Repository navigation
没有数据时DataGrid的表头无法显示 #903
Description
Describe the bug
自从3.0升级到3.2后发现用到DataGrid的地方，当ItemSource.Count=0时，DataGrid不会显示ColumnHeader，翻看了其模板后发现是特意这么改的。判断逻辑为当HasItem=False，即没有数据的时候显示的是hc:Empty，如下。
<hc:ToggleBlock IsChecked="{Binding HasItems,RelativeSource={RelativeSource TemplatedParent},Mode=OneWay}" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
<hc:ToggleBlock.CheckedContent>
<ScrollViewer x:Name="DG_ScrollViewer" Focusable="false">
...
</ScrollViewer>
</hc:ToggleBlock.CheckedContent>
<hc:ToggleBlock.UnCheckedContent>
<hc:Empty />
</hc:ToggleBlock.UnCheckedContent>
</hc:ToggleBlock>这样一来表格区域一片空白，看着会很奇怪，就比如我这个界面：
尤其是在一些设置界面，首次打开肯定是没有数据的，也不显示表头。。。
Expected behavior
是不是可以考虑参照Web上的表格显示效果，保留表头，下方显示hc:Empty，并给hc:Empty定以一个默认模板，这样不会导致界面上啥都不显示。
Screenshots
If applicable, add screenshots to help explain your problem.
Environment (please complete the following information):
- .net: 4.6.1
- IDE vs2019
- Version 3.2.0
Activity
ghost1372 commentedon Jul 8, 2021
First, please type in English
Second, if you want to display hc:Empty, you need to set up an AttachedProperty
hc:Empty.ShowEmpty="true"for the datagrid.also if you need to use hc:Empty in another way again you should set
hc:Empty.ShowEmpty="true"please read docs
lwqwag commentedon Jul 30, 2021
I found a issue when set DataGridTextColumn Width="*“ the header not visible when data is empty as blow code.
<DataGrid hc:Empty.ShowEmpty="True" AutoGenerateColumns="False" CanUserAddRows="False" CanUserSortColumns="False" HeadersVisibility="All" ItemsSource="{Binding TestData}"> <DataGrid.Columns> <DataGridTextColumn Width="*" Header="TEST1" /> <DataGridTextColumn Width="*" Header="TEST2" /> <DataGridTextColumn Width="*" Header="TEST3" /> <DataGridTextColumn Width="*" Header="TEST4" /> </DataGrid.Columns> </DataGrid>ObservableCollection<Class> TestData=new ();fixed HandyOrg#903