public CustomAttributeValueProjection(AttributeTargets targets, CustomAttributeValueTreatment treatment)
{
Targets = targets;
Treatment = treatment;
}
private BlobHandle GetProjectedValue(CustomAttributeValueTreatment treatment)
{
BlobHandle.VirtualIndex virtualIndex;
bool isVersionOrDeprecated;
switch (treatment)
{
case CustomAttributeValueTreatment.AttributeUsageVersionAttribute:
case CustomAttributeValueTreatment.AttributeUsageDeprecatedAttribute:
virtualIndex = BlobHandle.VirtualIndex.AttributeUsage_AllowMultiple;
isVersionOrDeprecated = true;
break;
case CustomAttributeValueTreatment.AttributeUsageAllowMultiple:
virtualIndex = BlobHandle.VirtualIndex.AttributeUsage_AllowMultiple;
isVersionOrDeprecated = false;
break;
case CustomAttributeValueTreatment.AttributeUsageAllowSingle:
virtualIndex = BlobHandle.VirtualIndex.AttributeUsage_AllowSingle;
isVersionOrDeprecated = false;
break;
default:
Debug.Assert(false);
return default(BlobHandle);
}
// Raw blob format:
// 01 00 - Fixed prolog for CA's
// xx xx xx xx - The Windows.Foundation.Metadata.AttributeTarget value
// 00 00 - Indicates 0 name/value pairs following.
var rawBlob = _reader.CustomAttributeTable.GetValue(Handle);
var rawBlobReader = _reader.GetBlobReader(rawBlob);
if (rawBlobReader.Length != 8)
{
return rawBlob;
}
if (rawBlobReader.ReadInt16() != 1)
{
return rawBlob;
}
AttributeTargets projectedValue = ProjectAttributeTargetValue(rawBlobReader.ReadUInt32());
if (isVersionOrDeprecated)
{
projectedValue |= AttributeTargets.Constructor | AttributeTargets.Property;
}
return BlobHandle.FromVirtualIndex(virtualIndex, (ushort)projectedValue);
}
public CustomAttributeValueProjection(AttributeTargets targets, CustomAttributeValueTreatment treatment)
{
Targets = targets;
Treatment = treatment;
}
