问题:

在WPF中 创建了资源字典来写自定义控件 涉及到Button,CheckBox等一系列带Command属性的操作时,需要将命令绑定到我们的代码中,这时你会想到查找器,DataContext等为按钮设置绑定,特别是在ItemsControl等拥有DataTemplate等多重绑定的,最为烦人

解决:

其实很简单,自定义控件可以直接绑定到代码中,只需要在代码中设置为Static即可,代码如下:

资源字典代码:

<Style TargetType="{x:Type local:SideMenu}">
        <Style.Setters>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type local:SideMenu}">
                        <Border Width="{TemplateBinding Width}" Background="#393D49">
                            <ScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto">
                                <ItemsControl Padding="0"  Background="Transparent" BorderThickness="0" ItemTemplateSelector="{DynamicResource MenuItemSelector}" ItemsSource="{TemplateBinding ItemsSource}">
                                    <ItemsControl.Resources>
                                        <local:MenuItemDataTemplateSelector x:Key="MenuItemSelector" />
                                        <DataTemplate x:Key="MenuItemsDataTemplate">
                                            <local:NavExpander  Padding="10,0" Background="#282B33" Header="{Binding MenuName}" HeaderBackground="#393D49" IsExpanded="{Binding IsSelected}">
                                                <ItemsControl ItemTemplateSelector="{DynamicResource MenuItemSelector}" ItemsSource="{Binding Children}">
                                                    <ItemsControl.ItemsPanel>
                                                        <ItemsPanelTemplate>
                                                            <StackPanel />
                                                        </ItemsPanelTemplate>
                                                    </ItemsControl.ItemsPanel>
                                                </ItemsControl>
                                            </local:NavExpander>
                                        </DataTemplate>
                                        <DataTemplate x:Key="MenuItemDataTemplate">
                                            <RadioButton Height="40" Padding="20,0" Content="{Binding MenuName}" Command="{x:Static local:SideMenu.CheckCommand}"
                                            x:Name="menuContent" FocusVisualStyle="{x:Null}" Foreground="White" GroupName="Item" IsChecked="{Binding IsSelected,UpdateSourceTrigger=PropertyChanged,Mode=TwoWay}" CommandParameter="{Binding}"  >
                                                <RadioButton.Template>
                                                    <ControlTemplate TargetType="RadioButton">
                                                        <Grid>
                                                            <Border x:Name="bg" Background="Transparent" />
                                                            <Grid x:Name="line"  Width="5"  HorizontalAlignment="Left" Background="#50a0ff" Opacity="0" />
                                                            <ContentPresenter x:Name="dataContent"  Margin="{TemplateBinding Padding}" HorizontalAlignment="Left" VerticalAlignment="Center" IsHitTestVisible="True" Opacity="0.7" />
                                                        </Grid>
                                                        <ControlTemplate.Triggers>
                                                            <Trigger Property="IsChecked" Value="true">
                                                                <Setter TargetName="bg" Property="Background" Value="#242424" />
                                                                <Setter TargetName="dataContent" Property="Opacity" Value="1" />
                                                                <Trigger.EnterActions>
                                                                    <BeginStoryboard>
                                                                        <Storyboard>
                                                                            <DoubleAnimation
                                                                Storyboard.TargetName="line"
                                                                Storyboard.TargetProperty="Opacity"
                                                                To="1"
                                                                Duration="0:0:0.5" />
                                                                        </Storyboard>
                                                                    </BeginStoryboard>
                                                                </Trigger.EnterActions>
                                                                <Trigger.ExitActions>
                                                                    <BeginStoryboard>
                                                                        <Storyboard>
                                                                            <DoubleAnimation
                                                                Storyboard.TargetName="line"
                                                                Storyboard.TargetProperty="Opacity"
                                                                To="0"
                                                                Duration="0:0:0.5" />
                                                                        </Storyboard>
                                                                    </BeginStoryboard>
                                                                </Trigger.ExitActions>
                                                            </Trigger>
                                                            <Trigger Property="IsMouseOver" Value="true">
                                                                <Setter TargetName="bg" Property="Background" Value="#4c4c4c" />
                                                                <Setter TargetName="dataContent" Property="Opacity" Value="1" />
                                                            </Trigger>
                                                        </ControlTemplate.Triggers>
                                                    </ControlTemplate>
                                                </RadioButton.Template>
                                            </RadioButton>
                                        </DataTemplate>
                                    </ItemsControl.Resources>
                                </ItemsControl>
                            </ScrollViewer>
                        </Border>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style.Setters>
    </Style>

留意Command="{x:Static local:SideMenu.CheckCommand}"这一句

逻辑代码:

public class SideMenu : Control
    {
        public object ItemsSource
        {
            get { return (object)GetValue(ItemsSourceProperty); }
            set { SetValue(ItemsSourceProperty, value); }
        }

        // Using a DependencyProperty as the backing store for ItemsSource.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ItemsSourceProperty =
            DependencyProperty.Register("ItemsSource", typeof(object), typeof(SideMenu), new PropertyMetadata(default(object)));

        public object SelectedItem
        {
            get { return (object)GetValue(SelectedItemProperty); }
            set { SetValue(SelectedItemProperty, value); }
        }

        // Using a DependencyProperty as the backing store for SelectedItem.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty SelectedItemProperty =
            DependencyProperty.Register("SelectedItem", typeof(object), typeof(SideMenu), new PropertyMetadata(default(object)));
        
        public static DelegateCommand<object> CheckCommand { get; set; }

        public event SelectionChangedEventHandler SelectionChanged;
        public SideMenu()
        {
            CheckCommand = new DelegateCommand<object>(CheckCommandExecute);
        }

        private void CheckCommandExecute(object obj)
        {
            SelectedItem = obj;
            SelectionChanged?.Invoke(this, null);
        }

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();
        }

    }

注意public static DelegateCommand<object> CheckCommand { get; set; },要用Static修饰

标签：控件,自定义,DependencyProperty,get,SelectedItem,object,Command,SideMenu,public
来源： https://www.cnblogs.com/xiaoke-/p/16418849.html