net11.0 
namespace Microsoft.Build.Framework
{
    public sealed class ExtendedCriticalBuildMessageEventArgs : CriticalBuildMessageEventArgs, IExtendedBuildEventArgs
    {
        public string? ExtendedData { get; set; }
    }
}
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Set property
.NET
10.011.0
.NET Framework
4.7.24.84.8.1
Information specific to net11.0
Assembly

Microsoft.Build.Framework , Version=15.1.0.0, PublicKeyToken=b03f5f7f11d50a3a

Referencing

Your project needs a package reference to Microsoft.Build.Framework.

Package Microsoft.Build.Framework (18.4.0) net10.0
Platform Restrictions

The property getter is supported on all platforms.

The property setter is supported on all platforms.

  • Built-in API
  • Package-provided API