今天无聊时看到必应搜索首页的菜单挺好，于是想着模仿一下。。写着写着发现和我之前做的一个MenuItem很像，干脆直接拿来用了。。。

看看效果：

上图是bing.com首页右上角的下拉菜单，今天就来做了一个这样的。。

我承认我偷懒了，哈是在以前的menuitem外面套了一个popup，

下面就看看主要代码，最后附上下载链接。

新建一个DropDownMenu用户控件：

<UserControl x:Class="wpfcore.DropDownMenu"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:wpfcore"mc:Ignorable="d" x:Name="dropdownmenu"Background="Transparent"Width="40" Height="40"d:DesignHeight="32" d:DesignWidth="32"><Grid><Border x:Name="border"Background="Transparent"Margin="8"MouseUp="OnBorderMouseDown"><Viewbox><Path Fill="Red" SnapsToDevicePixels="True" Stretch="Uniform"Data="M170.666667 213.333333h682.666666v85.333334H170.666667V213.333333z m0 512h682.666666v85.333334H170.666667v-85.333334z m0-256h682.666666v85.333334H170.666667v-85.333334z"/></Viewbox></Border><Popup Placement="Bottom" PlacementTarget="{Binding ElementName=border}"AllowsTransparency="True"IsOpen="{Binding IsOpen,ElementName=dropdownmenu}"StaysOpen="False"PopupAnimation="Slide"VerticalOffset="6"><Border Margin="6"    Background="LightBlue"><Border.Effect><DropShadowEffect BlurRadius="6" ShadowDepth="0" Color="Red"/></Border.Effect><StackPanel><local:SideMenuItem DataContext="{Binding ItemViewModel,ElementName=dropdownmenu}"IsExpanded="True"MenuItemBackground="#24ACF2"MenuItemSelectedBackground="YellowGreen"ToggleBackground="#007ACC"MenuItemSelectedChanged="S"/><local:SideMenuItem DataContext="{Binding ItemViewModel,ElementName=dropdownmenu}"MenuItemBackground="#24ACF2"MenuItemSelectedBackground="YellowGreen"ToggleBackground="#007ACC"MenuItemSelectedChanged="S"/>            </StackPanel></Border></Popup></Grid>
</UserControl>

此控件后台代码：

using System.Collections.Generic;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;namespace wpfcore
{public partial class DropDownMenu : UserControl{public bool IsOpen{get { return (bool)GetValue(IsOpenProperty); }set { SetValue(IsOpenProperty, value); }}public static readonly DependencyProperty IsOpenProperty =DependencyProperty.Register("IsOpen", typeof(bool), typeof(DropDownMenu), new PropertyMetadata(false));public DropDownMenu(){ItemViewModel = new SideMenuItemViewModel(){HeaderText = "快速开始",IconGeometry = FindResource("IconInfo") as Geometry,Items = new List<object>(){"5.0新变化","第一个项目","第一个模块","自定义用户","捐赠","FAQ"}};InitializeComponent();}private void OnBorderMouseDown(object sender, MouseButtonEventArgs e){IsOpen = !IsOpen;}public SideMenuItemViewModel ItemViewModel { get; set; }private void S(object sender, RoutedEventArgs e){}}
}

其它代码太多了，直接上链接算了，

链接：https://pan.baidu.com/s/1Ei1BNVCrvZFfv2mQlBX-MA

提取码：bfpv

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