xxx #1
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using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
namespace WpfApp1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
// 创建一个包含 Student 对象的可观察列表
var students = new ObservableCollection<Student>()
{
new Student() { Name = "Alice", Age = 20 },
new Student() { Name = "Bob", Age = 21 },
new Student() { Name = "Charlie", Age = 22 },
};
// 将列表绑定到 DataGrid 的 ItemsSource 属性
DataContext = new MainViewModel() { Students = students };
}
}
public class MainViewModel
{
public ObservableCollection<Student> Students { get; set; }
}
public class Student : INotifyPropertyChanged
{
private string name;
private int age;
public string Name
{
get => name;
set
{
if (name != value)
{
name = value;
NotifyPropertyChanged(nameof(Name));
}
}
}
public int Age
{
get => age;
set
{
if (age != value)
{
age = value;
NotifyPropertyChanged(nameof(Age));
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
} |
<Window x:Class="WpfApp1.MainWindow"
...
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity">
<Grid>
<DataGrid x:Name="studentGrid" Margin="10" AutoGenerateColumns="False" ItemsSource="{Binding Students}">
...
<i:Interaction.Triggers>
<i:EventTrigger EventName="SelectionChanged">
<i:InvokeCommandAction Command="{Binding SelectionChangedCommand}" />
</i:EventTrigger>
</i:Interaction.Triggers>
</DataGrid>
</Grid>
</Window>
|
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using GalaSoft.MvvmLight;
using GalaSoft.MvvmLight.Command;
using System.Collections.Specialized;
namespace WpfApp1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
// 创建一个包含 Student 对象的可观察列表
var students = new ObservableCollection<Student>()
{
new Student() { Name = "Alice", Age = 20 },
new Student() { Name = "Bob", Age = 21 },
new Student() { Name = "Charlie", Age = 22 },
};
// 将列表绑定到 DataGrid 的 ItemsSource 属性
DataContext = new MainViewModel() { Students = students };
}
}
public class MainViewModel : ViewModelBase
{
private readonly RelayCommand selectionChangedCommand;
public MainViewModel()
{
Students.CollectionChanged += OnStudentsChanged;
selectionChangedCommand = new RelayCommand(OnSelectionChanged);
}
public ObservableCollection<Student> Students { get; set; }
public ICommand SelectionChangedCommand => selectionChangedCommand;
private void OnSelectionChanged()
{
foreach (var item in Students)
{
item.IsSelected = false;
}
foreach (var item in Students.Where(x => x.Equals(SelectedStudent)))
{
item.IsSelected = true;
}
}
private void OnStudentsChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Move)
{
var movedItem = Students[e.OldStartingIndex];
Students.RemoveAt(e.OldStartingIndex);
Students.Insert(e.NewStartingIndex, movedItem);
}
}
public Student SelectedStudent { get; set; }
}
public class Student : INotifyPropertyChanged
{
private string name;
private int age;
private bool isSelected;
public string Name
{
get => name;
set
{
if (name != value)
{
name = value;
NotifyPropertyChanged(nameof(Name));
}
}
}
public int Age
{
get => age;
set
{
if (age != value)
{
age = value;
NotifyPropertyChanged(nameof(Age));
}
}
}
public bool IsSelected
{
get => isSelected;
set
{
if (isSelected != value)
{
isSelected = value;
NotifyPropertyChanged(nameof(IsSelected));
}
}
}
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
} |
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
namespace WpfApp1
{
public class VirtualList : IList, INotifyPropertyChanged
{
private readonly int count;
private readonly Random random = new Random();
public VirtualList(int count)
{
this.count = count;
}
public int Count => count;
public bool IsFixedSize => true;
public bool IsReadOnly => true;
public bool IsSynchronized => false;
public object SyncRoot => this;
public object this[int index]
{
get => new Student() { Name = $"Student {index}", Age = random.Next(18, 30) };
set => throw new NotImplementedException();
}
public int Add(object value)
{
throw new NotImplementedException();
}
public void Clear()
{
throw new NotImplementedException();
}
public bool Contains(object value)
{
throw new NotImplementedException();
}
public void CopyTo(Array array, int index)
{
throw new NotImplementedException();
}
public IEnumerator GetEnumerator()
{
for (int i = 0; i < count; i++)
{
yield return this[i];
}
}
public int IndexOf(object value)
{
throw new NotImplementedException();
}
public void Insert(int index, object value)
{
throw new NotImplementedException();
}
public void Remove(object value)
{
throw new NotImplementedException();
}
public void RemoveAt(int index)
{
throw new NotImplementedException();
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
public class Student
{
public string Name { get; set; }
public int Age { get; set; }
}
} |
<Window x:Class="WpfApp1.MainWindow"
...
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity">
<Grid>
<DataGrid x:Name="studentGrid" Margin="10" AutoGenerateColumns="False" ItemsSource="{Binding}">
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}" />
<DataGridTextColumn Header="Age" Binding="{Binding Age}" />
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>
|
XAML 代码：
```xml
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfApp1"
Title="MainWindow" Height="450" Width="800">
<Grid>
<DataGrid x:Name="studentGrid" AutoGenerateColumns="False" CanUserAddRows="False" ItemsSource="{Binding}" RowHeaderWidth="0" SelectionMode="Single">
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}" />
<DataGridTextColumn Header="Age" Binding="{Binding Age}" />
</DataGrid.Columns>
<DataGrid.RowStyle>
<Style TargetType="DataGridRow">
<EventSetter Event="PreviewMouseLeftButtonDown" Handler="OnPreviewMouseLeftButtonDown" />
<EventSetter Event="PreviewMouseLeftButtonUp" Handler="OnPreviewMouseLeftButtonUp" />
<EventSetter Event="PreviewMouseMove" Handler="OnPreviewMouseMove" />
</Style>
</DataGrid.RowStyle>
</DataGrid>
</Grid>
</Window>
|
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace WpfApp1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new VirtualList(10);
studentGrid.PreviewMouseMove += StudentGrid_PreviewMouseMove;
studentGrid.Drop += StudentGrid_Drop;
}
private int dragIndex = -1;
private int dropIndex = -1;
private Point startPoint;
private void StudentGrid_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed && dragIndex != -1)
{
Point currentPoint = e.GetPosition(studentGrid);
double distance = (startPoint - currentPoint).Length;
if (distance > 10)
{
DataObject dataObject = new DataObject();
dataObject.SetData("index", dragIndex);
DragDrop.DoDragDrop(studentGrid, dataObject, DragDropEffects.Move);
}
}
}
private void StudentGrid_Drop(object sender, DragEventArgs e)
{
int index = (int)e.Data.GetData("index");
if (dropIndex != -1 && dropIndex != index)
{
VirtualList list = (VirtualList)DataContext;
object temp = list[index];
if (dropIndex > index)
{
for (int i = index; i < dropIndex; i++)
{
list[i] = list[i + 1];
}
}
else
{
for (int i = index; i > dropIndex; i--)
{
list[i] = list[i - 1];
}
}
list[dropIndex] = temp;
}
dragIndex = -1;
dropIndex = -1;
}
private void OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
dragIndex = ((DataGridRow)sender).GetIndex();
startPoint = e.GetPosition(studentGrid);
}
private void OnPreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
dragIndex = -1;
}
private void OnPreviewMouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed && dragIndex != -1)
{
Point currentPoint = e.GetPosition(studentGrid);
double distance = (startPoint - currentPoint).Length;
if (distance > 10)
{
dropIndex = GetDropIndex(e.GetPosition(studentGrid));
}
}
}
private int GetDropIndex(Point position)
{
int index |
private int GetDropIndex(Point position)
{
int index = -1;
for (int i = 0; i < studentGrid.Items.Count; i++)
{
DataGridRow row = (DataGridRow)studentGrid.ItemContainerGenerator.ContainerFromIndex(i);
if (row != null)
{
Rect bounds = VisualTreeHelper.GetDescendantBounds(row);
bounds.Location = row.TranslatePoint(bounds.Location, studentGrid);
if (position.Y >= bounds.Top && position.Y < bounds.Bottom)
{
index = i;
break;
}
}
}
return index;
}
} |
private void DataGrid_PreviewMouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
MyData selectedData = dataGrid.SelectedItem as MyData;
if (selectedData != null)
{
DataObject dragData = new DataObject(typeof(MyData), selectedData);
DragDrop.DoDragDrop(dataGrid, dragData, DragDropEffects.Move);
}
}
}
private void DataGrid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
dataGrid.AllowDrop = true;
}
private void DataGrid_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
dataGrid.AllowDrop = false;
}
private void DataGrid_Drop(object sender, DragEventArgs e)
{
MyData draggedData = e.Data.GetData(typeof(MyData)) as MyData;
MyData targetData = (e.OriginalSource as FrameworkElement).DataContext as MyData;
int targetIndex = dataList.IndexOf(targetData);
int draggedIndex = dataList.IndexOf(draggedData);
if (targetIndex != draggedIndex)
{
dataList.Move(draggedIndex, targetIndex);
}
} |
<DataGrid x:Name="dataGrid" AllowDrop="True"
PreviewMouseMove="DataGrid_PreviewMouseMove"
PreviewMouseLeftButtonDown="DataGrid_PreviewMouseLeftButtonDown"
PreviewMouseLeftButtonUp="DataGrid_PreviewMouseLeftButtonUp"
Drop="DataGrid_Drop" />
|
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