MVVM-根据列名称隐藏Datagrid列，其中autogeneratecolumns = True

Question

I have a DataGrid that's bound to Datatable , and I want to uniquely identify rows in the DataTable using the ID , but I don't want it to be shown in the DataGrid

What I reached so far by searching and excluding:

1. Data columns are not predefined, so, I have to use AutoGenerateColumns=True , hence, I can't define the columns manually and set the Visibility property to False .
2. I can't use List or ObservableCollection to define private ID member, because the data are dynamic.
3. I am following MVVM so, I can't use AutoGeneratingColumns event handler directly and can't expose the View to the ViewModel .

The closest I get to an answer is using DataTrigger to set Visibility to False using CellStyle , but it just hid the cells, not the entire column, and I also tried it for DataGridColumnHeader and it didn't work:

code:

        <Style x:Key="ColumnStyle" TargetType="DataGridColumnHeader">
        <Style.Triggers>
            <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Value}" Value="id">
                <Setter Property="Visibility" Value="Hidden"></Setter>
            </DataTrigger>
        </Style.Triggers>
    </Style>

How to do it while maintaining the previous conditions? Thanks in advance

EDIT:

I fixed the code for DataGridColumnHeader using Path=Column.Header which doesn't make sense to me but it's irrelevant; Still, there and empty column standing there, with no idea how to remove it.

Answer 1

It sounds like you want to track the selected Item. If you want to track the "selected Element", you have to use a CollectionView.

WPF controls do not direcly bind to collections. They bind to a CollectionView. And if you do not give them one, they will create one themself from whatever collection you hand them. If you want sorting, filtering, ordering and selection tracking, CollectionView is the droid you are looking for: https://msdn.microsoft.com/en-us/library/system.windows.data.collectionview.aspx

Just take control of it's creation and expose it (rather then the raw collection).

Answer 2

I found a solution by applying this style:

<Style x:Key="ColumnStyle" TargetType="DataGridColumnHeader">
    <Style.Triggers>
        <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Value}" Value="id">
            <Setter Property="Visibility" Value="Hidden"></Setter>
        </DataTrigger>
    </Style.Triggers>
</Style>

to DataGridCell and to DataGridColumnHeader and allocating the column in the end of the table this removed the empty column from the middle of the table.