. Net core 3.0 grpc custom service

Server side

newly build gRPC project

Right click Protos Folder –> Create a new one .proto, Select the protocol buffer file , Used to describe gRPC Messages and services for

Name at will , It's called UpImg Well

Then put the package name , The service name , Modify the parameter and return value names

Set the default method name SayHello And parameters and return values are also modified

Change to our own defined parameters and return values

Create a new one UpImgService, Implement what we just defined above gRPC The service description UpImg.proto

Note that the new service cannot be found by direct implementation

Because it's not there yet obj\Debug\netcoreapp3.0 The following generates the corresponding class

You need to double-click our project to edit csproj file , Put the new UpImg.proto Add to the configuration

Add it to the configuration and save it in obj\Debug\netcoreapp3.0 The corresponding class can be generated in

Then continue to implement UpImg.proto, The implementation is very simple. Just pay attention to the parameters and return values

client

The client needs to add a package ：Grpc.Net.Client、Google.Protobuf、Grpc.Tools

  <ItemGroup>
    <PackageReference Include="Google.Protobuf" Version="3.11.2" />
    <PackageReference Include="Grpc.Net.Client" Version="2.26.0" />
    <PackageReference Include="Grpc.Tools" Version="2.26.0">
      <PrivateAssets>all</PrivateAssets>
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
    </PackageReference>
  </ItemGroup>

hold UpImg.proto Copy to... In the client Proto（ Here we use direct copy ）

Also add configuration on the client , Adding configuration and client will automatically generate corresponding code

And then call it :

public async void UpLoad()
{
    
    // Settings allow unsafe HTTP2 Support 
    AppContext.SetSwitch("System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
    var channel = GrpcChannel.ForAddress("http://localhost:50001");
    var client = new UpImg.UpImgClient(channel);
    var reply = await client.DoUpLoadAsync(new UpImgRequest {
     Img = "hello girl" });
    Console.WriteLine(reply.Message);
}

gRPC The call was actively rejected by the target computer , Unable to connect .
Modify port settings , May be https Caused by the

Code ：

public static IHostBuilder CreateHostBuilder(string[] args) =>
    Host.CreateDefaultBuilder(args)
        .ConfigureWebHostDefaults(webBuilder =>
        {
    
            webBuilder.ConfigureKestrel(options => {
    

                options.ListenLocalhost(8099,a=>a.Protocols= Microsoft.AspNetCore.Server.Kestrel.Core.HttpProtocols.Http2);
            });

            webBuilder.UseStartup<Startup>();
        });

There is also the possibility of error Grpc.Core.RpcException:“Status(StatusCode=Unimplemented, Detail="Service is unimplemented.")”
Think you haven't started the service you called yet