C# 将wait与实现CancelEventArgs的事件一起使用

我有一个与此类似的基类：

public abstract class PageBase
{
    public PageBase() { }

    public Task<object> Refresh(ModelRequirements requirements)
    {
        // does work of talking to server and getting data
    }

    private DataStates _dataState;
    public DataStates DataState()
    {
        get { _dataState = value; }

        set
        {
            var e = new DataStateChangingEventArgs();

            // the following method raises the changing event.
            // it does not return a task, and cannot be awaited.
            OnDataStateChanging(e);

            if (e.Cancel)
                return;

            _dataState = value;
        }
    }

    public event EventHandler<DataStateChangingEventArgs> DataStateChanging;
    protected virtual void OnDataStateChanging(DataStateChangingEventArgs e)
    {
        var dataStateChanging = DataStateChanging;
        if (DataStateChanging != null)
            DataStateChanging(this, e);
    }
}

---

等待刷新（在OnDataStateChanging覆盖内）是一个问题，因为它返回。在不执行OnDataStateChanging返回任务的情况下，是否有此模式的解决方案？

有一种期望，即属性设置程序将实际设置该属性，并在设置程序返回之前设置该属性。违反这一预期将导致混乱

这种模式有解决方案吗

我建议您将属性更改为getter，并使用一种方法来处理该集：

public DataStates DataState { get; private set; }

public Task UpdateDataStateAsync()
{
   // ... Use await as necessary

这将使您的API与内部实际发生的情况相匹配，并且更易于理解

public DataStates DataState { get; private set; }

public Task UpdateDataStateAsync()
{
   // ... Use await as necessary