Change text in datagrid in databound, in wpf

Question

Hi, i have a wpf datagrid,

heres my datagrid

<dg:DataGrid x:Name="dataGrid" AutoGenerateColumns="false"
             ColumnHeaderStyle="{StaticResource columnHeaderStyle}"
             AlternationCount="2" RowBackground="Beige"
             RowStyle="{StaticResource rowStyle}"
             AlternatingRowBackground="LightBlue" 

             HeadersVisibility="All"
             HorizontalGridLinesBrush="#DDDDDD"
             VerticalGridLinesBrush="#DDDDDD" Grid.ColumnSpan="2" Margin="0,0,0,26" IsReadOnly="True" ColumnHeaderHeight="30">

            <dg:DataGrid.Columns>
                <dg:DataGridTextColumn Header=" Task Id" Binding="{Binding Path=TaskId}" Width="60" />
                <dg:DataGridTextColumn Header="Order Description" Binding="{Binding Path=OrderDescription}"  Width="120"/>
                <dg:DataGridTextColumn Header="Final Client Name" Binding="{Binding Path=ClientName}"  Width="110"/>
                <dg:DataGridTextColumn Header="Order Date" Binding="{Binding Path=OrderDate}"  Width="80"/>
                <dg:DataGridTextColumn Header="Task Description" Binding="{Binding Path=TaskDescription}"  Width="130"/>
                <dg:DataGridTextColumn Header="Group Name Short" Binding="{Binding Path=GroupNameShort}"  Width="116"/>
                <dg:DataGridTemplateColumn  MinWidth="100" Header=" Actions">
                    <dg:DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button Click="DetailButton_Click">Close</Button>
                        </DataTemplate>
                    </dg:DataGridTemplateColumn.CellTemplate>
                </dg:DataGridTemplateColumn>

            </dg:DataGrid.Columns>
        </dg:DataGrid>

In aspx to change text we use onrowdatabound for example, here in wpf how can i change the field Order Description and Order Date. I have two funtions to change the text, that are convertDatetimeToDate(string datetime) e htmltotext(string text).

Answer 1

You can use a value converter on the binding. Create a class that implements IValueConverter, and set an instance of that class as the Converter property of the binding.

public class DateTimeToDateConverter
    : IValueConverter
{
    public object Convert(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        // Call convertDatetimeToDate here and return the result
        return value;
    }

    public object ConvertBack(
        object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

In your XAML, create an instance of the converter. You may need to add a namespace reference:

<Window.Resources xmlns:local="clr-namespace:YourNamespace">
    <local:DateTimeToDateConverter x:Key="myConverter"/>
</Window.Resources>

And use it in the binding:

<dg:DataGridTextColumn
    Header="Order Date"
    Binding="{Binding Path=OrderDate, Converter={StaticResource myConverter}}"
    Width="80"/>

In 3.5 SP1 or later, you can also use the StringFormat property on the binding to do simple formatting. This should format the datetime as a plain date by doing the equivalent of string.Format("{0:d}", OrderDate):

<dg:DataGridTextColumn
    Header="Order Date"
    Binding="{Binding Path=OrderDate, StringFormat='{}{0:d}'}"
    Width="80"/>