我在创建WebSocketManager Extensions时遇到错误:
System.InvalidOperationException
A suitable constructor for type
'CustomerManagementCore.WebSocketManager.WebSocketManagerMiddleware' could not be located. Ensure the type is concrete and services are registered for all parameters of a public constructor.
MapWebSocketManager
方法:
public static IApplicationBuilder MapWebSocketManager(this IApplicationBuilder app,
PathString path,
WebSocketHandler handler)
{
return app.Map(path, (_app) => _app.UseMiddleware<WebSocketManagerMiddleware>(handler));
}
WebSocketManagerMiddleware
构造函数:
public WebSocketManagerMiddleware(RequestDelegate next,
WebSocketHandler webSocketHandler)
{
_next = next;
_webSocketHandler = webSocketHandler;
}
我知道我的WebSocketManagerMiddleware
构造函数是否有错误,但我不知道。谁知道?
谢谢。
从错误中我猜想WebSocketHandler
没有添加到你的启动类中的IServicesCollection
。将它添加到服务集合后,应该能够按预期注入它。通常,这是在ConfigureServices
方法中为从默认模板创建的ASP.NET Core应用程序完成的。