WPF 用户控件依赖注入赋值-编程知识

WPF 用户控件依赖注入赋值

前言

我一直想组件化得去开发WPF，因为我觉得将复杂问题简单化是最好的

如何组件化开发

在这里插入图片描述

主窗口引用

<Window x:Class="WpfApp1.MainWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:WpfApp1"xmlns:MD="http://materialdesigninxaml.net/winfx/xaml/themes"xmlns:Views="clr-namespace:WpfApp1.Views"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800" ><Window.Resources><Style x:Key="my_text" TargetType="TextBlock"><Setter Property="FontSize" Value="30" /><Setter Property="Margin" Value="8" /></Style></Window.Resources><Window.DataContext ><!--需要命名来指定数据源--><local:MainWindowViewModel x:Name="viewModel"/></Window.DataContext><Grid><!--不能直接写TitleValue，Binding数据源会有问题--><Views:ViewA Margin="10"Title="{Binding ElementName=viewModel,Path=TitleValue}" /></Grid>
</Window>

cs部分

namespace WpfApp1
{/// <summary>/// Interaction logic for MainWindow.xaml/// </summary>public partial class MainWindow : Window{public MainWindow(){InitializeComponent();}}public class MainWindowViewModel{public string TitleValue { get; set; } =  "我是测试数据";}
}

控件窗口

    <UserControl.DataContext><local:ViewAViewModel /></UserControl.DataContext><Grid><TextBlock Text="{Binding Title}" /></Grid>

/// <summary>
/// ViewA.xaml 的交互逻辑
/// </summary>
public partial class ViewA : UserControl
{public static readonly DependencyProperty TitleProperty;/// <summary>/// 为了拿到数据源需要定义一下/// </summary>private ViewAViewModel ViewModel = new ViewAViewModel();public ViewA(){InitializeComponent();ViewModel = (ViewAViewModel)DataContext;}static ViewA(){//静态构造TitleProperty = DependencyProperty.Register("Title", typeof(string), typeof(ViewA),new PropertyMetadata("",new PropertyChangedCallback((item, res) =>{//拿到数据，再次赋值var model =(ViewA)item;model.ViewModel.Title = (string)res.NewValue;})));}/// <summary>/// 只是为了有代码提示，添加依赖属性后不会被调用/// </summary>public string Title { get; set; }}
public partial class ViewAViewModel : ObservableObject
{/// <summary>/// 通知更新/// </summary>[ObservableProperty]private string title = "ViewA Title!";}