C#WPF用户控件不在windows中

主窗口代码如下所示：

<Window x:Class="UserGUI.MainWindow"
    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:UserGUI"
    mc:Ignorable="d"
    Title="MainWindow" Height="657.278" Width="952.33" ResizeMode="CanMinimize">
<Canvas>
    <ContentControl Name="mainContentControl" Grid.Column="0" Height="585" Width="934" Canvas.Top="31"/>
    <ContentControl Name="upperMenu" Grid.Column="1" Height="31" Width="944"/>
</Canvas>

但我在主窗口中看不到用户控件。。。 看起来他们根本就不一致
我做错了什么？ LoginScreen画布是：

   <Canvas x:Name="loginCanvas" Background="BlanchedAlmond" Height="620" VerticalAlignment="Top" HorizontalAlignment="Left" Width="934">

---

希望我足够清楚

您的XAML中有一些奇怪的东西。没有网格和列，但您可以基于它进行一些定位。试试这个：

<Window x:Class="UserGUI.MainWindow"
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:local="clr-namespace:UserGUI"
Title="MainWindow" Height="657.278" Width="952.33" ResizeMode="CanMinimize">
<Canvas>
<ContentControl Name="mainContentControl" Height="585" Width="934" Canvas.Top="31" Canvas.Left="0"/>
<ContentControl Name="upperMenu" Canvas.Top="0" Canvas.Left="0" Height="31" Width="944"/>
</Canvas>

---

不，您不够清楚。什么是AdminMenu和LoginScreen。他们在哪里。显示所有代码

Height="630" Width="944">

<Window x:Class="UserGUI.MainWindow"
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:local="clr-namespace:UserGUI"
Title="MainWindow" Height="657.278" Width="952.33" ResizeMode="CanMinimize">
<Canvas>
<ContentControl Name="mainContentControl" Height="585" Width="934" Canvas.Top="31" Canvas.Left="0"/>
<ContentControl Name="upperMenu" Canvas.Top="0" Canvas.Left="0" Height="31" Width="944"/>
</Canvas>