WPF 4.5 - WPF 窗口顶部属性不会更改

Question

我刚刚将我的WPF应用程序目标框架从3.5升级到4.5，并且我用于设置Top属性的代码停止工作，它不会更改最大值：

this.Top=45;

它将始终保持以前的值，从未更改为45
我没有任何类型的动画
为什么它会这样

窗口XAML

<Window x:Class="SalesOrderLib.SalesOrderInquiry"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:Datepicker="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit"
    xmlns:UI="clr-namespace:SalesOrderLib.Resources.UI"
    xmlns:local="clr-namespace:SalesOrderLib"
    xmlns:global="clr-namespace:SalesOrderLib.Common"
    xmlns:validation="clr-namespace:SalesOrderLib.ValidationRules"
    Background="{DynamicResource WinBackgroundBrush}" 
    Icon="Resources/Images/ToolBar/OrderInquiry.png"
    Title="Sales Order - Inquiry Mode" 
    Height="630" 
    Width="1024"
    WindowState="Normal"
    ShowInTaskbar="True"
    ResizeMode="CanResize"
    WindowStyle="SingleBorderWindow"
    WindowStartupLocation="Manual"
    FocusManager.FocusedElement="{Binding ElementName=txtOrderNo}"
    Loaded="Window_Loaded" 
    ContentRendered="Window_ContentRendered"
    GotFocus="Window_GotFocus" 
    Closing="Window_Closing"
    LocationChanged="Window_LocationChanged" 
    Activated="Window_Activated">

以下是我尝试在代码隐藏中设置Top属性的地方：

 private void Window_LocationChanged(object sender, EventArgs e)
 {
     try
     {
         if (this.Top < 55D)
             this.Top = 55D;
         if (this.Height > 120D)
             this.lstBoxMediaNo.Height = (this.Height - 120D); //Set mediaNo PopUp height.
         Thread.Sleep(25); //Allow window to refresh.
     }
     catch (Exception ex)
     {
         log.Error(String.Format(GlobalResources.MsgException, ex.ToString(), GetType().Name, MethodBase.GetCurrentMethod().Name));
         MessageBox.Show(ex.Message, GlobalResources.Error, MessageBoxButton.OK, MessageBoxImage.Error);
     }
 }

Answer 1

您确定WindowStartupLocation设置为Manual吗？这就是为什么它不应该尊重您的代码的唯一原因。