IOptionsMonitor与IOptionsSnapshot的区别

public class MyMiddleware
{
    private readonly RequestDelegate _next;
    private readonly IOptionsSnapshot<MyOptions> _optionsSnapshot;

    public MyMiddleware(RequestDelegate next, IOptionsSnapshot<MyOptions> optionsSnapshot)
    {
        _next = next;
        _optionsSnapshot = optionsSnapshot;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        var options = _optionsSnapshot.Value;
        // 使用 options 进行操作
        await _next(context);
    }
}

public class MyOptionsMonitor : IOptionsMonitor<MyOptions>
{
    private readonly IOptionsMonitorCache<MyOptions> _cache;
    private readonly IConfiguration _configuration;

    public MyOptionsMonitor(IOptionsMonitorCache<MyOptions> cache, IConfiguration configuration)
    {
        _cache = cache;
        _configuration = configuration;
    }

    public MyOptions GetCurrentValue(string name)
    {
        return _cache.GetCurrentValue(name, () => _configuration.GetSection(name).Get<MyOptions>());
    }

    public IDisposable OnChange(string name, Action<MyOptions, string> callback)
    {
        return _cache.OnChange(name, () => _configuration.GetSection(name).Get<MyOptions>(), callback);
    }
}