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Sep 15, 2025
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Add alternative error message for SEO #48477

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6 changes: 5 additions & 1 deletion docs/core/compatibility/sdk/8.0/custombuildeventargs.md
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Expand Up @@ -15,7 +15,11 @@ Previously, you could derive from any subclass of <xref:Microsoft.Build.Framewor

Starting in .NET 8, a build error is issued if your code uses any type derived from <xref:Microsoft.Build.Framework.BuildEventArgs> and you build using the .NET 8 version of MSBuild, that is, from the command line:

> Usage of unsecure BinaryFormatter during serialization of custom event type 'MyCustomBuildEventArgs'. This will be deprecated soon. Please use Extended*EventArgs instead. More info: <https://aka.ms/msbuild/eventargs>
> Usage of unsecure BinaryFormatter during serialization of custom event type 'MyCustomBuildEventArgs'. This will be deprecated soon. Please use Extended*EventArgs instead. More info: <https://aka.ms/msbuild/eventargs>.

In .NET 10, the error message was changed to:

> Custom event type 'MyCustomBuildEventArgs' is not supported as all custom event types were deprecated. Please use Extended*EventArgs instead. More info: <https://aka.ms/msbuild/eventargs>.

Starting from Visual Studio version 17.10, the same behavior applies to builds in Visual Studio.

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