Question

在这个例子中，我有一个MainPage和两个UserControls

MainPage - Page
Content - UC
ButtonPanel - UC

在我的ButtonPanel中，我有一个从数据库中删除项目的按钮，之后我希望更新Content以显示更新的内容。为此，我使用以下代码：

MainPage Xaml：

<UC:Content x:Name="Content" />
<Panels:ButtonPanel x:Name="ButtonPanel" />

MainPage Codebehind：

ButtonPanel.DeleteItem += new EventHandler(UpdateContent);

private void UpdateContent(object sender, EventArgs e)
{
    // If i start a stopwatch here and stop it in Content.Refresh()
    // It shows that it took 3000 miliseconds to go from this method
    // Into the Content.Refresh method, without executing any code.
    Content.Refresh();
    OnPropertyChanged("Content");
}

内容UC Codebehind：

public void Refresh()
{
    // Update content
    // StopWatch shows that running all of this code takes 20 miliseconds.
}

ButtonPanel UC Codebehind：

private static EventHandler _deleteItem;
public static event EventHandler DeleteItem
{
    add
    {
        if (_deleteItem == null)
        {
            _deleteItem += value;
        }
    }
    remove
    {
        _deleteItem -= value;
    }
}

private void ButtonDelete_Tapped(object sender, TappedRoutedEventArgs e)
{
    // This takes no time at all either.
    // Delete items from database
    if (_buttonRefreshEvent != null)
        _buttonRefreshEvent(this, EventArgs.Empty);
}

基本上，秒表告诉我的是从MainPage进入Content.Refresh()需要3000毫秒。为什么这样，我能做些什么来减少这种负载速度，因为它非常令人沮丧。

UserControls之间的事件调用非常缓慢

0 个答案: