绑定: 通过 Binding 绑定对象, 通过 x:Bind 绑定对象, 通过 Binding 绑定集合, 通过 x:Bind 绑定集合
Posted ansen312
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了绑定: 通过 Binding 绑定对象, 通过 x:Bind 绑定对象, 通过 Binding 绑定集合, 通过 x:Bind 绑定集合相关的知识，希望对你有一定的参考价值。
背水一战 Windows 10 之 绑定
- 通过 Binding 绑定对象
- 通过 x:Bind 绑定对象
- 通过 Binding 绑定集合
- 通过 x:Bind 绑定集合
示例
1、演示如何通过 Binding 绑定对象
Bind/BindingModel.xaml
<Page
x:Class="Windows10.Bind.BindingModel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Windows10.Bind"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Name="root" Background="Transparent">
<StackPanel Margin="10 0 10 10">
<TextBlock Name="lblMsg" Margin="5" />
<TextBox Text="{Binding Name, Mode=TwoWay}" Margin="5" />
<TextBox Text="{Binding Age, Mode=TwoWay}" Margin="5" />
<ToggleSwitch IsOn="{Binding IsMale, Mode=TwoWay}" OffContent="女" OnContent="男" Header="性别" Margin="5" />
</StackPanel>
</Grid>
</Page>
Bind/BindingModel.xaml.cs
/*
* 演示如何通过 Binding 绑定对象
*
*
* 如果需要数据源在属性值发生变化时对外通知，则需要实现 INotifyPropertyChanged 接口（为了简化实现，建议继承 Common/BindableBase.cs 这个类）
* PropertyChanged - 对象的属性的值发生变化时触发的事件
*/
using System;
using System.ComponentModel;
using Windows.System.Threading;
using Windows.UI.Core;
using Windows.UI.Xaml.Controls;
using Windows10.Common;
namespace Windows10.Bind
{
public sealed partial class BindingModel : Page
{
private Employee _employee;
public BindingModel()
{
this.InitializeComponent();
this.Loaded += BindingModel_Loaded;
}
void BindingModel_Loaded(object sender, Windows.UI.Xaml.RoutedEventArgs e)
{
// 创建一个需要绑定的实体对象（注：Employee 实现了 INotifyPropertyChanged 接口）
_employee = new Employee();
_employee.Name = "webabcd";
_employee.Age = 33;
_employee.IsMale = true;
// Employee 对象的属性的值发生变化时触发的事件（源自 INotifyPropertyChanged 接口）
_employee.PropertyChanged += _employee_PropertyChanged;
// 指定数据上下文（绑定的数据源）
root.DataContext = _employee;
// 每 5 秒更新一次数据
ThreadPoolTimer.CreatePeriodicTimer
(
(timer) =>
{
var ignored = Dispatcher.RunAsync
(
CoreDispatcherPriority.Normal,
() =>
{
Random random = new Random();
_employee.Age = random.Next(10, 100);
_employee.IsMale = random.Next() % 2 == 0 ? true : false;
}
);
},
TimeSpan.FromMilliseconds(5000)
);
}
// 每次属性的值发生变化时，显示变化后的结果
void _employee_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
lblMsg.Text = "属性：“" + e.PropertyName + "”的值发生了变化";
lblMsg.Text += Environment.NewLine;
lblMsg.Text += string.Format("当前的值为：Name-{0}, Age-{1}, IsMale-{2}", _employee.Name, _employee.Age, _employee.IsMale);
}
}
}
2、演示如何通过 x:Bind 绑定对象
Bind/BindModel.xaml
<Page
x:Class="Windows10.Bind.BindModel"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Windows10.Bind"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Margin="10 0 10 10">
<TextBlock Name="lblMsg" Margin="5" />
<TextBox Text="{x:Bind CurrentEmployee.Name, Mode=TwoWay}" Margin="5" />
<TextBox Text="{x:Bind CurrentEmployee.Age, Mode=TwoWay}" Margin="5" />
<ToggleSwitch IsOn="{x:Bind CurrentEmployee.IsMale, Mode=TwoWay}" OffContent="女" OnContent="男" Header="性别" Margin="5" />
</StackPanel>
</Grid>
</Page>
Bind/BindModel.xaml.cs
/*
* 演示 x:Bind 绑定的相关知识点
*
*
* 如果需要数据源在属性值发生变化时对外通知，则需要实现 INotifyPropertyChanged 接口（为了简化实现，建议继承 Common/BindableBase.cs 这个类）
* PropertyChanged - 对象的属性的值发生变化时触发的事件
*/
using System;
using System.Collections.ObjectModel;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows10.Common;
namespace Windows10.Bind
{
// x:Bind 的数据上下文就是它所属的 Page 或 UserControl
public sealed partial class BindDemo : Page
{
public BindDemo()
{
this.InitializeComponent();
}
// 事件绑定到方法，无参数
private void EventBindNoArgs()
{
CurrentEmployee.Name = "wanglei" + new Random().Next(1000, 10000).ToString();
}
// 事件绑定到方法，参数与对应的事件的参数相同
private void EventBindRegularArgs(object sender, RoutedEventArgs e)
{
CurrentEmployee.Name = "wanglei" + new Random().Next(1000, 10000).ToString();
}
// 事件绑定到方法，参数与对应的事件的参数相同，但是其中的事件参数为 object 类型
private void EventBindBaseArgs(object sender, object e)
{
CurrentEmployee.Name = "wanglei" + new Random().Next(1000, 10000).ToString();
}
public Employee CurrentEmployee { get; set; } = new Employee() { Name = "wanglei", Age = 36, IsMale = true };
public ObservableCollection<Employee> AllEmployees { get; set; } = TestData.GetEmployees(5);
}
}
3、示如何通过 Binding 绑定集合
Bind/BindingCollection.xaml
<Page
x:Class="Windows10.Bind.BindingCollection"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Windows10.Bind"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Orientation="Vertical" VerticalAlignment="Top" Margin="10 0 10 10">
<Button Name="btnDelete" Content="删除第 1 条数据" Click="btnDelete_Click" Margin="5" />
<Button Name="btnUpdate" Content="更新前 2 条数据" Click="btnUpdate_Click" Margin="5" />
<ListView x:Name="listView" Margin="5">
<ListView.ItemTemplate>
<DataTemplate>
<Border Background="Blue" Width="200" CornerRadius="3" HorizontalAlignment="Left">
<TextBlock Text="{Binding Name}" />
</Border>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackPanel>
</Grid>
</Page>
Bind/BindingCollection.xaml.cs
/*
* 演示如何通过 Binding 绑定集合
*
*
* 如果需要集合数据源在数据添加，删除，更新时对外通知，则需要实现 INotifyCollectionChanged 接口
* CollectionChanged - 集合数据在发生添加，删除，更新时触发的事件
*/
using System;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Linq;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows10.Common;
namespace Windows10.Bind
{
public sealed partial class BindingCollection : Page
{
// ObservableCollection<T> 实现了 INotifyCollectionChanged 接口
private ObservableCollection<Employee> _employees;
public BindingCollection()
{
this.InitializeComponent();
this.Loaded += BindingCollection_Loaded;
}
void BindingCollection_Loaded(object sender, RoutedEventArgs e)
{
_employees = new ObservableCollection<Employee>(TestData.GetEmployees());
// 集合数据在发生添加，删除，更新时触发的事件（源自 INotifyCollectionChanged 接口）
_employees.CollectionChanged += _employees_CollectionChanged;
// 指定 ListView 的数据源
listView.ItemsSource = _employees;
}
void _employees_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
/*
* e.Action - 引发此事件的操作类型（NotifyCollectionChangedAction 枚举）
* Add, Remove, Replace, Move, Reset
* e.OldItems - Remove, Replace, Move 操作时影响的数据列表
* e.OldStartingIndex - Remove, Replace, Move 操作发生处的索引
* e.NewItems - 更改中所涉及的新的数据列表
* e.NewStartingIndex - 更改中所涉及的新的数据列表的发生处的索引
*/
}
private void btnDelete_Click(object sender, RoutedEventArgs e)
{
// 此处的通知来自 INotifyCollectionChanged 接口
_employees.RemoveAt(0);
}
private void btnUpdate_Click(object sender, RoutedEventArgs e)
{
Random random = new Random();
// 此处的通知来自实现了 INotifyPropertyChanged 接口的 Employee
_employees.First().Name = random.Next(1000, 10000).ToString();
// 此处的通知来自 INotifyCollectionChanged 接口
_employees[1] = new Employee() { Name = random.Next(1000, 10000).ToString() };
}
}
}
4、演示如何通过 x:Bind 绑定集合
Bind/BindCollection.xaml
<Page
x:Class="Windows10.Bind.BindCollection"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Windows10.Bind"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:common="using:Windows10.Common"
mc:Ignorable="d">
<Grid Background="Transparent">
<StackPanel Orientation="Vertical" VerticalAlignment="Top" Margin="10 0 10 10">
<Button Name="btnDelete" Content="删除第 1 条数据" Click="btnDelete_Click" Margin="5" />
<Button Name="btnUpdate" Content="更新前 2 条数据" Click="btnUpdate_Click" Margin="5" />
<ListView x:Name="listView" ItemsSource="{x:Bind Employees}" Margin="5">
<ListView.ItemTemplate>
<DataTemplate x:DataType="common:Employee">
<Border Background="Blue" Width="200" CornerRadius="3" HorizontalAlignment="Left">
<TextBlock Text="{x:Bind Name, Mode=OneWay}" />
</Border>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackPanel>
</Grid>
</Page>
Bind/BindCollection.xaml.cs
/*
* 演示如何通过 x:Bind 绑定集合
*
*
* 如果需要集合数据源在数据添加，删除，更新时对外通知，则需要实现 INotifyCollectionChanged 接口
* CollectionChanged - 集合数据在发生添加，删除，更新时触发的事件
*/
using System;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Linq;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows10.Common;
namespace Windows10.Bind
{
public sealed partial class BindCollection : Page
{
// 数据源
// ObservableCollection<T> 实现了 INotifyCollectionChanged 接口
public ObservableCollection<Employee> Employees { get; set; } = new ObservableCollection<Employee>(TestData.GetEmployees());
public BindCollection()
{
this.InitializeComponent();
this.Loaded += BindCollection_Loaded;
}
void BindCollection_Loaded(object sender, RoutedEventArgs e)
{
// 集合数据在发生添加，删除，更新时触发的事件（源自 INotifyCollectionChanged 接口）
Employees.CollectionChanged += Employees_CollectionChanged;
}
void Employees_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
/*
* e.Action - 引发此事件的操作类型（NotifyCollectionChangedAction 枚举）
* Add, Remove, Replace, Move, Reset
* e.OldItems - Remove, Replace, Move 操作时影响的数据列表
* e.OldStartingIndex - Remove, Replace, Move 操作发生处的索引
* e.NewItems - 更改中所涉及的新的数据列表
* e.NewStartingIndex - 更改中所涉及的新的数据列表的发生处的索引
*/
}
private void btnDelete_Click(object sender, RoutedEventArgs e)
{
// 此处的通知来自 INotifyCollectionChanged 接口
Employees.RemoveAt(0);
}
private void btnUpdate_Click(object sender, RoutedEventArgs e)
{
Random random = new Random();
// 此处的通知来自实现了 INotifyPropertyChanged 接口的 Employee
Employees.First().Name = random.Next(1000, 10000).ToString();
// 此处的通知来自 INotifyCollectionChanged 接口
Employees[1] = new Employee() { Name = random.Next(1000, 10000).ToString() };
}
}
}
以上是关于绑定: 通过 Binding 绑定对象, 通过 x:Bind 绑定对象, 通过 Binding 绑定集合, 通过 x:Bind 绑定集合的主要内容，如果未能解决你的问题，请参考以下文章
java之多态(Polymorphic)动态绑定(Dynamic Binding)迟绑定(Late Binding)
2021-09-14 WPF上位机 10-属性绑定(数据绑定)