.NET 6.0とMagicOnionで実現するgRPC通信（Windowsフォーム）v2

.NET 6.0 の Windowsフォームアプリから、MagicOnion NuGetパッケージを使い、gRPC通信処理を行うサンプルを作成しました。
前回作成したサンプルに、データクラスを使うパターンを追加実装しました。
MagicOnionでデータクラスを通信する際は、MessagePackを使ったシリアライズ/デシリアライズが必須になります。
ソースコードはGitHubで公開しています。

.Net Frameworkで実装されたクライアントサーバシステムを .NET 6.0へ移行するにあたり、MagicOnion Nugetパッケージを使用すると、gRPC通信を使ったクライアントサーバシステムへ簡単に移行できます。

.Net Framework+WCF で実装されたクライアントサーバシステムを、.NET 6.0+WCF Core へ移行し古いHTTTPプロトコルで通信し続けるよりは、HTTP/2のgRPC通信へ移行することが推奨されています。
WCF 開発者に gRPC を推奨する理由 – WCF 開発者向け gRPC | Microsoft Learn

MagicOnionを使うと簡単にクライアント・サーバシステムでgRPC通信を実現できます。
.NETでクライアント・サーバシステムを開発する場合、通信処理はMagicOnionでgRPC通信を実装するのが主流になりそうです。

GitHubのMagicOnion プロジェクトサイトには、MagicOnion開発リポジトリ、インストール手順などがありわかり易いです。
Cysharp/MagicOnion: Unified Realtime/API framework for .NET Platform and Unity (github.com)

MagicOnion 通信インターフェース定義

ソースコード構成

最初に、サーバ側とクライアント側で使用する共通ライブラリとして、通信処理のインターフェースとデータモデルの定義を作成します。
今回使った Visual Studio プロジェクトテンプレートは、Visual Studio 2022 + .NET 6.0 + クラスライブラリです。

テンプレートに対して、下記のインターフェース定義とデータモデル定義を加えました。

ソースコード変更内容を解説

/ClassLibrary1.csproj

MagicOnion NuGetパッケージをインストール。


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

  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="MagicOnion" Version="5.1.2" />
  </ItemGroup>

</Project>

<ImplicitUsings>enable</ImplicitUsings>

<Nullable>enable</Nullable>

</PropertyGroup>

</ItemGroup>

</Project>

/Model/ModelClassA.cs

通信する際のデータクラスを作成。


using MessagePack;

namespace ClassLibrary1.Model
{
    [MessagePackObject]
    public class ModelClassA
    {
        [Key("IntA")] 
        public int IntA { get; set; }

        [Key("StringA")] 
        public string StringA { get; set; }
    }
}

using MessagePack;

namespace ClassLibrary1.Model

{

[MessagePackObject]

public class ModelClassA

{

[Key("IntA")]

public int IntA { get; set; }

[Key("StringA")]

public string StringA { get; set; }

}

/Interface/IMyFirstService.cs

通信する際のインターフェースを作成。


using MagicOnion;
using ClassLibrary1.Model;

namespace ClassLibrary1.Interface
{
    // Defines .NET interface as a Server/Client IDL.
    // The interface is shared between server and client.
    public interface IMyFirstService : IService<IMyFirstService>
    {
        // The return type must be `UnaryResult<T>` or `UnaryResult`.
        UnaryResult<int> SumAsync(int x, int y);

        UnaryResult<ModelClassA> Sum2Async(ModelClassA modelClassA1, ModelClassA modelClassA2);
        
    }
}

using MagicOnion;

using ClassLibrary1.Model;

namespace ClassLibrary1.Interface

{

// Defines .NET interface as a Server/Client IDL.

// The interface is shared between server and client.

public interface IMyFirstService : IService<IMyFirstService>

{

// The return type must be `UnaryResult<T>` or `UnaryResult`.

UnaryResult<int> SumAsync(int x, int y);

UnaryResult<ModelClassA> Sum2Async(ModelClassA modelClassA1, ModelClassA modelClassA2);

}

MagicOnion サーバ側

ソースコード構成

今回使った Visual Studio プロジェクトテンプレートは、Visual Studio 2022 + .NET 6.0 + ASP.NET Core（空）アプリです。

テンプレートに対して、下記の処理を加えました。

ソースコード変更内容を解説

/WebApplication1.sln

・MagicOnion通信インターフェース定義で作成したクラスライブラリをソリューションに追加。


Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.5.33414.496
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WebApplication1", "WebApplication1\WebApplication1.csproj", "{8579F926-C7C2-44E0-B364-750F33BD5935}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ClassLibrary1", "..\ClassLibrary1\ClassLibrary1\ClassLibrary1.csproj", "{74152DB1-DCF4-401F-8946-D877CBEF580D}"
EndProject
Global
	GlobalSection(SolutionConfigurationPlatforms) = preSolution
		Debug|Any CPU = Debug|Any CPU
		Release|Any CPU = Release|Any CPU
	EndGlobalSection
	GlobalSection(ProjectConfigurationPlatforms) = postSolution
		{8579F926-C7C2-44E0-B364-750F33BD5935}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{8579F926-C7C2-44E0-B364-750F33BD5935}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{8579F926-C7C2-44E0-B364-750F33BD5935}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{8579F926-C7C2-44E0-B364-750F33BD5935}.Release|Any CPU.Build.0 = Release|Any CPU
		{74152DB1-DCF4-401F-8946-D877CBEF580D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{74152DB1-DCF4-401F-8946-D877CBEF580D}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{74152DB1-DCF4-401F-8946-D877CBEF580D}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{74152DB1-DCF4-401F-8946-D877CBEF580D}.Release|Any CPU.Build.0 = Release|Any CPU
	EndGlobalSection
	GlobalSection(SolutionProperties) = preSolution
		HideSolutionNode = FALSE
	EndGlobalSection
	GlobalSection(ExtensibilityGlobals) = postSolution
		SolutionGuid = {005A561F-B239-4763-ABF6-56EE58856632}
	EndGlobalSection
EndGlobal

Microsoft Visual Studio Solution File, Format Version 12.00

# Visual Studio Version 17

VisualStudioVersion = 17.5.33414.496

MinimumVisualStudioVersion = 10.0.40219.1

Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WebApplication1", "WebApplication1\WebApplication1.csproj", "{8579F926-C7C2-44E0-B364-750F33BD5935}"

EndProject

Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ClassLibrary1", "..\ClassLibrary1\ClassLibrary1\ClassLibrary1.csproj", "{74152DB1-DCF4-401F-8946-D877CBEF580D}"

EndProject

Global

GlobalSection(SolutionConfigurationPlatforms) = preSolution

Debug|Any CPU = Debug|Any CPU

Release|Any CPU = Release|Any CPU

EndGlobalSection

GlobalSection(ProjectConfigurationPlatforms) = postSolution

{8579F926-C7C2-44E0-B364-750F33BD5935}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

{8579F926-C7C2-44E0-B364-750F33BD5935}.Debug|Any CPU.Build.0 = Debug|Any CPU

{8579F926-C7C2-44E0-B364-750F33BD5935}.Release|Any CPU.ActiveCfg = Release|Any CPU

{8579F926-C7C2-44E0-B364-750F33BD5935}.Release|Any CPU.Build.0 = Release|Any CPU

{74152DB1-DCF4-401F-8946-D877CBEF580D}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

{74152DB1-DCF4-401F-8946-D877CBEF580D}.Debug|Any CPU.Build.0 = Debug|Any CPU

{74152DB1-DCF4-401F-8946-D877CBEF580D}.Release|Any CPU.ActiveCfg = Release|Any CPU

{74152DB1-DCF4-401F-8946-D877CBEF580D}.Release|Any CPU.Build.0 = Release|Any CPU

EndGlobalSection

GlobalSection(SolutionProperties) = preSolution

HideSolutionNode = FALSE

EndGlobalSection

GlobalSection(ExtensibilityGlobals) = postSolution

SolutionGuid = {005A561F-B239-4763-ABF6-56EE58856632}

EndGlobalSection

EndGlobal

/WebApplication1/WebApplication1.csproj

Grpc.AspNetCore/MagicOnion.Server NuGetパッケージをインストール。

/WebApplication1/Program.cs

MagicOnion.Serverのサービス開始処理を追加。


using MagicOnion;
using MagicOnion.Server;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddGrpc();
builder.Services.AddMagicOnion();

var app = builder.Build();

app.MapMagicOnionService();

app.MapGet("/", () => "Hello World!");

app.Run();

using MagicOnion;

using MagicOnion.Server;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddGrpc();

builder.Services.AddMagicOnion();

var app = builder.Build();

app.MapMagicOnionService();

app.MapGet("/", () => "Hello World!");

app.Run();

/WebApplication1/Services/MyFirstService.cs

interfaceに対応するサーバ側の処理を作成。


using MagicOnion.Server;
using MagicOnion;
using ClassLibrary1.Interface;
using ClassLibrary1.Model;

namespace WebApplication1.Services
{
    // Implements RPC service in the server project.
    // The implementation class must inherit `ServiceBase<IMyFirstService>` and `IMyFirstService`
    public class MyFirstService : ServiceBase<IMyFirstService>, IMyFirstService
    {
        // `UnaryResult<T>` allows the method to be treated as `async` method.
        public async UnaryResult<int> SumAsync(int x, int y)
        {
            Console.WriteLine($"Received:{x}, {y}");
            return x + y;
        }

        public async UnaryResult<ModelClassA> Sum2Async(ModelClassA modelClassA1, ModelClassA modelClassA2)
        {
            var ModelClassA = new ModelClassA()
            {
                IntA = modelClassA1.IntA + modelClassA2.IntA,
                StringA = modelClassA1.StringA + modelClassA2.StringA,
            };

            return ModelClassA;
        }

    }
}

using MagicOnion.Server;

using MagicOnion;

using ClassLibrary1.Interface;

using ClassLibrary1.Model;

namespace WebApplication1.Services

{

// Implements RPC service in the server project.

// The implementation class must inherit `ServiceBase<IMyFirstService>` and `IMyFirstService`

public class MyFirstService : ServiceBase<IMyFirstService>, IMyFirstService

{

// `UnaryResult<T>` allows the method to be treated as `async` method.

public async UnaryResult<int> SumAsync(int x, int y)

{

Console.WriteLine($"Received:{x}, {y}");

return x + y;

}

public async UnaryResult<ModelClassA> Sum2Async(ModelClassA modelClassA1, ModelClassA modelClassA2)

{

var ModelClassA = new ModelClassA()

{

IntA = modelClassA1.IntA + modelClassA2.IntA,

StringA = modelClassA1.StringA + modelClassA2.StringA,

};

return ModelClassA;

}

MagicOnion クライアント側

ソースコード構成

今回使った Visual Studio プロジェクトテンプレートは、Visual Studio 2022 + .NET 6.0 + Windowsフォームアプリです。

テンプレートに対して、下記の処理を加えました。

ソースコード変更内容を解説

/WinFormsApp1.sln

MagicOnion通信インターフェース定義で作成したクラスライブラリをソリューションに追加。


Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.5.33414.496
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WinFormsApp1", "WinFormsApp1\WinFormsApp1.csproj", "{570826E4-29AD-4D28-8325-26FD152AAFA2}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ClassLibrary1", "..\ClassLibrary1\ClassLibrary1\ClassLibrary1.csproj", "{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}"
EndProject
Global
	GlobalSection(SolutionConfigurationPlatforms) = preSolution
		Debug|Any CPU = Debug|Any CPU
		Release|Any CPU = Release|Any CPU
	EndGlobalSection
	GlobalSection(ProjectConfigurationPlatforms) = postSolution
		{570826E4-29AD-4D28-8325-26FD152AAFA2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{570826E4-29AD-4D28-8325-26FD152AAFA2}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{570826E4-29AD-4D28-8325-26FD152AAFA2}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{570826E4-29AD-4D28-8325-26FD152AAFA2}.Release|Any CPU.Build.0 = Release|Any CPU
		{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Release|Any CPU.Build.0 = Release|Any CPU
	EndGlobalSection
	GlobalSection(SolutionProperties) = preSolution
		HideSolutionNode = FALSE
	EndGlobalSection
	GlobalSection(ExtensibilityGlobals) = postSolution
		SolutionGuid = {BDE73763-EB41-46C8-998F-760AA69620C4}
	EndGlobalSection
EndGlobal

Microsoft Visual Studio Solution File, Format Version 12.00

# Visual Studio Version 17

VisualStudioVersion = 17.5.33414.496

MinimumVisualStudioVersion = 10.0.40219.1

Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WinFormsApp1", "WinFormsApp1\WinFormsApp1.csproj", "{570826E4-29AD-4D28-8325-26FD152AAFA2}"

EndProject

Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ClassLibrary1", "..\ClassLibrary1\ClassLibrary1\ClassLibrary1.csproj", "{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}"

EndProject

Global

GlobalSection(SolutionConfigurationPlatforms) = preSolution

Debug|Any CPU = Debug|Any CPU

Release|Any CPU = Release|Any CPU

EndGlobalSection

GlobalSection(ProjectConfigurationPlatforms) = postSolution

{570826E4-29AD-4D28-8325-26FD152AAFA2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

{570826E4-29AD-4D28-8325-26FD152AAFA2}.Debug|Any CPU.Build.0 = Debug|Any CPU

{570826E4-29AD-4D28-8325-26FD152AAFA2}.Release|Any CPU.ActiveCfg = Release|Any CPU

{570826E4-29AD-4D28-8325-26FD152AAFA2}.Release|Any CPU.Build.0 = Release|Any CPU

{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Debug|Any CPU.ActiveCfg = Debug|Any CPU

{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Debug|Any CPU.Build.0 = Debug|Any CPU

{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Release|Any CPU.ActiveCfg = Release|Any CPU

{58F003E2-3F75-4AB7-B63C-B44BB0E3A089}.Release|Any CPU.Build.0 = Release|Any CPU

EndGlobalSection

GlobalSection(SolutionProperties) = preSolution

HideSolutionNode = FALSE

EndGlobalSection

GlobalSection(ExtensibilityGlobals) = postSolution

SolutionGuid = {BDE73763-EB41-46C8-998F-760AA69620C4}

EndGlobalSection

EndGlobal

/WinFormsApp1/WinFormsApp1.csproj

・MagicOnion.Client NuGetパッケージをインストール。


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

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net6.0-windows</TargetFramework>
    <Nullable>enable</Nullable>
    <UseWindowsForms>true</UseWindowsForms>
    <ImplicitUsings>enable</ImplicitUsings>
  </PropertyGroup>

  <ItemGroup>
    <Compile Remove="Model\**" />
    <Compile Remove="Shared\**" />
    <EmbeddedResource Remove="Model\**" />
    <EmbeddedResource Remove="Shared\**" />
    <None Remove="Model\**" />
    <None Remove="Shared\**" />
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="MagicOnion.Client" Version="5.1.2" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\..\ClassLibrary1\ClassLibrary1\ClassLibrary1.csproj" />
  </ItemGroup>

</Project>

<OutputType>WinExe</OutputType>

<TargetFramework>net6.0-windows</TargetFramework>

<Nullable>enable</Nullable>

<ImplicitUsings>enable</ImplicitUsings>

</PropertyGroup>

</ItemGroup>

</ItemGroup>

</ItemGroup>

</Project>

/WinFormsApp1/Form1.Designer.cs/WinFormsApp1/Form1.resx

動作を確認する為に最低限の画面を作成。

/WinFormsApp1/Form1.cs

ボタンのクリックイベントに、interfaceを通しサーバ側の SumAsync()/Sum2Asyn()メソッドを呼び出す処理を作成。


using ClassLibrary1.Interface;
using ClassLibrary1.Model;
using Grpc.Net.Client;
using MagicOnion.Client;

namespace WinFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private async void button1_Click(object sender, EventArgs e)
        {
            // Connect to the server using gRPC channel.
            var channel = GrpcChannel.ForAddress("https://localhost:7061");

            // Create a proxy to call the server transparently.
            var client = MagicOnionClient.Create<IMyFirstService>(channel);

            // Call the server-side method using the proxy.
            var result = (await client.SumAsync(123, 456));
            textBox1.Text = result.ToString();

            var modelClassA1 = new ModelClassA()
            {
                IntA = 1,
                StringA = "aa"
            };
            var modelClassA2 = new ModelClassA()
            {
                IntA = 2,
                StringA = "bb"
            };
            var resultModelClassA = (await client.Sum2Async(modelClassA1, modelClassA2));
            textBox1.Text = resultModelClassA.IntA.ToString() + " " + resultModelClassA.StringA;
        }
    }
}

using ClassLibrary1.Interface;

using ClassLibrary1.Model;

using Grpc.Net.Client;

using MagicOnion.Client;

namespace WinFormsApp1

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private async void button1_Click(object sender, EventArgs e)

{

// Connect to the server using gRPC channel.

var channel = GrpcChannel.ForAddress("https://localhost:7061");

// Create a proxy to call the server transparently.

var client = MagicOnionClient.Create<IMyFirstService>(channel);

// Call the server-side method using the proxy.

var result = (await client.SumAsync(123, 456));

textBox1.Text = result.ToString();

var modelClassA1 = new ModelClassA()

{

IntA = 1,

StringA = "aa"

};

var modelClassA2 = new ModelClassA()

{

IntA = 2,

StringA = "bb"

};

var resultModelClassA = (await client.Sum2Async(modelClassA1, modelClassA2));

textBox1.Text = resultModelClassA.IntA.ToString() + " " + resultModelClassA.StringA;

}

補足

通信するデータクラスにMessagePackObject/Key属性を付与していないと、MagicOnionの通信実行時に、「MessagePackSerializationException: Failed to serialize」エラーが発生します。
通信する必要のないプロパティは [IgnoreMember]属性を加えると解消します。


Grpc.Core.RpcException: 'Status(StatusCode="Internal", Detail="Error starting gRPC call. MessagePackSerializationException: Failed to serialize WebApplication1.Model.ModelClassA value. FormatterNotRegisteredException: WebApplication1.Model.ModelClassA is not registered in resolver: MessagePack.Resolvers.StandardResolver", DebugException="MessagePack.MessagePackSerializationException: Failed to serialize WebApplication1.Model.ModelClassA value.
 ---> MessagePack.FormatterNotRegisteredException: WebApplication1.Model.ModelClassA is not registered in resolver: MessagePack.Resolvers.StandardResolver
   at MessagePack.FormatterResolverExtensions.Throw(Type t, IFormatterResolver resolver)
   at MessagePack.MessagePackSerializer.Serialize[T](MessagePackWriter& writer, T value, MessagePackSerializerOptions options)
   --- End of inner exception stack trace ---
   at MessagePack.MessagePackSerializer.Serialize[T](MessagePackWriter& writer, T value, MessagePackSerializerOptions options)
   at MessagePack.MessagePackSerializer.Serialize[T](IBufferWriter`1 writer, T value, MessagePackSerializerOptions options, CancellationToken cancellationToken)
   at MagicOnion.Serialization.MessagePackMagicOnionSerializerProvider.MessagePackMagicOnionSerializer.Serialize[T](IBufferWriter`1 writer, T& value)
   at MagicOnion.GrpcMethodHelper.<>c__DisplayClass8_0`1.<CreateMarshaller>b__0(T obj, SerializationContext ctx)
   at Grpc.Net.Client.StreamExtensions.WriteMessageAsync[TMessage](Stream stream, GrpcCall call, TMessage message, Action`2 serializer, CallOptions callOptions)
   at Grpc.Net.Client.Internal.PushUnaryContent`2.WriteMessageCore(ValueTask writeMessageTask)
   at System.Net.Http.Http2Connection.Http2Stream.SendRequestBodyAsync(CancellationToken cancellationToken)
   at System.Net.Http.Http2Connection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
   at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
   at Grpc.Net.Client.Internal.GrpcCall`2.RunCall(HttpRequestMessage request, Nullable`1 timeout)")'

Grpc.Core.RpcException: 'Status(StatusCode="Internal", Detail="Error starting gRPC call. MessagePackSerializationException: Failed to serialize WebApplication1.Model.ModelClassA value. FormatterNotRegisteredException: WebApplication1.Model.ModelClassA is not registered in resolver: MessagePack.Resolvers.StandardResolver", DebugException="MessagePack.MessagePackSerializationException: Failed to serialize WebApplication1.Model.ModelClassA value.

---> MessagePack.FormatterNotRegisteredException: WebApplication1.Model.ModelClassA is not registered in resolver: MessagePack.Resolvers.StandardResolver

at MessagePack.FormatterResolverExtensions.Throw(Type t, IFormatterResolver resolver)

at MessagePack.MessagePackSerializer.Serialize[T](MessagePackWriter& writer, T value, MessagePackSerializerOptions options)

--- End of inner exception stack trace ---

at MessagePack.MessagePackSerializer.Serialize[T](MessagePackWriter& writer, T value, MessagePackSerializerOptions options)

at MessagePack.MessagePackSerializer.Serialize[T](IBufferWriter`1 writer, T value, MessagePackSerializerOptions options, CancellationToken cancellationToken)

at MagicOnion.Serialization.MessagePackMagicOnionSerializerProvider.MessagePackMagicOnionSerializer.Serialize[T](IBufferWriter`1 writer, T& value)

at MagicOnion.GrpcMethodHelper.<>c__DisplayClass8_0`1.<CreateMarshaller>b__0(T obj, SerializationContext ctx)

at Grpc.Net.Client.StreamExtensions.WriteMessageAsync[TMessage](Stream stream, GrpcCall call, TMessage message, Action`2 serializer, CallOptions callOptions)

at Grpc.Net.Client.Internal.PushUnaryContent`2.WriteMessageCore(ValueTask writeMessageTask)

at System.Net.Http.Http2Connection.Http2Stream.SendRequestBodyAsync(CancellationToken cancellationToken)

at System.Net.Http.Http2Connection.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)

at System.Net.Http.HttpConnectionPool.SendWithVersionDetectionAndRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)

at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)

at Grpc.Net.Client.Internal.GrpcCall`2.RunCall(HttpRequestMessage request, Nullable`1 timeout)")'

[Key][IgnoreMember]属性を設定していても、[Key(〇〇〇)]属性の〇〇〇パラメータが重複している場合、「Exception was thrown by handler.」例外が発生します。


Grpc.Core.RpcException: 'Status(StatusCode="Unknown", Detail="Exception was thrown by handler.")'

Grpc.Core.RpcException: 'Status(StatusCode="Unknown", Detail="Exception was thrown by handler.")'