如何在WPF C＃中以编程方式隐藏DataGrid的单元格？

Question

Would there be any way to hide/collapse specific dataGrid cells in code-behind? Since my datatable columns are created at run-time, I'm unable to specify properties (in XAML) to properly setup these datatriggers, templateselectors, etc. I am, however, able to locate the exact cells I want to collapse by looping through the datatable to add the row/column indexes to a List (below).

I know this is unorthodox, but I've been reading threads for weeks trying to solve this and nothing has gotten me there. This seems like would be the simplest solution (if possible).

private static List<KeyValuePair<int, int>> GetCellsToHide(DataTable pivotTable)
{
    var noCellValueList = new List<KeyValuePair<int, int>>();
    foreach (DataRow row in pivotTable.Rows)
    {
        foreach (DataColumn col in pivotTable.Columns)
        {
            if (row[col].ToString() == "HideMe")
            {
                int rowIndex = pivotTable.Rows.IndexOf(row);
                int colIndex = pivotTable.Columns.IndexOf(col);

                noCellValueList.Add(new KeyValuePair<int, int>(rowIndex, colIndex));

            }
        }
    }

    return noCellValueList;
}

---

Edit: datatemplate & converter information

I'm currently building the datagrid by autogeneratingcolumns. I know the names of all other columns so I can narrow down to the dynamically generated ones. My dynamic columns are DataTemplate5, for instance (simplified version below):

private void DataGrid_AutoGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    if (e.Column.Header.ToString() == "Name")
        e.Column.Header = "File Name";

    else
    {
        string origHeader = e.Column.Header.ToString();

        DataGridTemplateColumn templateColumn = new DataGridTemplateColumn    //create new template column
        {
             Header = origHeader,
             CellTemplate = (DataTemplate)Resources["DataTemplate5"]

        }; 

        e.Column = templateColumn; // Replace the auto-generated column with the templateColumn.    
    }
}

But since I don't have the property (column) names to bind to, I haven't been able to bind it correctly. Here's my latest attempt at hiding cells via the datatemplate & ivalueconverter:

<DataTemplate x:Key="DataTemplate5">
    <DataTemplate.Resources>
        <local:StringToVisibilityConvertor x:Key="VisibilityConvertor" />
    </DataTemplate.Resources>
    <StackPanel Visibility="{Binding BindsDirectlyToSource=True, Converter={StaticResource VisibilityConvertor}}">
        <Button Name="Button1" Click="ButtonClick">
            <Button.Style>
                <Style  TargetType="Button">
                    <Style.Setters>
                        <Setter Property="Background" Value="Orange"/>
                    </Style.Setters>
                </Style>
            </Button.Style>
        </Button>
    </StackPanel>
</DataTemplate>

And the converter:

public class StringToVisibilityConvertor : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value.ToString() != "HideMe")
            return Visibility.Visible;
        return Visibility.Collapsed;
    }

Answer 1

Because of the dynamic columns, I was not able to get my bindings to work. In the end, I stumbled upon a great article by Paul Stovell on how to create the grid using the column index as the binding path. After doing this, I created a datatemplate for all columns and hid the cell with datatrigger:

http://paulstovell.com/blog/dynamic-datagrid

Answer 2

Must admit, I've never gone this far in tweaking the auto-generation of columns - I rarely use auto-generated columns, although I guess you have to as you don't know the columns until run time.

If it were me, I'd tweak the template thus:

<DataTemplate x:Key="DataTemplate5">
    <Button Name="Button1" Click="ButtonClick" Background="Orange" Content="{Binding ???}" >
    <DataTemplate.Triggers>
        <DataTrigger Binding="{Binding ???}" Value="HideMe">
            <Setter Property="Visibility" Value="Collapsed"/>
        </DataTrigger>
    </DataTemplate.Triggers>
</DataTemplate>

Saves the need for the converter. Question now though is what to put for the ???. Try nothing - ie just {Binding}.

You may also need to add a little to your code behind:

                 DataGridTemplateColumn templateColumn = new DataGridTemplateColumn    //create new template column
                 {
                     Header = origHeader,
                     CellTemplate = (DataTemplate)Resources["DataTemplate5"],
                     SortMemberPath = e.Column.SortMemberPath
                 };  

Actually, try that first - it may be enough, along with some debugging in your value converter.