2

像这样创建 WebSocketManagerExtensions 时出现错误:

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;
}

我知道我的构造函数是否有错误WebSocketManagerMiddleware,但我不知道。有人知道吗?

谢谢。

4

1 回答 1

5

从错误中我猜想WebSocketHandler没有添加到IServicesCollection您的启动类中。将其添加到服务集合后,它应该能够按预期注入。通常,这是在ConfigureServices从默认模板创建的 ASP.NET Core 应用程序的方法中完成的。

于 2017-03-24T06:55:40.427 回答