问题：
使用wpf的popup，当在popup中弹出MessageBox或者打开对话框的时候，popup总是置顶，并遮住MessageBox或对话框.
解决：
写如下用户控件
需导入的空间: using System.Windows.Controls.Primitives;
using System.Runtime.InteropServices;
using System.Windows.Interop;
- public class CCPopup : Popup
- {
- public static DependencyProperty TopmostProperty = Window.TopmostProperty.AddOwner(typeof(CCPopup), new FrameworkPropertyMetadata(false, OnTopmostChanged));
- public bool Topmost
- {
- get { return (bool)GetValue(TopmostProperty); }
- set { SetValue(TopmostProperty, value); }
- }
- private static void OnTopmostChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e)
- {
- (obj as CCPopup).UpdateWindow();
- }
- protected override void OnOpened(EventArgs e)
- {
- UpdateWindow();
- }
- private void UpdateWindow()
- {
- var hwnd = ((HwndSource)PresentationSource.FromVisual(this.Child)).Handle;
- RECT rect;
- if (GetWindowRect(hwnd, out rect))
- {
- SetWindowPos(hwnd, Topmost ? -1 : -2, rect.Left, rect.Top, (int)this.Width, (int)this.Height, 0);
- }
- }
- #region P/Invoke imports & definitions
- [StructLayout(LayoutKind.Sequential)]
- public struct RECT
- {
- public int Left;
- public int Top;
- public int Right;
- public int Bottom;
- }
- [DllImport("user32.dll")]
- [return: MarshalAs(UnmanagedType.Bool)]
- private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect);
- [DllImport("user32", EntryPoint = "SetWindowPos")]
- private static extern int SetWindowPos(IntPtr hWnd, int hwndInsertAfter, int x, int y, int cx, int cy, int wFlags);
- #endregion
- }
