PictureEdit 控件默认可以在运行时更改图片，如果不希望右键操作，只显示图片，可以禁用右键菜单。在线文档如下：
A picture edit control provides a context menu used to perform common operations such as copying, pasting, loading and saving of images. Use the RepositoryItemPictureEdit.ShowMenu property to control whether the menu is displayed when users right-click a picture editor. The RepositoryItemPictureEdit.ShowZoomSubMenu option specifies whether the context menu contains zoom-related menu commands. When the zoom sub-menu is enabled, an end-user can also zoom the image via the mouse and keyboard. See RepositoryItemPictureEdit.ShowZoomSubMenu to learn more.
代码设置时为：pictureEdit.Properties.ShowMenu = false;
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