JsonSerializer.Serialize stopped working with Blazor, throws MethodAccessException #55568

romfir · 2021-07-13T13:43:40Z

Description

When calling JsonSerializer.Serialize code throws MethodAccessException:

Uncaught (in promise) Error: System.MethodAccessException: Method `System.String.CopyTo(System.Span`1<char>)' is inaccessible from method `System.Text.Json.JsonCamelCaseNamingPolicy+<>c.<ConvertName>b__0_0(System.Span`1<char>,string)'
   at System.Text.Json.JsonCamelCaseNamingPolicy.<>c.<ConvertName>b__0_0(Span`1 chars, String name) in System.Text.Json.dll:token 0x6000140+0x0
   at System.String.Create[String](Int32 length, String state, SpanAction`2 action) in System.Private.CoreLib.dll:token 0x60004fc+0x2d
   at System.Text.Json.JsonCamelCaseNamingPolicy.ConvertName(String name) in System.Text.Json.dll:token 0x600013b+0x18
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo.DeterminePropertyName() in System.Text.Json.dll:token 0x6000832+0x4c
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo.GetPolicies(Nullable`1 ignoreCondition, Nullable`1 declaringTypeNumberHandling) in System.Text.Json.dll:token 0x6000831+0x17
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1[[System.Int32, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Initialize(Type parentClassType, Type declaredPropertyType, Type runtimePropertyType, ConverterStrategy runtimeClassType, MemberInfo memberInfo, Boolean isVirtual, JsonConverter converter, Nullable`1 ignoreCondition, Nullable`1 parentTypeNumberHandling, JsonSerializerOptions options) in System.Text.Json.dll:token 0x600087b+0x15e
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CreateProperty(Type declaredPropertyType, Type runtimePropertyType, MemberInfo memberInfo, Type parentClassType, Boolean isVirtual, JsonConverter converter, JsonSerializerOptions options, Nullable`1 parentTypeNumberHandling, Nullable`1 ignoreCondition) in System.Text.Json.dll:token 0x60008b2+0x8
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.AddProperty(MemberInfo memberInfo, Type memberType, Type parentClassType, Boolean isVirtual, Nullable`1 parentTypeNumberHandling, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60008b1+0x52
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CacheMember(Type declaringType, Type memberType, MemberInfo memberInfo, Boolean isVirtual, Nullable`1 typeNumberHandling, Dictionary`2& ignoredMembers) in System.Text.Json.dll:token 0x60008a4+0x34
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type, JsonConverter converter, Type runtimeType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60008a3+0x116
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60008a2+0x0
   at System.Text.Json.JsonSerializerOptions.<RootBuiltInConvertersAndTypeInfoCreator>g__CreateJsonTypeInfo|107_0(Type type, JsonSerializerOptions options) in System.Text.Json.dll:token 0x6000436+0x0
   at System.Text.Json.JsonSerializerOptions.GetClassFromContextOrCreate(Type type) in System.Text.Json.dll:token 0x600042c+0x29
   at System.Text.Json.JsonSerializerOptions.GetOrAddClass(Type type) in System.Text.Json.dll:token 0x600042b+0x17
   at System.Text.Json.JsonSerializerOptions.GetOrAddClassForRootType(Type type) in System.Text.Json.dll:token 0x600042d+0x1b
   at System.Text.Json.JsonSerializer.GetTypeInfo(Type runtimeType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x6000387+0x10
   at System.Text.Json.JsonSerializer.ReadUsingOptions[Object](Utf8JsonReader& reader, Type returnType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60003ba+0x0
   at System.Text.Json.JsonSerializer.Deserialize(Utf8JsonReader& reader, Type returnType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60003b7+0x14
   at Microsoft.JSInterop.Infrastructure.DotNetDispatcher.ParseArguments(JSRuntime jsRuntime, String methodIdentifier, String arguments, Type[] parameterTypes) in Microsoft.JSInterop.dll:token 0x600004e+0xaa
   at Microsoft.JSInterop.Infrastructure.DotNetDispatcher.InvokeSynchronously(JSRuntime jsRuntime, DotNetInvocationInfo& callInfo, IDotNetObjectReference objectReference, String argsJson) in Microsoft.JSInterop.dll:token 0x600004d+0x6f
   at Microsoft.JSInterop.Infrastructure.DotNetDispatcher.BeginInvokeDotNet(JSRuntime jsRuntime, DotNetInvocationInfo invocationInfo, String argsJson) in Microsoft.JSInterop.dll:token 0x600004b+0x4c
    at Object.endInvokeDotNetFromJS (blazor.webassembly.js:1)
    at Object.ut [as endInvokeDotNetFromJS] (blazor.webassembly.js:1)
    at Object.lt [as invokeJSFromDotNet] (blazor.webassembly.js:1)
    at _mono_wasm_invoke_js_blazor (dotnet.6.0.0-preview.5.21301.5.js:1)
    at <anonymous>:wasm-function[10629]:0x1930bb
    at <anonymous>:wasm-function[2450]:0x5972b
    at <anonymous>:wasm-function[2175]:0x4541e
    at <anonymous>:wasm-function[7878]:0x12d0c6
    at <anonymous>:wasm-function[7356]:0x116d09
    at <anonymous>:wasm-function[3341]:0x79023

steps to reproduce:

Create Blazor project
Add Test class to it

public class Test
    {
        public int X { get; set; }

        public int Y { get; set; }
    }

In Counter.razor add two lines to IncrementCount():

string json = JsonSerializer.Serialize(new Test { Y = 1, X = 2 });

Console.WriteLine(json);

Launch project, go to Counter page and click the button

Configuration

.NET version: 6.0.100-preview.5.21302.13

.csproj:

<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="6.0.0-preview.5.21301.17" />
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="6.0.0-preview.5.21301.17" PrivateAssets="all" />
    <PackageReference Include="System.Text.Json" Version="6.0.0-preview.7.21363.1" />
  </ItemGroup>

</Project>

The text was updated successfully, but these errors were encountered:

ghost · 2021-07-13T13:43:44Z

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

Issue Details

Description

When calling JsonSerializer.Serialize code throws MethodAccessException:

Uncaught (in promise) Error: System.MethodAccessException: Method `System.String.CopyTo(System.Span`1<char>)' is inaccessible from method `System.Text.Json.JsonCamelCaseNamingPolicy+<>c.<ConvertName>b__0_0(System.Span`1<char>,string)'
   at System.Text.Json.JsonCamelCaseNamingPolicy.<>c.<ConvertName>b__0_0(Span`1 chars, String name) in System.Text.Json.dll:token 0x6000140+0x0
   at System.String.Create[String](Int32 length, String state, SpanAction`2 action) in System.Private.CoreLib.dll:token 0x60004fc+0x2d
   at System.Text.Json.JsonCamelCaseNamingPolicy.ConvertName(String name) in System.Text.Json.dll:token 0x600013b+0x18
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo.DeterminePropertyName() in System.Text.Json.dll:token 0x6000832+0x4c
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo.GetPolicies(Nullable`1 ignoreCondition, Nullable`1 declaringTypeNumberHandling) in System.Text.Json.dll:token 0x6000831+0x17
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1[[System.Int32, System.Private.CoreLib, Version=6.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].Initialize(Type parentClassType, Type declaredPropertyType, Type runtimePropertyType, ConverterStrategy runtimeClassType, MemberInfo memberInfo, Boolean isVirtual, JsonConverter converter, Nullable`1 ignoreCondition, Nullable`1 parentTypeNumberHandling, JsonSerializerOptions options) in System.Text.Json.dll:token 0x600087b+0x15e
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CreateProperty(Type declaredPropertyType, Type runtimePropertyType, MemberInfo memberInfo, Type parentClassType, Boolean isVirtual, JsonConverter converter, JsonSerializerOptions options, Nullable`1 parentTypeNumberHandling, Nullable`1 ignoreCondition) in System.Text.Json.dll:token 0x60008b2+0x8
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.AddProperty(MemberInfo memberInfo, Type memberType, Type parentClassType, Boolean isVirtual, Nullable`1 parentTypeNumberHandling, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60008b1+0x52
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo.CacheMember(Type declaringType, Type memberType, MemberInfo memberInfo, Boolean isVirtual, Nullable`1 typeNumberHandling, Dictionary`2& ignoredMembers) in System.Text.Json.dll:token 0x60008a4+0x34
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type, JsonConverter converter, Type runtimeType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60008a3+0x116
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo..ctor(Type type, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60008a2+0x0
   at System.Text.Json.JsonSerializerOptions.<RootBuiltInConvertersAndTypeInfoCreator>g__CreateJsonTypeInfo|107_0(Type type, JsonSerializerOptions options) in System.Text.Json.dll:token 0x6000436+0x0
   at System.Text.Json.JsonSerializerOptions.GetClassFromContextOrCreate(Type type) in System.Text.Json.dll:token 0x600042c+0x29
   at System.Text.Json.JsonSerializerOptions.GetOrAddClass(Type type) in System.Text.Json.dll:token 0x600042b+0x17
   at System.Text.Json.JsonSerializerOptions.GetOrAddClassForRootType(Type type) in System.Text.Json.dll:token 0x600042d+0x1b
   at System.Text.Json.JsonSerializer.GetTypeInfo(Type runtimeType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x6000387+0x10
   at System.Text.Json.JsonSerializer.ReadUsingOptions[Object](Utf8JsonReader& reader, Type returnType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60003ba+0x0
   at System.Text.Json.JsonSerializer.Deserialize(Utf8JsonReader& reader, Type returnType, JsonSerializerOptions options) in System.Text.Json.dll:token 0x60003b7+0x14
   at Microsoft.JSInterop.Infrastructure.DotNetDispatcher.ParseArguments(JSRuntime jsRuntime, String methodIdentifier, String arguments, Type[] parameterTypes) in Microsoft.JSInterop.dll:token 0x600004e+0xaa
   at Microsoft.JSInterop.Infrastructure.DotNetDispatcher.InvokeSynchronously(JSRuntime jsRuntime, DotNetInvocationInfo& callInfo, IDotNetObjectReference objectReference, String argsJson) in Microsoft.JSInterop.dll:token 0x600004d+0x6f
   at Microsoft.JSInterop.Infrastructure.DotNetDispatcher.BeginInvokeDotNet(JSRuntime jsRuntime, DotNetInvocationInfo invocationInfo, String argsJson) in Microsoft.JSInterop.dll:token 0x600004b+0x4c
    at Object.endInvokeDotNetFromJS (blazor.webassembly.js:1)
    at Object.ut [as endInvokeDotNetFromJS] (blazor.webassembly.js:1)
    at Object.lt [as invokeJSFromDotNet] (blazor.webassembly.js:1)
    at _mono_wasm_invoke_js_blazor (dotnet.6.0.0-preview.5.21301.5.js:1)
    at <anonymous>:wasm-function[10629]:0x1930bb
    at <anonymous>:wasm-function[2450]:0x5972b
    at <anonymous>:wasm-function[2175]:0x4541e
    at <anonymous>:wasm-function[7878]:0x12d0c6
    at <anonymous>:wasm-function[7356]:0x116d09
    at <anonymous>:wasm-function[3341]:0x79023

steps to reproduce:

Create Blazor project
Add Test class to it

public class Test
    {
        public int X { get; set; }

        public int Y { get; set; }
    }

In Counter.razor add two lines to IncrementCount():

string json = JsonSerializer.Serialize(new Test { Y = 1, X = 2 });

Console.WriteLine(json);

Launch project, go to Counter page and click the button

Configuration

.NET version: 6.0.100-preview.5.21302.13

.csproj:

<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="6.0.0-preview.5.21301.17" />
    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="6.0.0-preview.5.21301.17" PrivateAssets="all" />
    <PackageReference Include="System.Text.Json" Version="6.0.0-preview.7.21363.1" />
  </ItemGroup>

</Project>

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

layomia · 2021-07-13T14:02:25Z

Thanks for opening this issue, @romfir. Did you happen to check if the issue still repros when using a slightly earlier build of System.Text.Json that doesn't contain the changes from #54526, e.g this build?

layomia · 2021-07-13T14:02:31Z

cc @pranavkm is this sort of issue familiar to you? Do you know why this method call could be failing with MethodAccessException in a blazorwasm app?

romfir · 2021-07-13T14:10:10Z

Thanks for opening this issue, @romfir. Did you happen to check if the issue still repros when using a slightly earlier build of System.Text.Json that doesn't contain the changes from #54526, e.g this build?

Same error with System.Text.Json 6.0.0-preview.7.21362.11:

layomia · 2021-07-13T14:21:15Z

@romfir does it repro when you disable trimming in the csproj?

<PropertyGroup>
    <PublishTrimmed>false</PublishTrimmed>
</PropertyGroup>

romfir · 2021-07-13T14:25:00Z

<PublishTrimmed>false</PublishTrimmed>

It does repro, but I don't think it matter, because I'm launching it via F5 with debug, without publishing

layomia · 2021-07-13T14:35:33Z

Thanks, I'll take a closer look here.

stephtr · 2021-07-17T16:45:22Z

~~It's actually not only failing in Blazor, I also get this issue for an ordinary MVC/WebAPI project.~~
Forget that, on my second development machine I accidentally still had the preview 4 SDK installed, despite referencing the preview 6 packages. With updating the SDK, I got rid of that exception.

steveharter · 2021-08-04T20:03:32Z

@stepht does the newer SDK fix the issue on Blazor? If so, this issue should be closed. Thanks

stephtr · 2021-08-04T20:11:48Z

My issue is fixed, I don't know what's with @romfir.

romfir · 2021-08-04T21:37:05Z

using rc.1 builds it no longer throws.

dotnet-issue-labeler bot added area-System.Text.Json untriaged New issue has not been triaged by the area owner labels Jul 13, 2021

romfir mentioned this issue Jul 13, 2021

Enable property visibility tests in source-gen mode #54526

Merged

layomia removed the untriaged New issue has not been triaged by the area owner label Jul 13, 2021

layomia self-assigned this Jul 13, 2021

layomia added this to the 6.0.0 milestone Jul 13, 2021

layomia added the bug label Jul 13, 2021

romfir closed this as completed Aug 4, 2021

ghost locked as resolved and limited conversation to collaborators Sep 3, 2021

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JsonSerializer.Serialize stopped working with Blazor, throws MethodAccessException #55568

JsonSerializer.Serialize stopped working with Blazor, throws MethodAccessException #55568

romfir commented Jul 13, 2021

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JsonSerializer.Serialize stopped working with Blazor, throws MethodAccessException #55568

JsonSerializer.Serialize stopped working with Blazor, throws MethodAccessException #55568

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romfir commented Jul 13, 2021

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