最近使用一个封装了TreeView的自定义控件,使用时绑定了TreeView的SelectedItemChanged事件,发现点击某一节点,会多次触发SelectedItemChanged事件,第二层节点触发两次,第三层节点触发三次。
简单排除后发现是TreeView自身控件的问题。
原本多次触发的代码如下
//委托
public delegate void SelectedItemChangedEvent(object selectedItem);
//事件
public event SelectedItemChangedEvent SelectedItemChanged;
//TreeView原生事件
private void treeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
try
{
object selectedObj = this.treeView.SelectedItem;
if (SelectedItemChanged != null)
{
//此处触发自定义绑定事件
SelectedItemChanged.Invoke(selectedObj);
}
}
catch (Exception ex)
{
LogService.WriteExceptionLog(ex, "");
ControlUtility.ShowInfomationMsgbox(ex.Message);
}
}
经查阅资料,使用以下方法可以避免多次触发事件。
private void treeView_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
{
try
{
object selectedObj = this.treeView.SelectedItem;
if (SelectedItemChanged != null)
{
//SelectedItemChanged.Invoke(selectedObj);
Dispatcher.BeginInvoke(DispatcherPriority.Background, SelectedItemChanged, selectedObj);
}
}
catch (Exception ex)
{
LogService.WriteExceptionLog(ex, "");
ControlUtility.ShowInfomationMsgbox(ex.Message);
}
}
参考资料:https://www.codeproject.com/Tips/208896/WPF-TreeView-SelectedItemChanged-called-twice
可能需要翻墙