WPF日期选择器输入修改 [英] WPf Datepicker Input modification

问题描述

我创建使用WPF / C＃的形式。我期待通过编程修改/间preT用户打字输入端的 WPF工具包DatePicker的。

I am creating a form using wpf/c#. I am looking to programatically change/interpret the user's typed input in the wpf toolkit DatePicker.

例如，在用户键入今天，而当控制失去焦点除preTED和设置使用我的C＃函数的当前日期的日期。

For example, the user types "Today", and when the control looses focus the date is interpreted and set to the current date using my c# function.

我应该听LostFocus事件或有改变打字输入日期是如何解析的更好的办法？

Should I listen to the lostFocus event or is there a better way of changing how a typed input date is parsed?

我不小心更改日期选择器的显示格式。我使用MVVM模式开发这个应用程序。

I do not care to change the display format of the date picker. I am developing this application using the mvvm pattern.

推荐答案

好了，所以最后我看着的DatePicker 来源$ C ​​$ c和孤单并不多，我可以做转换器等方面，因为大多数的东西是私人的，仅有的两个可用的格式是短和长。最后，我将使用该解决方案通过以上阿维亚德创建自己的控制，可能在一部分。但是，这里有一个快速的临时解决方案，在此之前（其中 DateHelper 是我的自定义分析器类）：

Ok so finally I looked into the sourcecode of DatePicker and theres not much I can do in terms of converters etc as most stuff is private and the only two available formats are "short" and "long". Finally, I will have to create my own control, probably in part using the solution above by Aviad. However, here's a quick temporary solution until then (where DateHelper is my custom parser class):

   public class CustomDatePicker : DatePicker
    {
        protected override void OnPreviewKeyDown(KeyEventArgs e)
        {
            if (e.Key == Key.Enter)
            {
                this.TryTransformDate();
            }

            base.OnPreviewKeyDown(e);
        }

        protected override void OnPreviewLostKeyboardFocus(KeyboardFocusChangedEventArgs e)
        {
            this.TryTransformDate();
            base.OnPreviewLostKeyboardFocus(e);
        }

        protected void TryTransformDate()
        {
            DateTime tryDate;
            if (DateHelper.TryParseDate(this.Text, out tryDate))
            {
                switch (this.SelectedDateFormat)
                {
                    case DatePickerFormat.Short: 
                        {
                            this.Text = tryDate.ToShortDateString();
                            break;
                        }

                    case DatePickerFormat.Long: 
                        {
                            this.Text = tryDate.ToLongDateString();
                            break;
                        }
                }
            }

        }
    }

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