小编zhi*_*iyw的帖子

在asp.netcore web api项目中，有一个名为TimedHostedService的后台服务，通过AddSingleton<>注入，当从控制器访问该服务的成员[ ExecutionCount ]时，该值始终等于0，当设置成员[ ExecutionCount ]时改为static，值就变了，不知道为什么？属性 [ ExecutionCount ] 必须是静态的吗？

定时托管服务：

public class TimedHostedService : IHostedService, IDisposable\n{\n    private int executionCount = 0;\n    private readonly ILogger<TimedHostedService> _logger;\n    private Timer _timer;\n\n    public int ExecutionCount\n    {\n        get { return executionCount; }\n        set { executionCount = value; }\n    }\n\n    public TimedHostedService(ILogger<TimedHostedService> logger)\n    {\n        _logger = logger;\n    }\n\n    public Task StartAsync(CancellationToken stoppingToken)\n    {\n        _logger.LogInformation("Timed Hosted Service running.");\n\n        _timer = new Timer(DoWork, null, TimeSpan.Zero,\n            TimeSpan.FromSeconds(1));\n\n        return Task.CompletedTask;\n    }\n\n    private void DoWork(object state)\n    {\n …