Aap.net core 中间件为什么不能使用 services.AddScoped 注册的services ?
0
悬赏园豆：10
[已关闭问题]
关闭于 2017-11-28 02:03
直接上代码吧
public void ConfigureServices(IServiceCollection services)
{
services.AddScoped<IOperationScoped, Operation>();
}
private readonly RequestDelegate _next;
private readonly IOperationScoped _scopedOperation;
public ServiceLifetimesMiddleware(RequestDelegate next,
IOperationScoped scopedOperation)
{
_next = next;
_scopedOperation = scopedOperation;
}
public async Task Invoke(HttpContext context)
{
await context.Response.WriteAsync($"Scoped:{_scopedOperation.OperationId}\r\n");
}
在中间件中报错：System.InvalidOperationException: Cannot resolve scoped service 'IOperationScoped' from root provider.
为什么在 mvc 下可以使用， mvc不也是个中间件吗？
所有回答(1)
0
将 IOperationScoped scopedOperation 写到 Invoke(HttpContext context) 参数里面
