调用函数打开Main_win.xaml时WPF窗口无内容显示求助

问题 #

WPF开发中，通过Application_Startup函数打开Main_win.xaml窗口时，窗口无法显示任何控件（包括按钮、Ribbon等），添加新控件也无效果。

相关代码 #

App.xaml #

<Application x:Class="test.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:local="clr-namespace:salesandwarehousingsystem"
         ShutdownMode="OnExplicitShutdown" 
         Startup  = "Application_Startup" >
</Application>

App.xaml.cs #

private void Application_Startup(object sender, StartupEventArgs e)
{
    Main_win main_Win = new Main_win();
    main_Win.ShowDialog();
}

Main_win.xaml #

<Window x:Class="test.window.Main_win"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:local="clr-namespace:salesandwarehousingsystem.window"
    xmlns:custom="http://schemas.microsoft.com/winfx/2006/xaml/presentation/ribbon" 
    mc:Ignorable="d"
    Title="Main_win" Height="660" Width="1300">
<Grid>
    
    <Ribbon >
        <Ribbon.QuickAccessToolBar>
            <RibbonQuickAccessToolBar >
                <RibbonSplitButton  >
                    <RibbonSplitMenuItem Header=" About Us"/>
                    <RibbonSplitMenuItem Header=" Contact Us"/>
                    <RibbonSplitMenuItem Header=" Exit"/>
                </RibbonSplitButton>
            </RibbonQuickAccessToolBar>
        </Ribbon.QuickAccessToolBar>
        <Button Content="Button" Height="21" Width="136"/>
    </Ribbon>
    <Button Content="Button" Margin="561,282,422,282"/>

</Grid>
</Window>

运行效果 #

解决思路 #

1. 统一命名空间
   App.xaml中x:Class为test.App，但xmlns:local指向salesandwarehousingsystem；Main_win.xaml中x:Class为test.window.Main_win，xmlns:local指向salesandwarehousingsystem.window，命名空间完全混乱。需将项目的代码文件命名空间与XAML中的x:Class、xmlns:local统一，例如：

   • 将App.xaml的x:Class改为salesandwarehousingsystem.App
   • 将Main_win.xaml的x:Class改为salesandwarehousingsystem.window.Main_win
   • 确保对应的cs文件中namespace声明与XAML一致

2. 检查XAML编译设置
   右键项目→属性→生成，确认所有XAML文件的生成操作为Page，这是WPF正确加载XAML界面的必要条件。

3. 确保初始化方法被调用
   检查Main_win.xaml.cs的构造函数，确认存在InitializeComponent()调用，该方法负责加载XAML中定义的界面元素，缺失会导致窗口空白：

   public Main_win()
   {
       InitializeComponent();
   }
   

内容的提问来源于stack exchange，提问作者Hossein