Unable to deserialize JSON

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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I'm referencing System.Text.Json NuGet package version 5.0.2. I'm not able to deserialize valid JSON file. The method JsonSerializer.Deserialize(string json, JsonSerializerOptions? options = null) throws following exception:

System.ExecutionEngineException: 'Attempting to JIT compile method 'int System.Text.Json.JsonWriterHelper:NeedsEscaping (System.ReadOnlySpan`1<byte>,System.Text.Encodings.Web.JavaScriptEncoder)' while running in aot-only mode. See https://docs.microsoft.com/xamarin/ios/internals/limitations for more information.

at System.Text.Json.JsonEncodedText.EncodeHelper (System.ReadOnlySpan`1[T] utf8Value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00000] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonEncodedText.TranscodeAndEncode (System.ReadOnlySpan`1[T] value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00033] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonEncodedText.Encode (System.ReadOnlySpan`1[T] value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00014] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonEncodedText.Encode (System.String value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00014] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonSerializer.. cctor () [0x00042] in <cb68364b029e41c3bf425990b94c94d9>:0 

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Original Comments

Feedback Bot on 7/1/2021, 01:35 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Václav Dajbych on 7/8/2021, 01:38 PM:

(private comment, text removed)

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Original Solutions

(no solutions)

[ghost]

Tagging subscribers to this area: @eiriktsarpalis, @layomia
See info in area-owners.md if you want to be subscribed.

Issue Details

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This issue has been moved from a ticket on Developer Community.

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I'm referencing System.Text.Json NuGet package version 5.0.2. I'm not able to deserialize valid JSON file. The method JsonSerializer.Deserialize(string json, JsonSerializerOptions? options = null) throws following exception:

System.ExecutionEngineException: 'Attempting to JIT compile method 'int System.Text.Json.JsonWriterHelper:NeedsEscaping (System.ReadOnlySpan`1<byte>,System.Text.Encodings.Web.JavaScriptEncoder)' while running in aot-only mode. See https://docs.microsoft.com/xamarin/ios/internals/limitations for more information.

at System.Text.Json.JsonEncodedText.EncodeHelper (System.ReadOnlySpan`1[T] utf8Value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00000] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonEncodedText.TranscodeAndEncode (System.ReadOnlySpan`1[T] value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00033] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonEncodedText.Encode (System.ReadOnlySpan`1[T] value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00014] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonEncodedText.Encode (System.String value, System.Text.Encodings.Web.JavaScriptEncoder encoder) [0x00014] in <cb68364b029e41c3bf425990b94c94d9>:0 
  at System.Text.Json.JsonSerializer.. cctor () [0x00042] in <cb68364b029e41c3bf425990b94c94d9>:0 

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Original Comments

Feedback Bot on 7/1/2021, 01:35 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

Václav Dajbych on 7/8/2021, 01:38 PM:

(private comment, text removed)

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Original Solutions

(no solutions)

Author:	vsfeedback
Assignees:	-
Labels:	area-System.Text.Json, untriaged
Milestone:	-

[danmoseley]

#56533
#47114
#55503

seems it's fixed -- perhaps there is a workaround we can share with this customer?

[eiriktsarpalis]

cc @MaximLipnin

[dajbych]

@danmoseley I have updated Visual Studio 2019 to version 16.11.1 and Xamarin.iOS SDK to version 14.20.0.25. This error remains.