System.Xml.Serialization.TempAssembly.LoadGeneratedAssembly throws NullReferenceException from native host

[AArnott]

When hosting .NET Core in a native application, Assembly.GetEntryAssembly() returns null. The System.Xml.Serialization.TempAssembly.LoadGeneratedAssembly(Type, string, out XmlSerializerImplementation) method is not prepared for this and throws NullReferenceException.

runtime/src/libraries/System.Private.Xml/src/System/Xml/Serialization/Compilation.cs

Line 167 in 7c24ebc

if ((string.IsNullOrEmpty(serializerPath) || !File.Exists(serializerPath)) && !string.IsNullOrEmpty(Assembly.GetEntryAssembly().Location))

[StephenBonikowsky]

@AArnott Thanks for reporting this!

[ericstj]

Looks to me like this was assuming GetEntryAssembly() would never return null, but it does in this case as mentioned here: #25027 (comment)

A fix for this would be to handle null, and fall back to something like AppContext.BaseDirectory instead. Perhaps just replace this with AppContext.BaseDirectory.

[vladimir-cheverdyuk-altium]

I have exactly the same problem

[StephenMolloy]

Looks like this was already fixed by #40598. But #52429 also reworks this area of code to improve experiences here. Either way, I believe this issue has been addressed.