private DynamicMetaObject CallMethodReturnLast(string methodName, DynamicMetaObjectBinder binder, Expression[] args, Fallback fallback)
{
DynamicMetaObject obj2 = fallback(null);
ParameterExpression left = Expression.Parameter(typeof(object), null);
Expression[] arguments = args.AddFirst<Expression>(Constant(binder));
arguments[args.Length] = Expression.Assign(left, arguments[args.Length]);
DynamicMetaObject errorSuggestion = new DynamicMetaObject(Expression.Block(new ParameterExpression[] { left }, new Expression[] { Expression.Condition(Expression.Call(this.GetLimitedSelf(), typeof(DynamicObject).GetMethod(methodName), arguments), left, obj2.Expression, typeof(object)) }), this.GetRestrictions().Merge(obj2.Restrictions));
return fallback(errorSuggestion);
}
/// <summary>
/// Helper method for generating a MetaObject which calls a
/// specific method on Dynamic, but uses one of the arguments for
/// the result.
/// </summary>
private DynamicMetaObject CallMethodNoResult(string methodName, DynamicMetaObjectBinder binder, Expression[] args, Fallback fallback) {
//
// First, call fallback to do default binding
// This produces either an error or a call to a .NET member
//
DynamicMetaObject fallbackResult = fallback(null);
//
// Build a new expression like:
// TryDeleteMember(payload) ? null : fallbackResult
//
var callDynamic = new DynamicMetaObject(
Expression.Condition(
Expression.Call(
GetLimitedSelf(),
typeof(DynamicObject).GetMethod(methodName),
args.AddFirst(Constant(binder))
),
Expression.Constant(null),
DynamicMetaObjectBinder.Convert(fallbackResult.Expression, typeof(object))
),
GetRestrictions().Merge(fallbackResult.Restrictions)
);
//
// Now, call fallback again using our new MO as the error
// When we do this, one of two things can happen:
// 1. Binding will succeed, and it will ignore our call to
// the dynamic method, OR
// 2. Binding will fail, and it will use the MO we created
// above.
//
return fallback(callDynamic);
}
private DynamicMetaObject CallMethodNoResult(string methodName, DynamicMetaObjectBinder binder, Expression[] args, Fallback fallback)
{
DynamicMetaObject obj2 = fallback(null);
DynamicMetaObject errorSuggestion = new DynamicMetaObject(Expression.Condition(Expression.Call(this.GetLimitedSelf(), typeof(DynamicObject).GetMethod(methodName), args.AddFirst<Expression>(Constant(binder))), Expression.Empty(), obj2.Expression, typeof(void)), this.GetRestrictions().Merge(obj2.Restrictions));
return fallback(errorSuggestion);
}
/// <summary>
/// Helper method for generating a MetaObject which calls a
/// specific method on Dynamic, but uses one of the arguments for
/// the result.
/// </summary>
private DynamicMetaObject CallMethodReturnLast(string methodName, DynamicMetaObjectBinder binder, Expression[] args, Fallback fallback) {
//
// First, call fallback to do default binding
// This produces either an error or a call to a .NET member
//
DynamicMetaObject fallbackResult = fallback(null);
//
// Build a new expression like:
// {
// object result;
// TrySetMember(payload, result = value) ? result : fallbackResult
// }
//
var result = Expression.Parameter(typeof(object), null);
var callArgs = args.AddFirst(Constant(binder));
callArgs[args.Length] = Expression.Assign(result, callArgs[args.Length]);
var callDynamic = new DynamicMetaObject(
Expression.Block(
new[] { result },
Expression.Condition(
Expression.Call(
GetLimitedSelf(),
typeof(DynamicObject).GetMethod(methodName),
callArgs
),
result,
DynamicMetaObjectBinder.Convert(fallbackResult.Expression, typeof(object))
)
),
GetRestrictions().Merge(fallbackResult.Restrictions)
);
//
// Now, call fallback again using our new MO as the error
// When we do this, one of two things can happen:
// 1. Binding will succeed, and it will ignore our call to
// the dynamic method, OR
// 2. Binding will fail, and it will use the MO we created
// above.
//
return fallback(callDynamic);
}
