WPF 02

Grid容器

分行和分列

跨行和跨列

stackPanel：默认垂直排列

局部容器，一般修饰部分空间的元素排布

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WrapPanel ：默认水平排序且换行

WrapPanel可以自动换行

DockPanel：默认最后一个元素填充剩余所有空间

取消最后一个元素填充剩余所有空间：

DockPanel可以停靠

UniformGrid: 在有限的空间内根据控件均分剩余空间

ctrl+k+d：自动格式化代码

课程案例1

模块划分代码：

练习案例1

样式的使用方法

数据模板

案例1

MainWindow.xaml

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfDay01
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            List test = new List();
            test.Add(new Color() { Code= "#FF69B4", Name= "热情的粉红" });
            test.Add(new Color() { Code= "#C71585", Name= "适中的紫罗兰红色" });
            test.Add(new Color() { Code= "#DA70D6", Name= "兰花的紫色" });
            list.ItemsSource = test;
        }
    }
    public class Color
    {
        public string Code { get; set; }
        public string Name { get; set; }
    }
}

案例2

MainWindow.xaml

MainWindow.xaml.cs

namespace WpfDay01
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {

            InitializeComponent();
            List test = new List();
            test.Add(new Color() { Code= "#FF69B4", Name= "热情的粉红" });
            test.Add(new Color() { Code= "#C71585", Name= "适中的紫罗兰红色" });
            test.Add(new Color() { Code= "#DA70D6", Name= "兰花的紫色" });
            grid.ItemsSource = test;
        }
    }
    public class Color
    {
        public string Code { get; set; }
        public string Name { get; set; }
    }
}

修改dataTemplete

绑定方法

双向数据绑定关系

绑定模式

TextBox数据绑定

MainWindow.xaml

创建类test

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfDay01
{
    class Test
    {
        public string Name { get; set; }
    }
}

MainWindow.xaml.cs

namespace WpfDay01
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new Test()
            {
                Name = "张三"
            };
        }
    }
    public class Color
    {
        public string Code { get; set; }
        public string Name { get; set; }
    }
}

ICommand使用方法

业务逻辑代码：MainViewModel.cs

UI代码：MainWindow.xaml

实现ICommand中的接口：MyCommand.cs

将View与ViewModel挂钩：MainWindow.xaml.cs

MyCommand.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;

namespace WpfDay01
{
    public class MyCommand : ICommand
    {
        Action executeAction;
        Func canExecuteAction;
        public MyCommand(Action action,Func canExcuteAction)
        {
            executeAction = action;
            canExecuteAction = canExcuteAction;
        }
        public event EventHandler CanExecuteChanged;

        public bool CanExecute(object parameter)
        {
            return canExecuteAction();
        }

        public void Execute(object parameter)
        {
            executeAction();
        }
    }
}

MainViewModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
namespace WpfDay01
{
    public class MainViewModel
    {
        public MainViewModel()
        {
            ShowCommand = new MyCommand(Show,canExcuteAction);
            ShowCommand2 = new MyCommand(show2, canExcuteAction2);
        }
        private string myname="a";
        public string MyName
        {
            get { return myname; }
            set { myname = value; }
        }

        private bool canExcuteAction()
        {
            if (string.IsNullOrEmpty(MyName))
                return false;
            return true;
        }
        private bool canExcuteAction2()
        {   
            return true;
        }
        public MyCommand ShowCommand { get; set; }
        public MyCommand ShowCommand2 { get; set; }
        public void Show()
        {
            MessageBox.Show("点击了按钮！");
        }
        public void show2()
        {
            MyName = "b";
            MessageBox.Show(MyName);
        }
    }
}

MainWindow.xaml

MainWindow.xaml.cs

DataContext：连接View与ViewModel挂钩。

public partial class MainWindow : Window
    {
        public MainWindow()
        {

            InitializeComponent();
            this.DataContext = new MainViewModel();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("hhhh");
        }
    }

更新UI界面：INotifyPropertyChanged

业务逻辑代码：MainViewModel.cs

UI代码：MainWindow.xaml

实现ICommand中的接口：MyCommand.cs

将View与ViewModel挂钩：MainWindow.xaml.cs

INotifyPropertyChanged更新界面：ViewModelBase.cs

ViewModelBase.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
namespace WpfDay01
{
    class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        public void OnPropertyChanged([CallerMemberName]string propertyName="")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

MyCommand.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace WpfDay01
{
    class MyCommand : ICommand
    {
        Action executeAction;
        public MyCommand(Action action)
        {
            executeAction = action;     
        }
        public event EventHandler CanExecuteChanged;

        public bool CanExecute(object parameter)
        {
            return true;
        }
        public void Execute(object parameter)
        {
            executeAction();
        }
    }
}

MainViewModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace WpfDay01
{
    class MainViewModel: ViewModelBase
    {
        public MainViewModel()
        {
            MyName = "Hello";
            ShowCommand = new MyCommand(Show);
            ShowCommand2 = new MyCommand(show2);
        }

        private string myname;
        public string MyName
        {
            get { return myname; }
            set { 
                myname = value;
                OnPropertyChanged();
                }
        }

        private string myTitle;
        public string MyTitle
        {
            get { return myTitle; }
            set { myTitle = value; OnPropertyChanged(); }
        }


        public MyCommand ShowCommand { get; set; }
        public MyCommand ShowCommand2 { get; set; }
        
        public void Show()
        {
            MyName = "点击了按钮";
            MyTitle = "myTitle";
            MessageBox.Show("点击了按钮！");
        }
        public void show2()
        {
            MyName = "b";
            MyTitle = "myTitle2";
            MessageBox.Show(MyName);
        }
    }
}

MainWindow.xaml

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfDay01
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("hhhh");
        }
    }
}

MvvmLight框架

使用MvvmLight框架后不需要自定义MyCommand和ViewModelBase，直接调用即可。

MainViewModel.cs

using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
namespace WpfDay02
{
    class MainViewModel: ViewModelBase
    {
        public MainViewModel()
        {
            MyName = "hello!";
            ShowCommand = new RelayCommand(Show);
        }
        public RelayCommand ShowCommand { get; }
        private string myName;
        public string MyName
        {
            get { return myName; }
            set { myName = value; RaisePropertyChanged(); }
        }
        public void Show()
        {
            MyName = "按下了按钮！";
            MessageBox.Show("按下了按钮！");
        }
    }
}

MainWindow.xaml

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfDay02
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();
        }
    }
}

将某个控件的内容关联到另外控件上（泛型的使用）

MainViewModel.cs

using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
namespace WpfDay02
{
    class MainViewModel: ViewModelBase
    {
        public MainViewModel()
        {
            MyName = "hello!";
            ShowCommand = new RelayCommand(Show);
        }
        public RelayCommand ShowCommand { get; }
        private string myName;

        public string MyName
        {
            get { return myName; }
            set { myName = value; RaisePropertyChanged(); }
        }
        public void Show(string content)
        {
            MyName = "按下了按钮！";
            MessageBox.Show(content);
        }
    }
}

MainWindow.xaml

将textBox中的内容通过button按钮显示到messageBox中。

使用Messenger注册接收消息

修改部分：MainWindow.xaml.cs和MainViewModel.cs

MainWindow.xaml.cs

using GalaSoft.MvvmLight.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfDay02
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();
            //注册一个接收string类型参数的消息，地址是Token1
            Messenger.Default.Register(this, "Token1", Show);
        }
        void Show(string value)
        {
            MessageBox.Show(value);
        }
    }
}

MainViewModel.cs

using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using GalaSoft.MvvmLight.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
namespace WpfDay02
{
    class MainViewModel: ViewModelBase
    {
        public MainViewModel()
        {
            MyName = "hello!";
            ShowCommand = new RelayCommand(Show);
        }
        public RelayCommand ShowCommand { get; }
        private string myName;
        public string MyName
        {
            get { return myName; }
            set { myName = value; RaisePropertyChanged(); }
        }
        public void Show(string content)
        {
            MyName = "按下了按钮！";
            //MessageBox.Show(content);
            //给Token1的地址发送一个string类型的值 content
            Messenger.Default.Send(content, "Token1");
        }
    }
}

效果与上面案例相同

CommunityToolkit.Mvvm框架

MainViewModel.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace WpfDay02
{
    class MainViewModel: ObservableObject 
    {
        public MainViewModel()
        {
            MyName = "hello!";
            ShowCommand = new RelayCommand(Show);
        }
        public RelayCommand ShowCommand { get; }
        private string myName;

        public string MyName
        {
            get { return myName; }
            set { myName = value; OnPropertyChanged(); }
        }
        public void Show(string content)
        {
            MyName = "按下了按钮！";
            //MessageBox.Show(content);
            WeakReferenceMessenger.Default.Send(content, "Token1");           
        }
    }
}

MainWindow.xaml.cs

using CommunityToolkit.Mvvm.Messaging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using Sysatem.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfDay02
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = new MainViewModel();

            WeakReferenceMessenger.Default.Register(this, "Token1", (s, e)=>
            {
                MessageBox.Show(e);
            });
        } 
    }
}

MainWindow.xaml