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Code contracts are .NET Framework only #25619

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10 changes: 7 additions & 3 deletions docs/framework/debug-trace-profile/code-contracts.md
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---
title: "Code Contracts"
description: Explore code contracts, which provide a way to specify preconditions, postconditions, and object invariants in your .NET code.
titleSuffix: .NET Framework
description: "Explore code contracts, which provide a way to specify preconditions, postconditions, and object invariants in your .NET Framework code."
ms.date: "09/05/2018"
dev_langs:
- "csharp"
Expand All @@ -9,9 +10,12 @@ helpviewer_keywords:
- "Code contracts"
ms.assetid: 84526045-496f-489d-8517-a258cf76f040
---
# Code Contracts
# Code contracts (.NET Framework)

Code contracts provide a way to specify preconditions, postconditions, and object invariants in your code. Preconditions are requirements that must be met when entering a method or property. Postconditions describe expectations at the time the method or property code exits. Object invariants describe the expected state for a class that is in a good state.
Code contracts provide a way to specify preconditions, postconditions, and object invariants in .NET Framework code. Preconditions are requirements that must be met when entering a method or property. Postconditions describe expectations at the time the method or property code exits. Object invariants describe the expected state for a class that is in a good state.

> [!NOTE]
> Code contracts aren't supported in .NET 5+ (including .NET Core versions). Consider using [Nullable reference types](../../csharp/nullable-references.md) instead.

Code contracts include classes for marking your code, a static analyzer for compile-time analysis, and a runtime analyzer. The classes for code contracts can be found in the <xref:System.Diagnostics.Contracts> namespace.

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