[英]Per-request scope with ASP.NET 5 and built-in DI container
I'm investigating the topic of DI in ASP.NET 5, and I faced such a problem - I don't understand how to create a new instance of a service per request. 我正在调查ASP.NET 5中的DI主题,我遇到了这样的问题 - 我不明白如何为每个请求创建一个新的服务实例。
I use the code: 我用的代码是:
services.AddScoped<ValueStore>();
And inside my middlewares I grab the value: 在我的中间件中,我抓住了价值:
var someValueStore = app.ApplicationServices.GetService<ValueStore>();
Full code is available here 完整代码可在此处获得
And my problem is: while I expect this service to be renewed on each request, it doesn't happen, and it behaves as if it was registered as AddSingleton()
. 我的问题是:虽然我希望在每个请求上更新此服务,但它不会发生,并且它的行为就像注册为AddSingleton()
。
Am I doing anything wrong? 我做错了吗?
app.ApplicationServices
does not provide a request-scoped IServiceProvider
. app.ApplicationServices
不提供请求范围的IServiceProvider
。 It will return a singleton instance of ValueStore
when you use GetService<>()
. 当您使用GetService<>()
时,它将返回ValueStore
的单例实例。 You have two options here: 你有两个选择:
Use HttpContext.RequestServices
: 使用HttpContext.RequestServices
:
var someValueStore = context.RequestServices.GetService<ValueStore>();
Or inject ValueStore
in the Invoke
method of a middleware: 或者在中间件的Invoke
方法中注入ValueStore
:
public async Task Invoke(HttpContext httpContext, ValueStore valueStore)
{
await httpContext.Response.WriteAsync($"Random value = {valueStore.SomeValue}");
await _next(httpContext);
}
I cloned your repo and this works. 我克隆了你的回购,这很有效。
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