Question

我正在尝试在单独的线程中加载数据库上下文。然后在完成后更新表单的显示。

有没有人可以告诉我正确的做法。

目前我的上下文已加载，但我的_context似乎没有返回Context：

    public static ProjectEntities Context = new ProjectEntities();

    public static void LoadAsync(ref ProjectEntities _context, Type _table)
    {
        LoadAsyncImpl(_table);
        _context = Context;
    }

    private static async void LoadAsyncImpl(Type _table)
    {
        ProjectEntities _context = new ProjectEntities();
        await _context.Set(_table).LoadAsync();
        Context = _context;

    }
}

Answer 1

假设你正在使用WinForms，你可能会尝试这样的事情。请注意，_context不再是静态的。

private ProjectEntities _context;

public MainForm()
{
    InitializeComponent();
}

private async void MainForm_Loaded(object sender, EventArgs e)
{
    await LoadAsync()
        .ContinueWith(x => {
            if (!x.IsFaulted)
            {
                _context = x.Result;
                Text = "Loaded";
                /* any other stuff on the main UI thread after loading */
            }
            else
            {
                /* and don't forget that sometimes things fail */
            }
        }, TaskScheduler.FromCurrentSynchronizationContext());
}

private async Task<ProjectEntities> LoadAsync()
{
    var context = new ProjectEntities();
    await context.Set(...).LoadAsync();
    return context;
}

C＃异步传递给其他线程的引用

1 个答案: