WPF TabControl On SelectionChanged，将焦点设置到文本字段

问题描述

我有一个选项卡控件和一些选项卡项.我正在成功监听 SelectionChanged 事件，并检查我感兴趣的选项卡是否是当前选定的选项卡.

I have a tab control, and a few tab items. I am successfully listening to the SelectionChanged event, and checking if the tab I'm interested in is the currently selected one.

我正在使用这段代码(如下)，并逐步通过调试器，我可以看到我的分支逻辑按设计工作；但是，我遇到的问题是某些东西覆盖了对 txt.Focus() 的调用，因为在显示正确的选项卡项后，焦点不在文本框上.

I'm using this code (below), and stepping through the debugger, I can see that my branching logic works as designed; however, the issue I'm having is that something is overriding this call to txt.Focus() because after the correct tab item is displayed, the focus is not on the text box.

private void tabMain_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    // exact same behavior with and without this line
    e.Handled = true;

    if (e.AddedItems.Contains(usrTab))
    {
        txtusr.Focus();
    }
    else if (e.AddedItems.Contains(svcTab))
    {
        txtsvc.Focus();
    }
}

如果我只是将 txtusr.Focus() 放在按钮事件处理程序中，它会完全按照我的预期聚焦.

If I just put txtusr.Focus() in a button event handler, it focuses exactly as I'd expect.

我怀疑这与调用 .Focus() 方法时未加载 tabitem 内容有关，但我不确定如何修复它.

I suspect that this has to do with the tabitem content not being loaded at the time the .Focus() method is called, but I'm not sure how to go about fixing it.

推荐答案

尝试将 .Focus() 调用放在 dispatcher.BeginInvoke 中.

Try putting the .Focus() calls inside a dispatcher.BeginInvoke.

Dispatcher.BeginInvoke(new Action(() => { txtsvc.Focus(); }));

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