|
| 1 | +--- |
| 2 | +title: "Breaking change: Replace DAMT.All with more restricted annotation on InvokeMember/FindMembers/DeclaredMembers" |
| 3 | +description: Learn about the .NET 10 breaking change in core .NET libraries where InvokeMember, FindMembers, and DeclaredMembers APIs use more restricted annotations instead of DAMT.All. |
| 4 | +ms.date: 10/22/2025 |
| 5 | +ai-usage: ai-assisted |
| 6 | +--- |
| 7 | +# Replace DAMT.All with more restricted annotation on InvokeMember/FindMembers/DeclaredMembers |
| 8 | + |
| 9 | +Starting in .NET 10, the <xref:System.Reflection.IReflect.InvokeMember%2A?displayProperty=nameWithType>, <xref:System.Type.FindMembers%2A?displayProperty=nameWithType>, and <xref:System.Reflection.TypeInfo.DeclaredMembers?displayProperty=nameWithType> APIs use more restricted annotations instead of `DAMT.All`. This change affects scenarios where you implement the <xref:System.Reflection.IReflect> interface or derive from <xref:System.Reflection.TypeInfo>. |
| 10 | + |
| 11 | +## Version introduced |
| 12 | + |
| 13 | +.NET 10 Preview 1 |
| 14 | + |
| 15 | +## Previous behavior |
| 16 | + |
| 17 | +Previously, the `InvokeMember`, `FindMembers`, and `DeclaredMembers` APIs used the `DAMT.All` annotation, which was overly permissive. This could result in capturing additional members, such as interface methods implemented by a class, and potentially caused runtime warnings or unsafe reflection calls. |
| 18 | + |
| 19 | +```csharp |
| 20 | +public class MyType : IReflect |
| 21 | +{ |
| 22 | + public MethodInfo[] GetMethods(BindingFlags bindingAttr) |
| 23 | + { |
| 24 | + // Previous behavior: DAMT.All annotation applied |
| 25 | + // This could capture additional members, including interface methods implemented by the class |
| 26 | + } |
| 27 | +} |
| 28 | +``` |
| 29 | + |
| 30 | +## New behavior |
| 31 | + |
| 32 | +The `InvokeMember`, `FindMembers`, and `DeclaredMembers` APIs now use more restricted annotations, which provide better control over the members captured during reflection. You must update your annotations to match the new behavior if you implement <xref:System.Reflection.IReflect> or derive from <xref:System.Reflection.TypeInfo>. |
| 33 | + |
| 34 | +```csharp |
| 35 | +public class MyType : IReflect |
| 36 | +{ |
| 37 | + [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods)] |
| 38 | + public MethodInfo[] GetMethods(BindingFlags bindingAttr) |
| 39 | + { |
| 40 | + // New behavior: More restricted annotation applied |
| 41 | + // Only public methods are captured, avoiding unintended members |
| 42 | + } |
| 43 | +} |
| 44 | +``` |
| 45 | + |
| 46 | +## Type of breaking change |
| 47 | + |
| 48 | +This change can affect [source compatibility](../../categories.md#source-incompatible) and is a [behavioral change](../../categories.md#behavioral-change). |
| 49 | + |
| 50 | +## Reason for change |
| 51 | + |
| 52 | +The change was introduced to improve the accuracy of annotations in <xref:System.Reflection> APIs and to address issues caused by the overly permissive `DAMT.All` annotation. This ensures better compatibility with trimming and reflection scenarios, reduces runtime warnings, and prevents unsafe reflection calls. |
| 53 | + |
| 54 | +## Recommended action |
| 55 | + |
| 56 | +If you implement <xref:System.Reflection.IReflect> or derive from <xref:System.Reflection.TypeInfo>, review your code and update annotations to align with the new behavior. Specifically: |
| 57 | + |
| 58 | +1. Replace `DAMT.All` annotations with more restricted annotations, such as <xref:System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicMethods?displayProperty=nameWithType>, <xref:System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.NonPublicMethods?displayProperty=nameWithType>, or other appropriate types. |
| 59 | +1. Test reflection scenarios to ensure that the updated annotations capture the intended members and don't introduce runtime errors or warnings. |
| 60 | + |
| 61 | +**Before:** |
| 62 | + |
| 63 | +```csharp |
| 64 | +public class MyType : IReflect |
| 65 | +{ |
| 66 | + public MethodInfo[] GetMethods(BindingFlags bindingAttr) |
| 67 | + { |
| 68 | + // Previous behavior: DAMT.All annotation applied |
| 69 | + } |
| 70 | +} |
| 71 | +``` |
| 72 | + |
| 73 | +**After:** |
| 74 | + |
| 75 | +```csharp |
| 76 | +public class MyType : IReflect |
| 77 | +{ |
| 78 | + [DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicMethods)] |
| 79 | + public MethodInfo[] GetMethods(BindingFlags bindingAttr) |
| 80 | + { |
| 81 | + // New behavior: More restricted annotation applied |
| 82 | + } |
| 83 | +} |
| 84 | +``` |
| 85 | + |
| 86 | +## Affected APIs |
| 87 | + |
| 88 | +- <xref:System.Reflection.IReflect.InvokeMember%2A?displayProperty=fullName> |
| 89 | +- <xref:System.Type.FindMembers%2A?displayProperty=fullName> |
| 90 | +- <xref:System.Reflection.TypeInfo.DeclaredMembers?displayProperty=fullName> |
| 91 | + |
| 92 | +## See also |
| 93 | + |
| 94 | +- [Prepare .NET libraries for trimming](/dotnet/core/deploying/trimming/prepare-libraries-for-trimming) |
0 commit comments