wpf 在Popup内的TextBox 输入法 不能切换

切换输入法 输入不了中文

 1 [DllImport("User32.dll")]
 2 public static extern IntPtr SetFocus(IntPtr hWnd);
 3 
 4 IntPtr GetHwnd(Popup popup)
 5 {
 6     HwndSource source = (HwndSource)PresentationSource.FromVisual(popup.Child);
 7     return source.Handle;
 8 }
 9 
10 private void ShowPopupButtonClick(object sender, RoutedEventArgs e)
11 {
12     ThePopup.IsOpen = true;
13     IntPtr handle = GetHwnd(ThePopup);
14     SetFocus(handle);
15 }
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原文地址：https://www.cnblogs.com/zsx-blog/p/7675976.html