将WPF日期选择器的默认日期设置为当前日期 [英] Set the Default Date of WPF Date Picker to Current Date

问题描述

我有一个WPF Datagrid，其中一列是一个日期列。

I have a WPF Datagrid in which one of the columns is a Date Column.

所以我已经使用了一个DataTemplateColumn作为跟随

So i have used a DataTemplateColumn as Follows

<my:DataGridTemplateColumn
    CellTemplate="{StaticResource EffDateDateTimePickerControl}"
    CellEditingTemplate="{StaticResource addrEffDate}"
    Header="Effective Date"/>

在我的资源文件中，我写了以下代码：

And in my Resource File i have written the following code:

<Style TargetType="{x:Type my:Calendar}" x:Key="CalenderControlTemplate">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="my:Calendar" >
                <my:CalendarItem Name="myCalendarItem" 
                                 Background="White" 
                                 BorderBrush="Black"
                                 BorderThickness="1"
                                 VerticalAlignment="Center" />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style> 

<DataTemplate x:Key="EffDateDateTimePickerControl">
    <Label x:Name="lblEffDate" Content="{Binding effectiveDate,Mode=TwoWay}" ></Label>
</DataTemplate>

<DataTemplate x:Key="addrEffDate">
    <my:DatePicker x:Name="dpEffDate" Text="{Binding Path=effectiveDate,Mode=TwoWay}"
                   SelectedDate="{Binding Now}" DisplayDateStart="{Binding Now}"
                   CalendarStyle="{DynamicResource CalenderControlTemplate}" />
</DataTemplate>

问题是当我点击DatePicker控件时，默认日期设置为1/1/0001 ？

The problem is when i click on the DatePicker control the default date is set to 1/1/0001?

我如何设置我的datepicker设置为当前日期。

How can i set my datepicker to set to the current Date.

推荐答案

除非您在 DataContext 中有一个名为现在的属性，否则 Bindings 将失败。相反，您应该使用 {x：Static} 语法：

Unless you have a property in your DataContext called Now, your Bindings will fail. Instead, you should be using the {x:Static} syntax like so:

<DataTemplate x:Key="addrEffDate">
    <my:DatePicker x:Name="dpEffDate" Text="{Binding Path=effectiveDate,Mode=TwoWay}"
                   SelectedDate="{x:Static sys:DateTime.Now}" DisplayDateStart="{x:Static sys:DateTime.Now}"
                   CalendarStyle="{DynamicResource CalenderControlTemplate}" />
</DataTemplate>

由于 DateTime 不在标准XAML命名空间，您需要向根元素添加一个xmlns声明：

Since DateTime isn't in the standard XAML namespace, you need to add a xmlns declaration to the root element:

<UserControl xmlns:sys="clr-namespace:System;assembly=mscorlib" ...

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