Question

我需要将“主菜单”附加到第一网格的行中，并将画布放入第二行。在运行时，我看到第二行呈现在第一行之下。为什么？怎么了？

我可以从顶部开始设置边距，但这很糟糕，在此项目中不需要。

   sudo apt-get update
Hit:1 http://pk.archive.ubuntu.com/ubuntu cosmic InRelease
    Hit:2 http://pk.archive.ubuntu.com/ubuntu cosmic-updates InRelease
    Hit:3 http://pk.archive.ubuntu.com/ubuntu cosmic-backports InRelease
    Get:4 http://security.ubuntu.com/ubuntu cosmic-security InRelease [83.2 kB]
    Ign:5 http://packages.ros.org/ros/ubuntu cosmic InRelease Err:6 http://packages.ros.org/ros/ubuntu cosmic Release 404 Not Found [IP: 64.50.236.52 80] Reading package lists... Done
    E: The repository 'http://packages.ros.org/ros/ubuntu cosmic Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.

Answer 1

<Grid.RowDefinitions>丢失：

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Canvas Grid.Row="1" Grid.Column="0"/>
    <Menu Grid.Row="0" Grid.Column="0">
    </Menu>
</Grid>

为什么Grid会把线彼此放在下面（WPF）

1 个答案: