英文:
Hub signalr not found in Maui library class
问题
I've just created a new MAUI library project and added a package from NuGet, Microsoft.AspNetCore.SignalR.Client. Nevertheless, at the class level, the Hub cannot be found, and I am getting the error:
The type or namespace Hub could not be found.
It's strange because in another project like Blazor App, there is no issue at all when doing the same. Any thoughts?
Full code:
using System;
using Microsoft.AspNetCore.SignalR;
namespace ServicesMauiLib
{
public class ChatHub : Hub
{
public Task SendMessage(string user, string message)
{
return Clients.All.SendAsync("ReceiveMessage", user, message);
}
}
}
英文:
I've just created new MAUI library project and added package from nuget Microsoft.AspNetCore.SignalR.Client nevertheless on class level Hub is not found and i am getting error:
The type or namespace Hub could not be found.
Strange as in other project like Blazor App there is no issue at all doing the same. Any thoughts?
Full code:
using System;
using Microsoft.AspNetCore.SignalR;
namespace ServicesMauiLib
{
public class ChatHub : Hub
{
public Task SendMessage(string user, string message)
{
return Clients.All.SendAsync("ReceiveMessage", user, message);
}
}
}
答案1
得分: 2
SignalR的Hub是用于服务器应用程序的内容，因此将其包含在Microsoft.AspNetCore.SignalR.Client包中没有意义。
Hub类曾包含在核心的Microsoft.AspNetCore.SignalR中，但现在已被弃用。
> 在3.1中，我们转向了“共享框架”的概念。这样做可以使我们不必发布之前发布的许多包，它们现在在构建ASP.NET Core应用程序时默认包含在内。这就是发生在SignalR服务器包上的情况，它们现在包含在共享框架中，我们不再发布独立包。
>
> 另一个常见的问题是“如何编写一个用于服务器应用程序的使用SignalR的库？”。这可以通过在库中添加对共享框架的引用来完成。有关详细信息，请参阅https://docs.microsoft.com/aspnet/core/fundamentals/target-aspnetcore?view=aspnetcore-6.0&tabs=visual-studio。
因此，基本上需要将以下内容添加到库的.csproj文件中。
<ItemGroup>
<FrameworkReference Include="Microsoft.AspNetCore.App" />
</ItemGroup>
英文:
SignalR Hub is something that you use on a server application so it doesn't make sense to be included in Microsoft.AspNetCore.SignalR.Client package.
The Hub class was included in the core Microsoft.AspNetCore.SignalR which is now deprecated.
> In 3.1 we moved to the "shared framework" concept. This made it so we
> don't need to release a lot of the packages that were released before
> and they are now included by default when you build an ASP.NET Core
> application. This is what happened to the SignalR server packages,
> they are now included in the shared framework and we no longer produce
> a standalone package.
>
> Another common question is "how do I write a library for server
> applications that uses SignalR?". This can be done by adding a
> reference to the shared framework in your library. See
> https://docs.microsoft.com/aspnet/core/fundamentals/target-aspnetcore?view=aspnetcore-6.0&tabs=visual-studio
> for details.
So basically you need to add the following to the .csproj file of your library.
<ItemGroup>
<FrameworkReference Include="Microsoft.AspNetCore.App" />
</ItemGroup>
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