XAML中的代码隐藏中缺少参数 [英] Missing arguments in code-behind from XAML

问题描述

我有一个压光机控件，我想确保仅显示日历模式Month和Year.这是XAML:

<日历x:Name =" calMonth"
                      Grid.Column ="1".
                      Horizo​​ntalAlignment =左"
                      VerticalAlignment ＝中心".
                      DisplayDate ="{{Binding Month，Mode = TwoWay}""
                      高度＝"30".
                      宽度＝"180".
                      保证金＝"3,0,0,0&"；
                      IsTodayHighlighted =假".
                      BorderThickness ＝"0".
                      DisplayModeChanged ="calcalth_DisplayModeChanged"

在后面的代码中，我想限制为这两种模式:

私有无效的calMonth_DisplayModeChanged(对象发送者，CalendarModeChangedEventArgs e)
        {
            Calendar cal =发件人为Calendar；
            如果(cal.DisplayMode == CalendarMode.Month)
            {
                cal.DisplayMode = CalendarMode.Year;
            }
            别的
            {
                cal.DisplayMode = CalendarMode.Month;
            }
            e.Handled = true;
        }

但是例程的执行导致"System.StackOverflowException"，说明我有一个无限循环.在调试器中检查代码表明，从未达到e.Handled = true，因为显然每个  mode更改都会在触发该函数之前 整个功能已执行.

因此，我将e.Handled = true语句放在函数顶部，现在我收到"System.InvalidOperationException"，声明必须为所有RoutedEventArgs分配一个非空的RoutedEvent.在调试器中展开e将显示RoutedEvent 属性值为null. 

有任何提示吗?

解决方案

没有时间尝试执行此操作，但是我将绑定DisplayMode，并且在setter中仅接受所需的值. /blockquote>

I have a calender control where I would like to make sure that only the calendar modes Month and Year will be displayed. This is the XAML:

            <Calendar x:Name="calMonth"
                      Grid.Column="1"
                      HorizontalAlignment="Left"
                      VerticalAlignment="Center"
                      DisplayDate="{Binding Month,Mode=TwoWay}"
                      Height="30"
                      Width="180"
                      Margin="3,0,0,0"
                      IsTodayHighlighted="False"
                      BorderThickness="0"
                      DisplayModeChanged="calMonth_DisplayModeChanged">

In the code-behind I want to restrict to those two modes:

        private void calMonth_DisplayModeChanged(object sender, CalendarModeChangedEventArgs e)
        {
            Calendar cal = sender as Calendar;
            if (cal.DisplayMode == CalendarMode.Month)
            {
                cal.DisplayMode = CalendarMode.Year;
            }
            else
            {
                cal.DisplayMode = CalendarMode.Month;
            }
            e.Handled = true;
        }

But the routine execution leads to a 'System.StackOverflowException', stating that I have an endless loop. Checking the code in debugger shows that the e.Handled = true is never reached because obviously every  mode change triggers the function before the entire function has been executed. 

So I put the e.Handled = true statement to the top of the function and now I receive the 'System.InvalidOperationException' stating that to all RoutedEventArgs there must be a non-null RoutedEvent assigned to. Expanding e in Debugger shows a RoutedEvent property with value null. 

Any hint?

解决方案

Don't have time to try this but I would bind the DisplayMode and in the setter only accept the values you want.

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