CODEWITHSUNDEEP
wpfdatagrid
user1134489
user1134489

Reputation: 25

Changing background of datagrid cell

I am able to change background of datacell through following C# code -

    private void Retrieve_rows(object item)
    {
        DataRow row = mygrid.GetContainerFromItem(item) as DataGrid.DataRow;

        if (row != null)
        {
            SolidColorBrush redColor = new SolidColorBrush (Colors.Red);

            foreach (DataGrid.DataCell cell in row.Cells)
            {
                 var dc = ((System.Windows.FrameworkElement)(((DataGrid.Cell)(cell)).ParentRow)).DataContext;   

              // get my custom object and change color if IsBlank value is set to true
                MyRowObject rowObject = dc as MyRowObject;

                for (int counter = 0; counter < rowObject.values.Count; counter++)
                {
                        if (rowObject.values[counter].IsBlank == true)
                            row.Cells[counter].Background = redColor;
                    }
                }
                return;
            }
        }
    }

But with this code, application performance degrades to great extent. Is there any way to convert above code to XAML Triggers / or any other way to improve the performance of the grid.

Upvotes: 0

Views: 1605

Answers (3)

Rachel
Rachel

Reputation: 132558

Since you need two dynamic values to determine the background color of the cell (ColumnIndex and the ValuesList), you'll need to use a MultiConverter which accepts these two values and returns a color.

For example, 

if ValueList[ColumnIndex].IsBlank)
    Return Colors.Red; // Might be Brushes.Red too, can't remember
else
    Return Colors.White;

The Trigger can then be applied implicitly to all DataGridCells with a style that doesn't have a Key specified

<Style TargetType="{x:Type DataGridCell}">
    <Setter Property="Background">
        <Setter.Value>
            <MultiBinding Converter="{StaticResource MyMultiConverter}">
                <Binding Path="Column.DisplayIndex" RelativeSource="{RelativeSource Self}" />
                <Binding Path="ValueList" />
            </MultiBinding>
        </Setter.Value>
    </Setter>
</Style>

I might have the RelativeSource syntax wrong in the Column.DisplayIndex binding of the MultiBinding, however the binding should point to Self, which is the DataGridCell

Upvotes: 3

Kris
Kris

Reputation: 68

I think you can't because the datagrid only defines structure not style.
I use rectangles in a grid cell.

    <Rectangle Grid.Column="1" Grid.Row="1" Fill="Red"></Rectangle>
    <TextBox Grid.Column="1" Grid.Row="1" Background="Transparent" Text="test"></TextBox>

Upvotes: 0

Sebastian Edelmeier
Sebastian Edelmeier

Reputation: 4157

Welcome to the WPF world ;)

You could try this:

<DataGrid Name="myGrid">
   <DataGrid.Columns>
     <DataGridTextColumn Header="Col1" Binding="{Binding Col1}" />
     <DataGridTextColumn Header="Col2" Binding="{Binding Col2}" />
   </DataGrid.Columns>
 <DataGrid.CellStyle>
   <Style TargetType="{x:Type DataGridCell}">
    <Setter Property="Background" Value="Red" />
   </Style>
  </DataGrid.CellStyle>
</DataGrid>

Cheers,

Sebi

Upvotes: 0

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