问题描述
限时送ChatGPT账号..我正在研究 WPF,我正在创建一个 userControl,其中包含一个具有一些 TabItems 的 TabControl.
I am working on WPF and I am creating a userControl which contains a TabControl which has some TabItems.
我需要在选定的选项卡更改时执行一些东西,所以,我尝试做的是使用事件 mytabcontrol.selectionChanged
,但它是多次提出的,即使我只点击一次一个选项卡.然后我读了这篇文章 is-there-selected-tab-changed-event-in-the-standard-wpf-tab-control 并将此代码放入我的方法中:
I need to execute some stuff when the selected tab changes, so, what I tried to do is to use the event myTabControl.SelectionChanged
but it was raised many times, even though I only clicked once a TabItem. Then I read this post is-there-selected-tab-changed-event-in-the-standard-wpf-tab-control and put this code inside my method:
void mainTabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (e.Source is TabControl)
{
//do work when tab is changed
}
}
这样做后,第一个问题已经解决,但是当我运行应用程序并尝试更改选项卡时,出现错误:
After doing that the first problem had been solved, but then when I ran the application and tried to change of tab, an error was raised:
Dispatcher processing has been suspended, but messages are still being processed
Visual Studio 指向 if (e.Source is TabControl) {//here }
Visual Studio points to the first line of code inside of if (e.Source is TabControl) { //here }
但我发现这篇文章selectionchanged-event-firing-exceptions-for-未知原因,我可以写一些代码来解决这个问题,如下所示:
But I found this article selectionchanged-event-firing-exceptions-for-unknown-reasons and I could solve that problem writing some code as below:
void mainTabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (e.Source is TabControl)
{
if (this.IsLoaded)
{
//do work when tab is changed
}
}
}
但是现在我遇到了另一个我无法解决的问题:
But right now I am having another problem which I havent been able to solve:
事件触发了两次!另一个奇怪的事情是,只有当我第一次尝试更改所选标签时,事件才会引发两次,但所选标签仍然相同
希望有人能帮助我,在此先感谢您.
I hope someone can help me, thank you in advance.
推荐答案
我觉得我需要休息一下,因为我的问题真的很傻:
I think I need to take a rest, since my problem is really silly:
事实证明,我应该使用 TabItem
而不是 TabControl
,因为它是我感兴趣的控件.
Turns out that instead of TabControl
I should have used TabItem
since it is the control I am interesting in.
所以,我的代码必须如下:
So, my code has to be as below:
void mainTabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (e.Source is TabItem)
{
if (this.IsLoaded)
{
//do work when tab is changed
}
}
}
这篇关于TabControl 的 SelectionChanged 事件问题的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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