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Add custom exception handlers to generated COM wrappers #114828

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08f039e
Add custom exception handler to COM Wrappers
dongle-the-gadget Apr 19, 2025
1a66148
Copy VTable Index exception logic over
dongle-the-gadget Apr 19, 2025
d5cef7e
Remove redundant marshaller in interface data
dongle-the-gadget Apr 19, 2025
5319da6
Remove redundant metadata name logic
dongle-the-gadget Apr 19, 2025
e86c58f
Remove leftover System.Text namespace
dongle-the-gadget Apr 19, 2025
cf6a5bf
Remove leftover null pattern matching
dongle-the-gadget Apr 19, 2025
d9804bb
Remove extra colon
dongle-the-gadget Apr 20, 2025
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18 changes: 17 additions & 1 deletion ...braries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/ComInterfaceGenerator.cs
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Expand Up @@ -389,14 +389,30 @@ private static IncrementalMethodStubGenerationContext CalculateStubInformation(M

var virtualMethodIndexData = new VirtualMethodIndexData(index, ImplicitThisParameter: true, direction, true, ExceptionMarshalling.Com);

MarshallingInfo exceptionMarshallingInfo;

if (generatedComInterfaceAttributeData.ExceptionToUnmanagedMarshaller is not null)
{
exceptionMarshallingInfo = CustomMarshallingInfoHelper.CreateNativeMarshallingInfoForNonSignatureElement(
environment.Compilation.GetTypeByMetadataName(TypeNames.System_Exception),
generatedComInterfaceAttributeData.ExceptionToUnmanagedMarshaller,
generatedComAttribute,
environment.Compilation,
generatorDiagnostics);
}
else
{
exceptionMarshallingInfo = new ComExceptionMarshalling();
}

return new IncrementalMethodStubGenerationContext(
signatureContext,
containingSyntaxContext,
methodSyntaxTemplate,
locations,
callConv.ToSequenceEqualImmutableArray(SyntaxEquivalentComparer.Instance),
virtualMethodIndexData,
new ComExceptionMarshalling(),
exceptionMarshallingInfo,
environment.EnvironmentFlags,
owningInterface,
declaringType,
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24 changes: 24 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/ComInterfaceInfo.cs
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Expand Up @@ -94,6 +94,9 @@ public static DiagnosticOrInterfaceInfo From(INamedTypeSymbol symbol, InterfaceD
if (!OptionsAreValid(symbol, syntax, interfaceAttributeData, baseAttributeData, out DiagnosticInfo? optionsDiagnostic))
return DiagnosticOrInterfaceInfo.From(optionsDiagnostic);

if (!ExceptionToUnmanagedMarshallerIsValid(syntax, interfaceAttributeData, out DiagnosticInfo? exceptionToUnmanagedMarshallerDiagnostic))
return DiagnosticOrInterfaceInfo.From(exceptionToUnmanagedMarshallerDiagnostic);

InterfaceInfo info = (
new ComInterfaceInfo(
ManagedTypeInfo.CreateTypeInfoForTypeSymbol(symbol),
Expand Down Expand Up @@ -285,6 +288,27 @@ private static bool OptionsAreValid(
return true;
}

private static bool ExceptionToUnmanagedMarshallerIsValid(
InterfaceDeclarationSyntax syntax,
GeneratedComInterfaceCompilationData attrSymbolInfo,
[NotNullWhen(false)] out DiagnosticInfo? exceptionToUnmanagedMarshallerDiagnostic)
{
if (attrSymbolInfo.ExceptionToUnmanagedMarshaller is INamedTypeSymbol exceptionToUnmanagedMarshallerType)
{
if (!exceptionToUnmanagedMarshallerType.IsAccessibleFromFileScopedClass(out var details))
{
exceptionToUnmanagedMarshallerDiagnostic = DiagnosticInfo.Create(
GeneratorDiagnostics.ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode,
syntax.Identifier.GetLocation(),
exceptionToUnmanagedMarshallerType.ToDisplayString(SymbolDisplayFormat.FullyQualifiedFormat).Replace(TypeNames.GlobalAlias, ""),
details);
return false;
}
}
exceptionToUnmanagedMarshallerDiagnostic = null;
return true;
}

/// <summary>
/// Returns true if there is 0 or 1 base Com interfaces (i.e. the inheritance is valid), and returns false when there are 2 or more base Com interfaces and sets <paramref name="diagnostic"/>.
/// </summary>
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12 changes: 12 additions & 0 deletions ...m.Runtime.InteropServices/gen/ComInterfaceGenerator/GeneratedComInterfaceAttributeData.cs
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Expand Up @@ -35,6 +35,7 @@ public static GeneratedComInterfaceData From(GeneratedComInterfaceCompilationDat
internal sealed record GeneratedComInterfaceCompilationData : InteropAttributeCompilationData
{
public ComInterfaceOptions Options { get; init; } = ComInterfaceOptions.ManagedObjectWrapper | ComInterfaceOptions.ComObjectWrapper;
public INamedTypeSymbol? ExceptionToUnmanagedMarshaller { get; init; }

public static bool TryGetGeneratedComInterfaceAttributeFromInterface(INamedTypeSymbol interfaceSymbol, [NotNullWhen(true)] out AttributeData? generatedComInterfaceAttribute)
{
Expand Down Expand Up @@ -70,6 +71,17 @@ public static GeneratedComInterfaceCompilationData GetDataFromAttribute(Attribut
Options = (ComInterfaceOptions)options.Value
};
}
if (args.TryGetValue(nameof(ExceptionToUnmanagedMarshaller), out TypedConstant exceptionToUnmanagedMarshaller))
{
if (exceptionToUnmanagedMarshaller.Value is not INamedTypeSymbol)
{
return null;
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We generally don't use null for logical flow. This would mean the return type should be updated. I don't think we should be failing in this case as it will silent and difficult to reason about. A diagnostic would be more appropriate.

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This was based on InteropAttributeDataExtensions.WithValuesFromNamedArguments, which returns null if an invalid StringMarshalling type is passed. I'm not sure how this is handled particularly by GeneratedComInterfaceAttributeData.

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I think this is another one of the cases where we use null as our "unable to parse" sentinel (and in the caller we check for null and emit a diagnostic and replace with a sentinel). Can you confirm?

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Unfortunately, it looks like there's no regards to null-checking here. Even today if you pass in an invalid type for StringMarshallingCustomType, i.e.

[GeneratedComInterface(StringMarshalling = StringMarshalling.Custom, StringMarshallingCustomType = typeof(string*))]
public partial interface Foo;

the generator fails with a generic error message from Roslyn:

Generator 'ComInterfaceGenerator' failed to generate source. It will not contribute to the output and compilation errors may occur as a result. Exception was of type 'NullReferenceException' with message 'Object reference not set to an instance of an object.'

}
generatedComInterfaceAttributeData = generatedComInterfaceAttributeData with
{
ExceptionToUnmanagedMarshaller = (INamedTypeSymbol)exceptionToUnmanagedMarshaller.Value
};
}
return generatedComInterfaceAttributeData;
}
}
Expand Down
9 changes: 9 additions & 0 deletions ...ibraries/System.Runtime.InteropServices/gen/ComInterfaceGenerator/GeneratorDiagnostics.cs
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Expand Up @@ -141,6 +141,15 @@ public class Ids
DiagnosticSeverity.Error,
isEnabledByDefault: true);

public static readonly DiagnosticDescriptor ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode =
DiagnosticDescriptorHelper.Create(
Ids.InvalidGeneratedComInterfaceAttributeUsage,
GetResourceString(nameof(SR.InvalidGeneratedComInterfaceAttributeUsageTitle)),
GetResourceString(nameof(SR.ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode)),
Category,
DiagnosticSeverity.Error,
isEnabledByDefault: true);

/// <inheritdoc cref="SR.InvalidExceptionMarshallingConfigurationMessage"/>
public static readonly DiagnosticDescriptor InvalidExceptionMarshallingConfiguration =
DiagnosticDescriptorHelper.Create(
Expand Down
3 changes: 3 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/Strings.resx
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Expand Up @@ -916,4 +916,7 @@
<data name="BaseInterfaceDefinedInOtherAssemblyTitle" xml:space="preserve">
<value>Specifying 'GeneratedComInterfaceAttribute' on an interface that has a base interface defined in another assembly is not supported</value>
</data>
<data name="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode" xml:space="preserve">
<value>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</value>
</data>
</root>
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.cs.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">Zařazovací typ vstupního bodu {0} pro typ {1} musí být typ s nejméně jedním atributem System.Runtime.InteropServices.CustomMarshallerAttribute, který tento typ určuje jako spravovaný typ.</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">Informace o zařazování se určily pro ElementIndirectionDepth {0}, ale informace o zařazování byly potřebné pouze pro {1} úrovně indirekce.</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.de.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">Der Marshallertyp "{0}" des Eintrittspunkts für den Typ "{1}" muss ein Typ mit mindestens einem "System.Runtime.InteropServices.CustomMarshallerAttribute" sein, der diesen Typ als verwalteten Typ angibt</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">Marshallinginformationen wurden für \"ElementIndirectionDepth\" {0}angegeben. Marshallinginformationen wurden jedoch nur für {1} Dereferenzierungsebene(n) benötigt.</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.es.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">El tipo de serializador de punto de entrada "{0}" para el tipo "{1}" debe ser un tipo con al menos un "System.Runtime.InteropServices.CustomMarshallerAttribute" que especifique este tipo como el tipo administrado</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">Se especificó información de serialización para “ElementIndirectionDepth” {0}, pero la información de serialización solo era necesaria para {1} niveles de direccionamiento indirecto</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.fr.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">Le type de marshaleur de point d’entrée « {0} » pour le type « {1} » doit être un type avec au moins un type « System.Runtime.InteropServices.CustomMarspiaerAttribute » qui spécifie ce type comme type managé</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">Des informations de marshaling ont été spécifiées pour « ElementIndirectionDepth » {0}, mais les informations de marshaling étaient uniquement nécessaires pour {1} niveau(s) d’indirection</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.it.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">Il tipo di marshaller del punto di ingresso '{0}' per il tipo '{1}' deve essere un tipo con almeno un elemento 'System.Runtime.InteropServices.CustomMarshallerAttribute' che specifica questo tipo come tipo gestito</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">Sono state specificate informazioni di marshalling per l'elemento 'ElementIndirectionDepth' {0}, ma le informazioni di marshalling sono necessarie solo per {1} livello/i di riferimento indiretto</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.ja.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">型 '{1}' 向けのエントリ ポイント マーシャラー型 '{0}' は、この型をマネージド型として指定する 'System.Runtime.InteropServices.CustomMarshallerAttribute' を 1 つ以上持つ型である必要があります</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">'ElementIndirectionDepth' {0} にマーシャリング情報が指定されましたが、マーシャリング情報は間接参照の {1} レベルにのみ必要です</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.ko.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">'{1}' 유형의 진입점 마샬러 유형 '{0}'은(는) 이 유형을 관리 유형으로 지정하는 'System.Runtime.InteropServices.CustomMarshallerAttribute'가 하나 이상 있는 유형이어야 합니다.</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">마샬링 정보가 'ElementIndirectionDepth' {0}에 대해 지정되었지만 마샬링 정보는 간접 참조 수준 {1}에만 필요했습니다.</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.pl.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">Typ marshallera punktu wejścia „{0}” dla typu „{1}” musi być typem z co najmniej jednym atrybutem „System.Runtime.InteropServices.CustomMarshaellerAttribute”, który określa ten typ jako typ zarządzany</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">Informacje dotyczące skierowania zostały określone dla elementu „ElementIndirectionDepth” {0}, ale informacje dotyczące skierowania były potrzebne tylko dla poziomów pośrednich w liczbie {1}</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.pt-BR.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">O tipo de empacotador de ponto de entrada '{0}' para o tipo '{1}' deve ser um tipo com pelo menos um 'System.Runtime.InteropServices.CustomMarshallerAttribute' que especifica esse tipo como o tipo gerenciado</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">As informações de marshalling foram especificadas para o {0} 'ElementIndirectionDepth', mas as informações de marshalling só eram necessárias para {1} nível(s) de indireção</target>
Expand Down
5 changes: 5 additions & 0 deletions src/libraries/System.Runtime.InteropServices/gen/Common/Resources/xlf/Strings.ru.xlf
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Expand Up @@ -392,6 +392,11 @@
<target state="translated">Тип маршалера точки входа "{0}" для типа "{1}" должен содержать хотя бы один атрибут "System.Runtime.InteropServices.CustomMarshallerAttribute", указывающий этот тип в качестве управляемого типа</target>
<note />
</trans-unit>
<trans-unit id="ExceptionToUnmanagedMarshallerNotAccessibleByGeneratedCode">
<source>The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</source>
<target state="new">The type '{0}' specified as 'GeneratedComInterfaceAttribute.ExceptionToUnmanagedMarshaller' is not accessible by generated code. The type must have at least 'internal' accessibility. {1}</target>
<note />
</trans-unit>
<trans-unit id="ExtraneousMarshallingInfo">
<source>Marshalling info was specified for 'ElementIndirectionDepth' {0}, but marshalling info was only needed for {1} level(s) of indirection</source>
<target state="translated">Для \"ElementIndirectionDepth\" {0} указаны сведения маршализации, но они необходимы только для {1} уровней косвенного обращения</target>
Expand Down
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