//
// Lightweight check to see if a custom attribute's is of a well-known type.
//
// This check performs without instantating the Type object and bloating memory usage. On the flip side,
// it doesn't check on whether the type is defined in a paricular assembly. The desktop CLR typically doesn't
// check this either so this is useful from a compat persective as well.
//
public static bool IsCustomAttributeOfType(this CustomAttributeHandle customAttributeHandle,
MetadataReader reader,
String ns,
String name)
{
String[] namespaceParts = ns.Split('.');
Handle typeHandle = customAttributeHandle.GetCustomAttribute(reader).GetAttributeTypeHandle(reader);
HandleType handleType = typeHandle.HandleType;
if (handleType == HandleType.TypeDefinition)
{
TypeDefinition typeDefinition = typeHandle.ToTypeDefinitionHandle(reader).GetTypeDefinition(reader);
if (!typeDefinition.Name.StringEquals(name, reader))
{
return(false);
}
NamespaceDefinitionHandle nsHandle = typeDefinition.NamespaceDefinition;
int idx = namespaceParts.Length;
while (idx-- != 0)
{
String namespacePart = namespaceParts[idx];
NamespaceDefinition namespaceDefinition = nsHandle.GetNamespaceDefinition(reader);
if (!namespaceDefinition.Name.StringOrNullEquals(namespacePart, reader))
{
return(false);
}
if (!namespaceDefinition.ParentScopeOrNamespace.IsNamespaceDefinitionHandle(reader))
{
return(false);
}
nsHandle = namespaceDefinition.ParentScopeOrNamespace.ToNamespaceDefinitionHandle(reader);
}
if (!nsHandle.GetNamespaceDefinition(reader).Name.StringOrNullEquals(null, reader))
{
return(false);
}
return(true);
}
else if (handleType == HandleType.TypeReference)
{
TypeReference typeReference = typeHandle.ToTypeReferenceHandle(reader).GetTypeReference(reader);
if (!typeReference.TypeName.StringEquals(name, reader))
{
return(false);
}
if (!typeReference.ParentNamespaceOrType.IsNamespaceReferenceHandle(reader))
{
return(false);
}
NamespaceReferenceHandle nsHandle = typeReference.ParentNamespaceOrType.ToNamespaceReferenceHandle(reader);
int idx = namespaceParts.Length;
while (idx-- != 0)
{
String namespacePart = namespaceParts[idx];
NamespaceReference namespaceReference = nsHandle.GetNamespaceReference(reader);
if (!namespaceReference.Name.StringOrNullEquals(namespacePart, reader))
{
return(false);
}
if (!namespaceReference.ParentScopeOrNamespace.IsNamespaceReferenceHandle(reader))
{
return(false);
}
nsHandle = namespaceReference.ParentScopeOrNamespace.ToNamespaceReferenceHandle(reader);
}
if (!nsHandle.GetNamespaceReference(reader).Name.StringOrNullEquals(null, reader))
{
return(false);
}
return(true);
}
else
{
throw new NotSupportedException();
}
}
internal RuntimeNormalCustomAttributeData(ReflectionDomain reflectionDomain, MetadataReader reader, CustomAttributeHandle customAttributeHandle)
{
_reflectionDomain = reflectionDomain;
_reader = reader;
_customAttribute = customAttributeHandle.GetCustomAttribute(reader);
}
internal RuntimeNormalCustomAttributeData(MetadataReader reader, CustomAttributeHandle customAttributeHandle)
{
_reader = reader;
_customAttribute = customAttributeHandle.GetCustomAttribute(reader);
}
internal EcmaCustomAttributeData(CustomAttributeHandle handle, EcmaModule module)
{
_handle = handle;
_module = module;
_neverAccessThisExceptThroughCustomAttributeProperty = handle.GetCustomAttribute(Reader);
}
internal NativeFormatCustomAttributeData(MetadataReader reader, CustomAttributeHandle customAttributeHandle)
{
_reader = reader;
_customAttribute = customAttributeHandle.GetCustomAttribute(reader);
}
internal RuntimeNormalCustomAttributeData(ReflectionDomain reflectionDomain, MetadataReader reader, CustomAttributeHandle customAttributeHandle)
{
_reflectionDomain = reflectionDomain;
_reader = reader;
_customAttribute = customAttributeHandle.GetCustomAttribute(reader);
}