/// <summary>
/// Performs the binding of the dynamic get index operation if the target dynamic object cannot bind.
/// </summary>
/// <param name="target">The target of the dynamic get index operation.</param>
/// <param name="indexes">The arguments of the dynamic get index operation.</param>
/// <param name="errorSuggestion">The binding result to use if binding fails, or null.</param>
/// <returns>The <see cref="DynamicMetaObject"/> representing the result of the binding.</returns>
public override DynamicMetaObject FallbackGetIndex(DynamicMetaObject target, DynamicMetaObject[] indexes, DynamicMetaObject errorSuggestion)
{
#if ENABLECOMBINDER
DynamicMetaObject com;
if (!BinderHelper.IsWindowsRuntimeObject(target) && ComBinder.TryBindGetIndex(this, target, indexes, out com))
{
return(com);
}
#endif
return(BinderHelper.Bind(this, _binder, BinderHelper.Cons(target, indexes), _argumentInfo, errorSuggestion));
}
public override DynamicMetaObject FallbackGetIndex(DynamicMetaObject target, DynamicMetaObject[] indexes, DynamicMetaObject errorSuggestion)
{
if (ComBinder.TryBindGetIndex(this, target, indexes, out DynamicMetaObject result))
{
return(result);
}
if (!target.HasValue || indexes.Any(x => !x.HasValue))
{
return(Defer(target, indexes));
}
var expression = RuntimeHelpers.EnsureObjectResult(RuntimeHelpers.GetIndexingExpression(target, indexes));
var restrictions = RuntimeHelpers.GetTargetArgsRestrictions(target, indexes, false);
return(new DynamicMetaObject(expression, restrictions));
}
public override DynamicMetaObject FallbackGetIndex(
DynamicMetaObject target, DynamicMetaObject[] indexes,
DynamicMetaObject errorSuggestion)
{
#if !SILVERLIGHT
// First try COM binding.
DynamicMetaObject result;
if (ComBinder.TryBindGetIndex(this, target, indexes, out result))
{
return(result);
}
#endif
// Defer if any object has no value so that we evaulate their
// Expressions and nest a CallSite for the InvokeMember.
if (!target.HasValue || indexes.Any((a) => !a.HasValue))
{
var deferArgs = new DynamicMetaObject[indexes.Length + 1];
for (int i = 0; i < indexes.Length; i++)
{
deferArgs[i + 1] = indexes[i];
}
deferArgs[0] = target;
return(Defer(deferArgs));
}
var restrictions = RuntimeHelpers.GetTargetArgsRestrictions(
target, indexes, false);
if (target.HasValue && target.Value == null)
{
return(errorSuggestion ?? RuntimeHelpers.CreateThrow(target,
indexes,
restrictions,
typeof(NullReferenceException),
"Object reference not set to an instance of an object."));
}
var indexingExpr = RuntimeHelpers.EnsureObjectResult(
RuntimeHelpers.GetIndexingExpression(target,
indexes));
return(new DynamicMetaObject(indexingExpr, restrictions));
}
public override DynamicMetaObject FallbackGetIndex(DynamicMetaObject target, DynamicMetaObject[] args, DynamicMetaObject?errorSuggestion)
{
// First try COM binding.
if (ComBinder.TryBindGetIndex(this, target, args, out var result))
{
return(result);
}
// Defer if any object has no value so that we evaulate their Expressions and nest a
// CallSite for the InvokeMember.
if (!target.HasValue || Array.Exists(args, a => !a.HasValue))
{
var deferArgs = new DynamicMetaObject[args.Length + 1];
deferArgs[0] = target;
args.CopyTo(deferArgs.AsSpan(1));
return(Defer(deferArgs));
}
// Give good error for Cons.
if (target.LimitType == typeof(Cons))
{
if (args.Length != 1)
{
return(errorSuggestion ?? RuntimeHelpers.CreateThrow(target, args, BindingRestrictions.Empty,
typeof(InvalidOperationException),
$"Indexing list takes single index. Got {args.Length}"));
}
}
// Find our own binding.
// Conversions created in GetIndexExpression must be consistent with restrictions made in GetTargetArgsRestrictions.
var indexingExpr = RuntimeHelpers.EnsureObjectResult(RuntimeHelpers.GetIndexingExpression(target, args));
var restrictions = RuntimeHelpers.GetTargetArgsRestrictions(target, args, false);
return(new DynamicMetaObject(indexingExpr, restrictions));
}
