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Breaking change: ExceptionCollection constructor throws ArgumentException
Learn about the breaking change in .NET 8 for Windows Forms where the ExceptionCollection constructor now throws an exception if the input is not of type Exception.
02/06/2023

ExceptionCollection ctor throws ArgumentException

The xref:System.ComponentModel.Design.ExceptionCollection constructor now throws an xref:System.ArgumentException if the elements in the input array are not of type xref:System.Exception.

Version introduced

.NET 8 Preview 1

Previous behavior

Previously, the xref:System.ComponentModel.Design.ExceptionCollection constructor did not check the type passed in, which could delay failure until later in the process. No exceptions were thrown during object creation.

New behavior

Starting in .NET 8, if the elements in the input array are not of type xref:System.Exception, an xref:System.ArgumentException is thrown.

Change category

This change is a behavioral change.

Reason for change

This change helps to make exception types consistent across the code base.

Recommended action

For most scenarios, this change should not have a significant impact. However, consider updating your code to handle xref:System.ArgumentException at constructor call sites.

Affected APIs

  • xref:System.ComponentModel.Design.ExceptionCollection.%23ctor(System.Collections.ArrayList) constructor