(StandardActionKinds.SetMember)) {
return CallMethodBinary(action, args[1], "SetMember");
}
return base.SetMember(action, args);
}
/// <summary>
/// When overridden in a derived class provides the non-Meta implementation of setting a member.
///
/// When not overridden the call site requesting the action determines the behavior.
/// </summary>
protected virtual void SetMember(SetMemberAction action, object value)
{
throw new NotSupportedException();
}
protected override void SetMember(SetMemberAction action, object value)
{
if (_parameters == null) {
_parameters = new Dictionary<string, object>();
}
_parameters[action.Name] = value;
}
protected override void SetMember(SetMemberAction action, object value)
{
string name = action.Name;
if (String.CompareOrdinal(name, "Value") == 0) {
_element.Value = (value != null) ? value.ToString() : String.Empty;
}
base.SetMember(action, value);
}
/// <summary>
/// When overridden in a derived class provides the non-Meta implementation of setting a member.
///
/// When not overridden the call site requesting the action determines the behavior.
/// </summary>
protected virtual void SetMember(SetMemberAction action, object value)
{
throw new NotSupportedException();
}
