Question

我在DataGrid中遇到DatePicker的问题。当我在单元格中第一次单击时，DatePicker会显示当前日期，但是当我单击下一个单元格时，DataGridTextColumn日期会更改为默认值01-01-0001。如何在DataGrid中的DatePicker中保留所选日期？

                           <!--------------------------------------xaml------------------------------------------->
                            <DataGridTemplateColumn Header="Data" Width="70">
                                <DataGridTemplateColumn.CellTemplate>
                                    <DataTemplate>
                                        <TextBlock Text="{Binding DataZdarzenia, StringFormat='dd-MM-yyyy', Converter={StaticResource DateConverter}}" HorizontalAlignment="Center"/>
                                    </DataTemplate>
                                </DataGridTemplateColumn.CellTemplate>
                                <DataGridTemplateColumn.CellEditingTemplate>
                                    <DataTemplate>
                                        <DatePicker x:Name="datePicker" SelectedDate="{x:Static sys:DateTime.Now}" FirstDayOfWeek="Monday"/>
                                    </DataTemplate>
                                </DataGridTemplateColumn.CellEditingTemplate>
                            </DataGridTemplateColumn>
                           <!--------------------------------------xaml------------------------------------------->

Answer 1

这是正确的方法

创建DataConverter类

 public class DateConverter : System.Windows.Data.IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        DateTime date = (DateTime)value;
        if (date != null && date.Year != 1)
        {
            return date;
        }
        return null;
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        if (value == null)
            return DateTime.MinValue;

        DateTime val;
        if (value.ToString() == " ")
            return DateTime.MinValue;

        if (DateTime.TryParse(value.ToString(), out val))
            return val;
        else
            return DateTime.MinValue;
    }
}

在XAML中为资源添加此代码

xmlns:l="clr-namespace:Progject.Control.Converter.WPF"

    <UserControl.Resources>
    <l:DateConverter x:Key="dateConverter"/>
</UserControl.Resources>

当你有一个datepiker时，在截面网格中插入这段代码：

                <DataGridTemplateColumn SortMemberPath="StartDate" ClipboardContentBinding="{Binding StartDate}"  Header="Start date" IsReadOnly="False">
                <DataGridTemplateColumn.CellEditingTemplate>
                    <DataTemplate>
                        <DatePicker SelectedDate="{Binding Path=StartDate,Mode=TwoWay,Converter={StaticResource dateConverter}}" VerticalAlignment="Center" HorizontalAlignment="Left">
                        </DatePicker>
                    </DataTemplate>
                </DataGridTemplateColumn.CellEditingTemplate>
                <DataGridTemplateColumn.CellTemplate>
                    <DataTemplate>
                        <TextBlock Text="{Binding Path=StartDate,Mode=TwoWay,StringFormat={}{0:dd/MM/yyyy},Converter={StaticResource dateConverter}}"  VerticalAlignment="Center" HorizontalAlignment="Left">
                        </TextBlock>
                    </DataTemplate>
                </DataGridTemplateColumn.CellTemplate>
            </DataGridTemplateColumn>

Answer 2

你的绑定应该是TwoWay

<TextBlock Text="{Binding DataZdarzenia, Mode=TwoWay, StringFormat='dd-MM-yyyy', Converter={StaticResource DateConverter}}" HorizontalAlignment="Center"/>

如何在DataGrid中的DatePicker中保留所选日期？

2 个答案: