asp.net核心DI只注入单例,范围和瞬态不工作

中间件只实例化一次,因此它是一个有效的单例.

因此,您注入到Middlewares构造函数中的所有内容都将从单例容器(您可以通过app.ApplicationServicesConfigure方法内部访问的容器)中解析出来.

我看到你IAccountService被注入中间件,所以这似乎导致了这个问题.您必须使用在Invoke方法中基于每个上下文解析它

public Task Invoke(HttpContext context, IAccountService accountService)
{
    // If the request path doesn't match, skip
    if (!context.Request.Path.Equals(_options.Path, StringComparison.Ordinal))
    {
        return _next(context);
    }

    if (!context.Request.Method.Equals("POST")
       || !context.Request.ContentType.Contains("application/json"))
    {
        context.Response.StatusCode = 400;
        return context.Response.WriteAsync("Bad request.");
    }

    return GenerateToken(context, accountService);
}

要么

public Task Invoke(HttpContext context)
{
    var accountService = context.RequestServices.GetRequiredService();

    // If the request path doesn't match, skip
    if (!context.Request.Path.Equals(_options.Path, StringComparison.Ordinal))
    {
        return _next(context);
    }

    if (!context.Request.Method.Equals("POST")
       || !context.Request.ContentType.Contains("application/json"))
    {
        context.Response.StatusCode = 400;
        return context.Response.WriteAsync("Bad request.");
    }

    return GenerateToken(context, accountService);
}