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Fix Deterministic compiler option default value documentation #47725

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Aug 6, 2025
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Fix Deterministic compiler option default value documentation #47725

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Fix Deterministic compiler option default value documentation
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6 changes: 5 additions & 1 deletion docs/csharp/language-reference/compiler-options/code-generation.md
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Expand Up @@ -87,7 +87,11 @@ Causes the compiler to produce an assembly whose byte-for-byte output is identic
<Deterministic>true</Deterministic>
```

By default, compiler output from a given set of inputs is unique, since the compiler adds a timestamp and an MVID (a <xref:System.Reflection.Module.ModuleVersionId%2A?displayProperty=nameWithType>. Basically it is a GUID that uniquely identifies the module and version.) that is generated from random numbers. You use the `<Deterministic>` option to produce a *deterministic assembly*, one whose binary content is identical across compilations as long as the input remains the same. In such a build, the timestamp and MVID fields will be replaced with values derived from a hash of all the compilation inputs. The compiler considers the following inputs that affect determinism:
For modern .NET projects, deterministic compilation is enabled by default (the `Deterministic` property defaults to `true`). When deterministic compilation is enabled, the timestamp and MVID fields are replaced with values derived from a hash of all the compilation inputs, ensuring identical binary output for identical inputs.

When deterministic compilation is disabled (`<Deterministic>false</Deterministic>`), compiler output from a given set of inputs is unique, since the compiler adds a timestamp and an MVID (a <xref:System.Reflection.Module.ModuleVersionId%2A?displayProperty=nameWithType>. Basically it is a GUID that uniquely identifies the module and version.) that is generated from random numbers.

You use the `<Deterministic>` option to produce a *deterministic assembly*, one whose binary content is identical across compilations as long as the input remains the same. The compiler considers the following inputs that affect determinism:

- The sequence of command-line parameters.
- The contents of the compiler's .rsp response file.
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