如何在 WPF 中的 DatePicker 中获取日历 [英] How to get a Calendar in DatePicker in WPF

问题描述

我需要在 DatePicker 对象中获取对 Calendar 的引用.

I need to get reference to a Calendar in a DatePicker object.

我想这很容易:

DatePicker datePicker = new DatePicker();
Calendar calendar = datePicker.Calendar;

但 DatePicker 中没有 Calendar 属性.

but there is no Calendar property in DatePicker.

有什么方法可以得到那个参考吗?

Is there any way how to get that reference?

推荐答案

试试这个:

private void Window_ContentRendered(object sender, EventArgs e)
{
    // Find the Popup in template
    Popup MyPopup = FindChild<Popup>(MyDatePicker, "PART_Popup");

    // Get Calendar in child of Popup
    Calendar MyCalendar = (Calendar)MyPopup.Child;

    // For test
    MyCalendar.BlackoutDates.Add(new CalendarDateRange(
            new DateTime(2013, 8, 1),
            new DateTime(2013, 8, 10)
    ));
}

注意: 总是在控件会完全加载的时候才使用FindChild，否则找不到它并给null.在这种情况下，我将此代码放在 Window 的事件 ContentRendered 中，这表示窗口的所有内容都已成功加载.

Note: Always use FindChild only when the control will be fully loaded, otherwise it will not find it and give null. In this case, I put this code in the event ContentRendered of Window which says that all the contents of the window successfully load.

FindChild<>列表:

    public static T FindChild<T>(DependencyObject parent, string childName) where T : DependencyObject
    {
        if (parent == null)
        {
            return null;
        }

        T foundChild = null;

        int childrenCount = VisualTreeHelper.GetChildrenCount(parent);

        for (int i = 0; i < childrenCount; i++)
        {
            var child = VisualTreeHelper.GetChild(parent, i);
            T childType = child as T;

            if (childType == null)
            {
                foundChild = FindChild<T>(child, childName);

                if (foundChild != null) break;
            }
            else
                if (!string.IsNullOrEmpty(childName))
                {
                    var frameworkElement = child as FrameworkElement;

                    if (frameworkElement != null && frameworkElement.Name == childName)
                    {
                        foundChild = (T)child;
                        break;
                    }
                    else
                    {
                        foundChild = FindChild<T>(child, childName);

                        if (foundChild != null)
                        {
                            break;
                        }
                    }
                }
                else
                {
                    foundChild = (T)child;
                    break;
                }
        }

        return foundChild;
    }

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