為什么看不到我創建的菜單？

Question

因此，我正在創建一個用於娛樂的小型wpf應用程序，並且希望它具有菜單。 我創建了菜單，但沒有創建菜單，但是當我運行程序時，菜單根本不顯示。 菜單的代碼當前為：

<Window x:Class="TBA_Alpha.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="TBA LogIn" Height="350" Width="525">
<Grid>
    <PasswordBox x:Name="tbPsw" HorizontalAlignment="Left" Margin="214,143,0,0" VerticalAlignment="Top" Width="133" SelectionBrush="Black" Background="White">
        <PasswordBox.BorderBrush>
            <LinearGradientBrush EndPoint="0,20" MappingMode="Absolute" StartPoint="0,0">
                <GradientStop Color="#FFABADB3" Offset="0.05"/>
                <GradientStop Color="#FFE2E3EA" Offset="0.07"/>
                <GradientStop Color="Black" Offset="1"/>
            </LinearGradientBrush>
        </PasswordBox.BorderBrush>
    </PasswordBox>
    <TextBox x:Name="tbUId" HorizontalAlignment="Left" Height="23" Margin="214,94,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="133" SelectionBrush="Black">
        <TextBox.Background>
            <SolidColorBrush Color="White"/>
        </TextBox.Background>
        <TextBox.BorderBrush>
            <LinearGradientBrush EndPoint="0,20" MappingMode="Absolute" StartPoint="0,0">
                <GradientStop Color="#FFABADB3" Offset="0.05"/>
                <GradientStop Color="#FFE2E3EA" Offset="0.07"/>
                <GradientStop Color="Black" Offset="1"/>
            </LinearGradientBrush>
        </TextBox.BorderBrush>
    </TextBox>
    <Button Content="LogIn" HorizontalAlignment="Left" Margin="239,200,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
    <TextBlock HorizontalAlignment="Left" Margin="214,73,0,0" TextWrapping="Wrap" Text="Your UserID:" VerticalAlignment="Top"/>
    <TextBlock HorizontalAlignment="Left" Margin="214,122,0,0" TextWrapping="Wrap" Text="Your Password:" VerticalAlignment="Top"/>
    <Menu HorizontalAlignment="Left" Height="25" VerticalAlignment="Top" Width="43" BorderThickness="1">
        <MenuItem Header=" New " RenderTransformOrigin="0.5,0.5" Width="63" Height="36" Background="White" Visibility="Visible" AllowDrop="True" IsHitTestVisible="True">
            <MenuItem Header=" User " Click="newUser"/>
        </MenuItem>
    </Menu>
</Grid>

任何幫助將不勝感激，謝謝。

編輯：為wpf添加了整個XAML代碼，其中菜單位於代碼的結尾附近

編輯：刪除所有其他內容並僅保留標題后，仍然遇到相同的問題

編輯：在另一個干凈的項目中嘗試過該代碼，並且可以正常工作，謝謝

Answer 1

問題在於大多數控件都使用Magrin屬性來分隔自身，而不是使用Grid的功能。 由於它們均未指定附加屬性Grid.Row ，因此它們都位於同一行中。 由於Menu沒有指定Margin ，因此它位於Grid的頂部，因此與其他控件重疊。

嘗試使用實際的網格行

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
        <RowDefinition/>
    </Grid.RowDefinitions>

    <PasswordBox x:Name="tbPsw" HorizontalAlignment="Left" Grid.Row="0" VerticalAlignment="Top" Width="133" SelectionBrush="Black" Background="White">
        <PasswordBox.BorderBrush>
            <LinearGradientBrush EndPoint="0,20" MappingMode="Absolute" StartPoint="0,0">
                <GradientStop Color="#FFABADB3" Offset="0.05"/>
                <GradientStop Color="#FFE2E3EA" Offset="0.07"/>
                <GradientStop Color="Black" Offset="1"/>
            </LinearGradientBrush>
        </PasswordBox.BorderBrush>
    </PasswordBox>
    <TextBox x:Name="tbUId" HorizontalAlignment="Left" Height="23" Grid.Row="1" TextWrapping="Wrap" VerticalAlignment="Top" Width="133" SelectionBrush="Black">
        <TextBox.Background>
            <SolidColorBrush Color="White"/>
        </TextBox.Background>
        <TextBox.BorderBrush>
            <LinearGradientBrush EndPoint="0,20" MappingMode="Absolute" StartPoint="0,0">
                <GradientStop Color="#FFABADB3" Offset="0.05"/>
                <GradientStop Color="#FFE2E3EA" Offset="0.07"/>
                <GradientStop Color="Black" Offset="1"/>
            </LinearGradientBrush>
        </TextBox.BorderBrush>
    </TextBox>
    <Button Content="LogIn" HorizontalAlignment="Left" Grid.Row="2" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
    <TextBlock HorizontalAlignment="Left" Grid.Row="3" TextWrapping="Wrap" Text="Your UserID:" VerticalAlignment="Top"/>
    <TextBlock HorizontalAlignment="Left" Grid.Row="4" TextWrapping="Wrap" Text="Your Password:" VerticalAlignment="Top"/>
    <Menu Grid.Row="5" HorizontalAlignment="Left" Height="25" VerticalAlignment="Top" Width="43" BorderThickness="1">
        <MenuItem Header=" New " RenderTransformOrigin="0.5,0.5" Width="63" Height="36" Background="White" Visibility="Visible" AllowDrop="True" IsHitTestVisible="True">
            <MenuItem Header=" User " Click="newUser"/>
        </MenuItem>
    </Menu>
</Grid>