Use Text Wrapping in a WPF DataGrid TextColumn

You can simply use styles to enable text wrapping in a WPF DataGrid Column.

This sets the element style of the standard column control and of the column control that is used when the cell is in edit mode.

<DataGridTextColumn>
    <DataGridTextColumn.ElementStyle>
        <Style TargetType="TextBlock">
            <Setter Property="TextWrapping" Value="WrapWithOverflow"/>
            <Setter Property="TextTrimming" Value="WordEllipsis"/>
        </Style>
    </DataGridTextColumn.ElementStyle>
    <DataGridTextColumn.EditingElementStyle>
        <Style TargetType="TextBox">
            <Setter Property="TextWrapping" Value="Wrap"/>
        </Style>
    </DataGridTextColumn.EditingElementStyle>
</DataGridTextColumn>