异常 集中异步处理

public class DataStorage
{
    public async Task WriteFile(string key, object value)
    {
        try 
        {
            var jsonValue = JsonConvert.SerializeObject(value);
            using (var file = await folder.OpenStreamForWriteAsync(key, CreationCollisionOption.ReplaceExisting))
            using (var stream = new StreamWriter(file))
                await stream.WriteAsync(jsonValue);
        }
        catch (Exception exception)
        {
            AsyncErrorHandler.HandleException(exception);
        } 
    }
}

public static class AsyncErrorHandler
{
    public static void HandleException(Exception exception)
    {
        Debug.WriteLine(exception);
    }
}

 https://github.com/Fody/AsyncErrorHandler/blob/master/README.md