//only set DialogResult when window is ShowDialog before
if(System.Windows.Interop.ComponentDispatcher.IsThreadModal)
m_OwningWindow.DialogResult = true;
wpf 只在window是ShowDialog打开时才设置DialogResult,布布扣,bubuko.com
wpf 只在window是ShowDialog打开时才设置DialogResult
原文：http://www.cnblogs.com/moonlight-zjb/p/3835757.html