左键单击wpf c＃打开上下文菜单 [英] Open contextmenu on left mouse click wpf c#

问题描述

我有一个矩形。"矩形"有一个自定义的`contextmenu`（只是在`< ContextMenu.Template>`的`ControlTemplae`中进行的一些简单的更改。）我想要的是，在鼠标左键单击时， `contextmenu`将弹出。



我尝试在矩形的'MouseDown`事件中添加`rectangle1.contextmenu.isopen = true`。是的，它会打开`contextmenu `。但是，`contextmenu`设置为在矩形的上方（顶部）打开/弹出，我通过简单地将`ContextMenuService.Placement =" top"`
添加到矩形的XAML.But来实现它。如果我在矩形的'MouseDown`事件中使用`rectangle1.contextmenu.isopen = true`，那么`contextmenu`会弹出，但是在错误的地方，它不再保持在顶部，而是跟在鼠标之后.Eg如果我点击矩形的右上角
，"contextmenu"会在右边打开/弹出。这种行为很奇怪，我不知道为什么会发生这种情况。



无论如何，如何在鼠标左键单击矩形顶部打开`contextmenu`？
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**更新**



奇怪的是，无论我添加到任何"mouseevent"的代码，上下文菜单都会丢失它的位置！例如，我甚至在mouseDown事件中添加`MsgBox（" abc"）`，然后右键单击矩形，上下文菜单不在顶部!!

解决方案

< blockquote>

这是Windows的默认设置。 我已经阅读了很多关于这个问题的内容，无论你设置什么位置，它都会显示鼠标指针的位置。

I have a rectangle.The `rectangle` has a custom `contextmenu`(just some simple changes made within the `ControlTemplae` of `<ContextMenu.Template>`).What i want is,on left mouse click,the `contextmenu` will popup.

I tried adding `rectangle1.contextmenu.isopen=true` in the rectangle's `MouseDown` event.Yes,it opens the `contextmenu`.However, the `contextmenu` is set to open/pop up above(on top) of the rectangle,i did it by simply adding `ContextMenuService.Placement="top"` to the rectangle's XAML.But if i use `rectangle1.contextmenu.isopen=true` in the rectangle's `MouseDown` event, then the `contextmenu` pops up but in the wrong place,it doesn't stay on top any more, rather it follows the mouse.E.g. If i click the right corner of the rectangle,the `contextmenu` opens/pops up in the right.This behaviour is very strange,i don't know why this is happening.

Anyway,how do i open the `contextmenu` at the top of the rectangle on left mouse click?

**UPDATE**

What's strange is that no matter what code i add to any of the `mouseevent`s,the context menu loses it's placement ! E.g.If i even add `MsgBox("abc")` on mouseDown event, and then right click on the rectangle, the context menu is not on top!!

解决方案

This is the default for Windows.  I have read lots about this problem and no matter what you set the placement to it will show up where the mouse pointer is.

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