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网站制作知名乐云践新专家,百度上的广告多少钱一个月,制作动态网站教程,wordpress电视主题下载一、双向流处理概述简单来讲客户端可以向服务端发送消息流，服务端也可以向客户端传输响应流，即客户端和服务端可以互相通讯客户端无需发送消息即可开始双向流式处理调用。客户端可选择使用 RequestStream.WriteAsync 发送消息。使用 ResponseStream…

一、双向流处理概述

简单来讲客户端可以向服务端发送消息流，服务端也可以向客户端传输响应流，即客户端和服务端可以互相通讯
客户端无需发送消息即可开始双向流式处理调用。客户端可选择使用 RequestStream.WriteAsync 发送消息。使用 ResponseStream.MoveNext() 或 ResponseStream.ReadAllAsync() 可访问从服务流式处理的消息。ResponseStream 没有更多消息时，双向流式处理调用完成。

二、案例简介

客户端发送请求流通过equestStream.WriteAsync传入到服务端
服务端响应到客户端的流通过ResponseStream.WriteAsync写入到客户端
服务端使用System.Threading.Channels保证线程安全交互

三、服务端配置（注意：grpc相关配置参考我之前的文章）

配置.proto文件

// 1.提供公共的实体proto文件
// 2.服务引用对应的proto文件
// 3.定义三个客户流方法//定义messages.proto文件令需要注意项目文件中的特性GrpcServices=None；syntax = "proto3";option csharp_namespace = "GrpcProject";package grpc.serviceing;// 消息推送/接收实体
message ExampleMessage
{string msg = 1;
}// 双向流文件twowaystream.protosyntax = "proto3";import "Protos/messages.proto";option csharp_namespace = "GrpcProject";package grpc.serviceing;service BothWaysRpc{// 双向流rpc StreamingBothWays(stream ExampleMessage) returns (stream ExampleMessage);
}

1 服务接口实现

    /// <summary>/// 双向流服务/// </summary>public class BothWaysService : BothWaysRpc.BothWaysRpcBase{/// <summary>/// 自动重置事件/// </summary>private readonly ManualResetEventSlim _event;public BothWaysService(){_event = new ManualResetEventSlim(false);}public override async Task StreamingBothWays(IAsyncStreamReader<ExampleMessage> requestStream,IServerStreamWriter<ExampleMessage> responseStream,ServerCallContext context){// 创建线程安全的有限容量通道var channel = Channel.CreateBounded<ExampleMessage>(new BoundedChannelOptions(capacity: 5));var task = Task.Run(async () =>{await foreach (var message in requestStream.ReadAllAsync()){// 读取消息 写入通道if (!string.IsNullOrWhiteSpace(message.Msg)){await Console.Out.WriteLineAsync($"记录客户端传入消息：{message.Msg}");// todo 消息处理await channel.Writer.WriteAsync(message, context.CancellationToken);}}}, context.CancellationToken);await foreach (var message in channel.Reader.ReadAllAsync()){// 打印通道接收的消息await Console.Out.WriteLineAsync($"通道传入消息：{message.Msg}");// 写入响应流ExampleMessage exampleMessage = new ExampleMessage() { Msg = $"我已经接收到消息：{message.Msg}" };await responseStream.WriteAsync(exampleMessage);if (message.Msg.ToLower() == "exit"){break;}}// 完结写入通道channel.Writer.Complete();await task;}}

2 Program注入

    public class Program{public static void Main(string[] args){var builder = WebApplication.CreateBuilder(args);builder.Services.AddGrpc();var app = builder.Build();// 一元方法//app.MapGrpcService<DollarService>();// 客户端流//app.MapGrpcService<ClientStreamService>();// 服务端流//app.MapGrpcService<ServerStreamService>();// 双向流app.MapGrpcService<BothWaysService>();app.Run();}}

四、客户端配置

引用proto文件，配置为客户端类型
根据编译生成的函数进行传参调用
创建WPF测试客户端

button按钮触发grpc

    /// <summary>/// BothWaysClient.xaml 的交互逻辑/// </summary>public partial class BothWaysClient : Window{public BothWaysClient(){InitializeComponent();}private async void Excute_Click(object sender, RoutedEventArgs e){Action<string> action = str => { txtValue.Text += $"{str}\r\n"; };await WpfClient.Show(action);txtValue.Text += "\r\n\r\n";}}

grpc客户端接口调用

        /// <summary>/// 双向流/// </summary>/// <param name="action"></param>/// <returns></returns>public static async Task Show(Action<string> action){var messages = new List<string>(){"test","one","two","three","false","four","Oooo","dddd","vvvfff","exit"};Random rnd = new Random(20);var channel = GrpcChannel.ForAddress("https://localhost:7188");var client = new GrpcProject.BothWaysRpc.BothWaysRpcClient(channel);var bothWays = client.StreamingBothWays();var requestTask = Task.Run(async () =>{while (true){var index = rnd.Next(messages.Count);var msg = messages[index];await bothWays.RequestStream.WriteAsync(new ExampleMessage { Msg = msg });if (msg == "exit"){break;}}});await foreach (var item in bothWays.ResponseStream.ReadAllAsync()){action(item.Msg);if (item.Msg == "我已经接收到消息：exit"){break;}}await requestTask;}