问题描述
我正在尝试使用xamarin表单和signalR内核构建聊天应用程序，但遇到一个奇怪的问题-我能够将IOS设备中的消息发送到android设备，但是我无法从中发送消息将Android设备转换为IOS设备。
这是我的客户信号R连接代码
{
if (hubConnection != null && hubConnection.State == HubConnectionState.Connected)
return hubConnection;
else
{
try
{
hubConnection = new HubConnectionBuilder()
//.WithUrl($"https://{ip}:5050/chatHub")
.WithUrl(Constants.UriHostNameType + "chatHub")
.ConfigureLogging(logging =>
{
logging.AddDebug();
logging.SetMinimumLevel(LogLevel.Trace);
}).WithAutomaticReconnect()
.Build();
HubConnectionExtensions.On<String,String>(hubConnection,RPCName,(user,message) => OnFunction(user,message));
await Connect();
}
catch(Exception ex)
{
Debug.WriteLine(ex.Message);
}
return hubConnection;
}
}
这是我的客户服务员
{
try{
var messageObj = JsonConvert.DeserializeObject<Message>(message);
var connection = DependencyService.Get<IsqliteDb>().GetConnection();
connection.InsertAsync(messageObj);
messageRecievedEvent?.BeginInvoke(messageObj,null,null);
} catch(Exception e)
{
Debug.WriteLine(e.Message);
}
}
这是我从Android手机发送消息时在客户端捕获的Signalr跟踪
Microsoft.AspNetCore.Http.Connections.Client.Internal.ServerSentEventsTransport: Debug: Received 21 bytes. Parsing SSE frame.
Microsoft.AspNetCore.Http.Connections.Client.Internal.ServerSentEventsTransport: Debug: Passing message to application. Payload size: 11.
Microsoft.AspNetCore.SignalR.Client.HubConnection: Debug: Processing 11 byte message from server.
Microsoft.AspNetCore.SignalR.Client.HubConnection: Trace: Resetting keep-alive timer,received a message from the server.
Microsoft.AspNetCore.SignalR.Client.HubConnection: Trace: Received a ping message.
Microsoft.AspNetCore.SignalR.Client.HubConnection: Trace: Acquired the Connection Lock in order to ping the server.
Microsoft.AspNetCore.SignalR.Client.HubConnection: Debug: Sending PingMessage message.
Microsoft.AspNetCore.SignalR.Client.HubConnection: Debug: Sending PingMessage message completed.
Microsoft.AspNetCore.Http.Connections.Client.Internal.ServerSentEventsTransport: Debug: Sending 11 bytes to the server using url: XXXXXXXXXXX.
Microsoft.AspNetCore.SignalR.Client.HubConnection: Trace: Releasing Connection Lock in RunTimerActions (/_/src/SignalR/clients/csharp/Client.Core/src/HubConnection.cs:1817).
Microsoft.AspNetCore.Http.Connections.Client.Internal.LoggingHttpMessageHandler: Trace: Sending HTTP request POST 'XXXXXXXX'.
Microsoft.AspNetCore.Http.Connections.Client.Internal.ServerSentEventsTransport: Debug: Message(s) sent successfully.
这是我的服务器中心代码
public async Task SendMessage(string userEmail,string message,string targetUserToken)
{
var messageObj = JsonConvert.DeserializeObject<Message>(message);
try
{
await Clients.Group(userEmail).SendAsync("IncomingMessage",userEmail,message);
}
catch (Exception e)
{
}
finally
{
await _notificationService.SendNotificationToUserUsingToken(targetUserToken,messageObj.Text,"New Message from " + messageObj.UIName,5,message);
await InserIntoDb(messageObj);
}
}
public async Task InserIntoDb(Message obj)
{
using (var context = CoachingContext.GetRawContext(configuration))
{
context.messages.Add(obj);
await context.SaveChangesAsync();
}
}
public async Task LogInUser(string email)
{
await Groups.AddToGroupAsync(Context.ConnectionId,email);
}
public async Task RemoveFromGroup(string email)
{
await Groups.RemoveFromGroupAsync(Context.ConnectionId,email);
}
解决方法
您可以在符合{strong> App Transport Security in Xamarin.iOS 的情况下使用Constants.UriHostNameType进行支票。
（可选）您可以对应用程序的Info.plist文件进行以下更改，以完全禁用所有域和Internet通信的ATS：
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>
在升级到iOS 14之后，我遇到了同样的问题。检查SignalR nuget的版本，然后尝试将所有项目升级到初步版本5.0 rc。