File size: 2,763 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Dynamic;
using System.Linq.Expressions;
namespace System.Management.Automation.ComInterop
{
//
// ComFallbackMetaObject just delegates everything to the binder.
//
// Note that before performing FallBack on a ComObject we need to unwrap it so that
// binder would act upon the actual object (typically Rcw)
//
// Also: we don't need to implement these for any operations other than those
// supported by ComBinder
internal class ComFallbackMetaObject : DynamicMetaObject
{
internal ComFallbackMetaObject(Expression expression, BindingRestrictions restrictions, object arg)
: base(expression, restrictions, arg)
{
}
public override DynamicMetaObject BindGetIndex(GetIndexBinder binder, DynamicMetaObject[] indexes)
{
Requires.NotNull(binder);
return binder.FallbackGetIndex(UnwrapSelf(), indexes);
}
public override DynamicMetaObject BindSetIndex(SetIndexBinder binder, DynamicMetaObject[] indexes, DynamicMetaObject value)
{
Requires.NotNull(binder);
return binder.FallbackSetIndex(UnwrapSelf(), indexes, value);
}
public override DynamicMetaObject BindGetMember(GetMemberBinder binder)
{
Requires.NotNull(binder);
return binder.FallbackGetMember(UnwrapSelf());
}
public override DynamicMetaObject BindInvokeMember(InvokeMemberBinder binder, DynamicMetaObject[] args)
{
Requires.NotNull(binder);
return binder.FallbackInvokeMember(UnwrapSelf(), args);
}
public override DynamicMetaObject BindSetMember(SetMemberBinder binder, DynamicMetaObject value)
{
Requires.NotNull(binder);
return binder.FallbackSetMember(UnwrapSelf(), value);
}
protected virtual ComUnwrappedMetaObject UnwrapSelf()
{
return new ComUnwrappedMetaObject(
ComObject.RcwFromComObject(Expression),
Restrictions.Merge(ComBinderHelpers.GetTypeRestrictionForDynamicMetaObject(this)),
((ComObject)Value).RuntimeCallableWrapper
);
}
}
// This type exists as a signal type, so ComBinder knows not to try to bind
// again when we're trying to fall back
internal sealed class ComUnwrappedMetaObject : DynamicMetaObject
{
internal ComUnwrappedMetaObject(Expression expression, BindingRestrictions restrictions, object value)
: base(expression, restrictions, value)
{
}
}
}
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