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Merged
merged 6 commits into from
Dec 12, 2023
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Create intial page for CS8355 #38699

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dc8c67c
Create initial page for CS8355
BartoszKlonowski Dec 10, 2023
c9410fd
Remove CS8355 from list of not yet documented errors
BartoszKlonowski Dec 10, 2023
2cff456
Correct the link to default marshalling behavior page
BartoszKlonowski Dec 10, 2023
b6ceaf6
Remove not yet existing CS8328 page link
BartoszKlonowski Dec 10, 2023
39ab170
Reword passing as value and reference to read only and writable
BartoszKlonowski Dec 11, 2023
d8feddb
Add new CS8355 to the TOC
BartoszKlonowski Dec 11, 2023
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35 changes: 35 additions & 0 deletions docs/csharp/language-reference/compiler-messages/cs8355.md
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---
description: "Compiler Error CS8355"
title: "Compiler Error CS8355"
ms.date: 12/10/2023
f1_keywords:
- "CS8355"
helpviewer_keywords:
- "CS8355"
---
# Compiler Error CS8355

An in parameter cannot have the Out attribute.

The parameter of a method can't be declared as read only, while informing interop marshaler to treat this parameter as writable by the native code.
<br/><xref:System.Runtime.InteropServices.OutAttribute> will contradict to the `in` keyword when [marshalling](../../../standard/native-interop/type-marshalling.md).

## Example

The following sample generates CS8355:

```csharp
using System.Runtime.InteropServices;

class Program
{
public static void Example([Out] in int value) // CS8355
{
}
}
```

## See also

- [Default Marshalling Behavior](../../../framework/interop/default-marshalling-behavior.md)
- [Reference parameters](../keywords/method-parameters.md#reference-parameters)
2 changes: 2 additions & 0 deletions docs/csharp/language-reference/compiler-messages/toc.yml
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Expand Up @@ -1608,6 +1608,8 @@ items:
href: cs8334.md
- name: CS8354
href: cs8354.md
- name: CS8355
href: cs8355.md
- name: CS8403
href: cs8403.md
- name: CS8410
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1 change: 0 additions & 1 deletion docs/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error.md
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Expand Up @@ -329,7 +329,6 @@ f1_keywords:
- "CS8349"
- "CS8350"
- "CS8353"
- "CS8355"
- "CS8356"
- "CS8357"
- "CS8359"
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