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我有一个当前使用 ASP.Net SignalR 的 .Net Framework Web 应用程序（v 4.6.1）。我正在尝试添加另一个 SignalR 集线器，但允许此集线器使用Azure SignalR 服务进行连接，以便我们可以使用 REST API 向最终用户发送单向消息。

我一直在这里和这里遵循这些示例来实现该功能。

有3个基本部分

  • 连接到集线器（半工作）
  • 通过 REST API 发送消息（成功运行）
  • 作为最终用户接收消息（不起作用）

Hub 和 Azure SignalR Service 已创建，简单，无需展示。

代码示例

.Net Framework Web App Startup.cs中的集线器连接

app.MapAzureSignalR(GetType().FullName, new HubConfiguration { EnableDetailedErrors = true },
    options =>
    {
        options.ConnectionString =
                    ConfigurationManager.ConnectionStrings["AzureSignalR"].ConnectionString;
    });

MapAzureSignalR来自这个 nuget 包

我还有客户端 JavaScript 来处理集线器连接和事件，这已经使用标准 ASP.Net SignalR 运行了几个月。

客户端连接记录以下信息：

Error: You are using a version of the client that isn't compatible with the server. Client version 1.5, server version 2.0.
at Object.error (jquery.signalR.js:179)
at Object.success (jquery.signalR.js:728)
at i (scripts.bundle.js:2)
at Object.fireWith [as resolveWith] (scripts.bundle.js:2)
at A (scripts.bundle.js:4)
at XMLHttpRequest.<anonymous> (scripts.bundle.js:4)
at XMLHttpRequest.wrapFn (zone.js:1166)
at ZoneDelegate.invokeTask (zone.js:421)
at Zone.runTask (zone.js:188)
at ZoneTask.invokeTask [as invoke] (zone.js:496)

Web App 有以下包：

  <package id="Microsoft.AspNet.SignalR" version="2.4.0" targetFramework="net461" />
  <package id="Microsoft.AspNet.SignalR.Core" version="2.4.0" targetFramework="net461" />
  <package id="Microsoft.AspNet.SignalR.JS" version="2.4.0" targetFramework="net461" />
  <package id="Microsoft.AspNet.SignalR.SqlServer" version="2.2.2" targetFramework="net45" />
  <package id="Microsoft.AspNet.SignalR.SystemWeb" version="2.4.0" targetFramework="net461" />
  <package id="Microsoft.AspNet.WebApi.Client" version="5.2.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.WebApi.Core" version="5.2.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.WebApi.Owin" version="5.2.3" targetFramework="net45" />
  <package id="Microsoft.AspNet.WebApi.WebHost" version="5.2.3" targetFramework="net45" />
  <package id="Microsoft.AspNetCore.Authentication.Abstractions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Authorization" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Authorization.Policy" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Connections.Abstractions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Hosting.Abstractions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Hosting.Server.Abstractions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Http" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Http.Abstractions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Http.Connections" version="1.0.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Http.Connections.Client" version="1.0.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Http.Connections.Common" version="1.0.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Http.Extensions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Http.Features" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Routing" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.Routing.Abstractions" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.SignalR" version="1.0.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.SignalR.Common" version="1.0.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.SignalR.Core" version="1.0.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.SignalR.Protocols.Json" version="1.0.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.WebSockets" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.AspNetCore.WebUtilities" version="2.1.0" targetFramework="net461" />
  <package id="Microsoft.Azure.SignalR" version="1.0.6" targetFramework="net461" />
  <package id="Microsoft.Azure.SignalR.AspNet" version="1.0.0-preview1-10317" targetFramework="net461" />
  <package id="Microsoft.Azure.SignalR.Protocols" version="1.0.6" targetFramework="net461" />

.Net Framework 控制台应用程序中的集线器连接

var serviceUtils = new ServiceUtils(ConfigurationManager.ConnectionStrings["Azure:SignalR:ConnectionString"].ConnectionString);

var url = GetClientUrl(serviceUtils.Endpoint);

_connection = new HubConnection(url)
{
    ConnectionToken = serviceUtils.GenerateAccessToken(url, userId)
};

IHubProxy proxy = _connection.CreateHubProxy(hubName);

proxy.On("broadcastMessage", (string server, string message) =>
{
    Console.WriteLine($"[{DateTime.Now.ToString()}] Received message from server {server}: {message}");
});


_connection.Start();

记录连接状态时，它显示Disconnected, Connecting, Disconnected。

.Net 核心代码示例

var serviceUtils = new ServiceUtils(connectionString);

var url = GetClientUrl(serviceUtils.Endpoint);

_connection = new HubConnectionBuilder()
    .WithUrl(url, options =>
    {
        options.AccessTokenProvider = () =>
            {
                return Task.FromResult(serviceUtils.GenerateAccessToken(url, userId));
            };
    }).Build();

_connection.On("broadcastMessage", (string server, string message) =>
{
    Console.WriteLine($"[{DateTime.Now.ToString()}] Received message from server {server}: {message}");
});

await _connection.StartAsync(CancellationToken.None);

这成功连接并从我的 REST API 广播中接收到消息（见下文）

REST API 广播

var url = $"{authenticationUtility.Endpoint}/api/v1/hubs/{hubName.ToLower()}";
var request = new HttpRequestMessage
{
    Method = HttpMethod.Post,
    RequestUri = new Uri(url)
};

request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", authenticationUtility.GenerateAccessToken(url, sender));
request.Headers.Accept.Clear();
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
request.Headers.AcceptCharset.Clear();
request.Headers.AcceptCharset.Add(new StringWithQualityHeaderValue("UTF-8"));

var content = JsonConvert.SerializeObject(new MessageContent{ Target = "broadcastMessage", Arguments = new []{ sender, message}});
request.Content = new StringContent(content, Encoding.UTF8, "application/json");
var response = await httpClient.SendAsync(request);

这会返回202 Accepted我期望的代码并将消息发送到 .Net Core 控制台应用程序。

在我的 Azure 门户上，我可以看到连接，但我无法在我的 Web 应用程序的集线器连接中接收消息

4

1 回答 1

1

我最终通过创建一个 .Net Core Web 应用程序来解决这个问题，该应用程序只管理 Hub，然后使用（现已弃用）@aspnet/signalr npm 包连接到它。这个包现在已经被@microsoft/signalr包取代了

于 2021-11-19T19:31:25.010 回答