[release/5.0] DataContractSerialization doesn't work with TrimMode - link #42911
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eerhardt
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DataContractSerialization has some Reflection "shim" methods that the ILLinker can't see through. This causes critical methods to be trimmed and applications to fail. These methods were put in place in .NET Core 1.0 when the full Reflection API wasn't available. The fix is to remove these "shim" Reflection APIs and use Reflection directly. Fix #41525 Fix #42754
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eerhardt
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jkotas,
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jkotas
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Sep 30, 2020
marek-safar
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Oct 1, 2020
pranavkm
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Oct 1, 2020
| @@ -392,7 +392,7 @@ internal static bool IsNonAttributedTypeValidForSerialization(Type type) | |||
| else | |||
| { | |||
| return (type.IsVisible && | |||
| type.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, Array.Empty<Type>()) != null); | |||
| type.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public, null, Array.Empty<Type>(), null) != null); | |||
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Is it uncommon to use named parameters in this codebase?
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No it isn't uncommon, but I'm not sure it adds a ton of value in these cases.
Note I've opened #42753 to make this overload an official API, so these nulls won't be necessary in the future.
| @@ -38,7 +38,7 @@ private static MethodInfo ObjectEquals | |||
| { | |||
| if (s_objectEquals == null) | |||
| { | |||
| s_objectEquals = Globals.TypeOfObject.GetMethod("Equals", BindingFlags.Public | BindingFlags.Static); | |||
| s_objectEquals = typeof(object).GetMethod("Equals", BindingFlags.Public | BindingFlags.Static); | |||
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I realize this isn't new, but could we specify the parameter types in the GetMethod call?
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We can do that in the master branch with this follow up issue: #42861.
|
@mconnew could you please sign off? should be a direct port of what you already approved. |
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Oct 1, 2020
leecow
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thanks! |
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Backport of #42824 to release/5.0
/cc @eerhardt
Customer Impact
DataContractSerializer doesn't work at all in an application that is trimmed with TrimMode=link. This includes Blazor WASM apps by default. It can also include any app that sets PublishTrimmed=true and TrimMode=link.
Customer reported, eg dotnet/aspnetcore#25909 (in Blazor) which shows up as a regression from earlier Blazor.
Testing
I tested the scenarios listed in both bugs logged for this issue, which were reading objects from a data stream:
#41525
#42754
I also tested that writing objects to a data stream works with trimming as well.
A new "trimming test" was added as well.
Risk
Low. This changes the way methods are discovered through Reflection in DataContractSerialization. Instead of doing its own filtering, it now uses the built-in Reflection APIs to find the method.