\n\u652f\u6301\u5341\u4e07\u7ea7\u5927\u6570\u636e\u6d41\u7545\u6eda\u52a8，\u65e0\u5361\u987f\u3001\u65e0\u5361\u6b7b<\/p>\n<\/li>\n<\/ul>\n
\u516d\u3001\u5b8c\u6574\u6e90\u7801（\u53ef\u76f4\u63a5\u843d\u5730\u4f7f\u7528）<\/h3>\n6.1 \u516c\u5171\u5b9e\u4f53\u6a21\u578b ItemModel<\/h4>\n
\/\/\/ <summary>
\n\/\/\/ \u901a\u7528\u5217\u8868\u6d4b\u8bd5\u5b9e\u4f53\u6a21\u578b
\n\/\/\/ <\/summary>
\npublic class ItemModel
\n{
\n public int Id { get; set; }
\n public string Name { get; set; }
\n}<\/p>\n
6.2 \u6807\u51c6 MVVM ViewModel<\/h4>\n
using System;
\nusing System.Collections.ObjectModel;
\nusing System.ComponentModel;
\nusing System.Runtime.CompilerServices;<\/p>\n
\/\/\/ <summary>
\n\/\/\/ \u901a\u7528\u61d2\u52a0\u8f7d\u5217\u8868ViewModel，\u7eafMVVM\u65e0\u5197\u4f59\u4ee3\u7801
\n\/\/\/ <\/summary>
\npublic class LazyListViewModel : INotifyPropertyChanged
\n{
\n private ObservableCollection<ItemModel> _items;<\/p>\n
\/\/\/ <summary>
\n \/\/\/ \u5168\u91cf\u7ed1\u5b9a\u6570\u636e\u6e90，\u652f\u6301\u591a\u6b21\u66ff\u6362\u5237\u65b0
\n \/\/\/ <\/summary>
\n public ObservableCollection<ItemModel> Items
\n {
\n get => _items;
\n set
\n {
\n _items = value;
\n OnPropertyChanged();
\n }
\n }<\/p>\n
public event PropertyChangedEventHandler PropertyChanged;<\/p>\n
protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
\n {
\n PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
\n }
\n}<\/p>\n
6.3 LazyDataGrid \u5b8c\u6574\u6e90\u7801<\/h4>\n
using System;
\nusing System.Collections;
\nusing System.Collections.ObjectModel;
\nusing System.Windows;
\nusing System.Windows.Controls;
\nusing System.Windows.Media;<\/p>\n
namespace WpfAttachedLazyLoad
\n{
\n public class LazyDataGrid : DataGrid
\n {
\n #region DependencyProperties
\n public static readonly DependencyProperty IsEnabledProperty =
\n DependencyProperty.Register(
\n nameof(IsEnabled),
\n typeof(bool),
\n typeof(LazyDataGrid),
\n new PropertyMetadata(false, OnIsEnabledChanged));<\/p>\n
public bool IsEnabled
\n {
\n get => (bool)GetValue(IsEnabledProperty);
\n set => SetValue(IsEnabledProperty, value);
\n }<\/p>\n
public static readonly DependencyProperty PreloadScreenProperty =
\n DependencyProperty.Register(
\n nameof(PreloadScreen),
\n typeof(double),
\n typeof(LazyDataGrid),
\n new PropertyMetadata(1.2));<\/p>\n
public double PreloadScreen
\n {
\n get => (double)GetValue(PreloadScreenProperty);
\n set => SetValue(PreloadScreenProperty, value);
\n }<\/p>\n
\/\/\/ <summary>\u5b8c\u6574\u539f\u59cb\u6570\u636e\u6e90，ViewModel\u7ed1\u5b9a\u5165\u53e3<\/summary>
\n public static readonly DependencyProperty AllItemsProperty =
\n DependencyProperty.Register(
\n nameof(AllItems),
\n typeof(IList),
\n typeof(LazyDataGrid),
\n new PropertyMetadata(null, OnAllItemsChanged));<\/p>\n
public IList AllItems
\n {
\n get => (IList)GetValue(AllItemsProperty);
\n set => SetValue(AllItemsProperty, value);
\n }<\/p>\n
\/\/\/ <summary>\u5185\u90e8\u53ef\u89c6\u5b50\u96c6，\u771f\u6b63\u7ed1\u5b9a\u5230ItemsSource\u7528\u4e8e\u6e32\u67d3<\/summary>
\n private static readonly DependencyProperty VisibleItemsProperty =
\n DependencyProperty.Register(
\n nameof(VisibleItems),
\n typeof(ObservableCollection<object>),
\n typeof(LazyDataGrid),
\n new PropertyMetadata(null));<\/p>\n
private ObservableCollection<object> VisibleItems
\n {
\n get => (ObservableCollection<object>)GetValue(VisibleItemsProperty);
\n set => SetValue(VisibleItemsProperty, value);
\n }
\n #endregion<\/p>\n
#region Private Fields & \u4e0a\u4e0b\u6587
\n private LazyLoadContext _lazyCtx;
\n private ScrollViewer _scrollViewer;<\/p>\n
\/\/\/ <summary>\u61d2\u52a0\u8f7d\u4e0a\u4e0b\u6587\u7f13\u5b58<\/summary>
\n private class LazyLoadContext
\n {
\n public int PageSize { get; set; }
\n public int LoadedItemIndex { get; set; }
\n public bool IsLoading { get; set; }
\n public double MeasuredRowHeight { get; set; }
\n }
\n #endregion<\/p>\n
#region \u4f9d\u8d56\u5c5e\u6027\u53d8\u66f4\u56de\u8c03
\n private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
\n {
\n var grid = d as LazyDataGrid;
\n bool enable = (bool)e.NewValue;
\n if (enable)
\n grid.AttachLazy();
\n else
\n grid.DetachLazy();
\n }<\/p>\n
private static void OnAllItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
\n {
\n var grid = d as LazyDataGrid;
\n if (!grid.IsEnabled) return;
\n \/\/ \u6570\u636e\u6e90\u6574\u4f53\u66ff\u6362，\u81ea\u52a8\u91cd\u7f6e\u5206\u9875
\n grid.Reset();
\n }
\n #endregion<\/p>\n
#region \u61d2\u52a0\u8f7d\u6302\u8f7d\/\u5378\u8f7d\u751f\u547d\u5468\u671f
\n private void AttachLazy()
\n {
\n if (_lazyCtx != null) return;<\/p>\n
_lazyCtx = new LazyLoadContext();
\n VisibleItems = new ObservableCollection<object>();
\n ItemsSource = VisibleItems;<\/p>\n
\/\/ \u7ed1\u5b9a\u751f\u547d\u5468\u671f\u4e8b\u4ef6
\n Loaded += Host_Loaded;
\n Unloaded += Host_Unloaded;
\n SizeChanged += Host_SizeChanged;
\n ItemContainerGenerator.StatusChanged += Generator_StatusChanged;
\n }<\/p>\n
private void DetachLazy()
\n {
\n \/\/ \u89e3\u7ed1\u6eda\u52a8\u4e8b\u4ef6，\u9632\u6b62\u5185\u5b58\u6cc4\u6f0f
\n if (_scrollViewer != null)
\n {
\n _scrollViewer.ScrollChanged -= ScrollViewer_ScrollChanged;
\n _scrollViewer = null;
\n }<\/p>\n
\/\/ \u89e3\u7ed1\u6240\u6709\u751f\u547d\u5468\u671f\u4e8b\u4ef6
\n Loaded -= Host_Loaded;
\n Unloaded -= Host_Unloaded;
\n SizeChanged -= Host_SizeChanged;
\n ItemContainerGenerator.StatusChanged -= Generator_StatusChanged;<\/p>\n
_lazyCtx = null;
\n VisibleItems = null;
\n ItemsSource = null;
\n }
\n #endregion<\/p>\n
#region \u9012\u5f52\u67e5\u627e\u5185\u90e8ScrollViewer
\n private ScrollViewer FindScrollViewer(DependencyObject parent)
\n {
\n if (parent == null) return null;
\n if (parent is ScrollViewer sv) return sv;<\/p>\n
int childCount = VisualTreeHelper.GetChildrenCount(parent);
\n for (int i = 0; i < childCount; i++)
\n {
\n var child = VisualTreeHelper.GetChild(parent, i);
\n var result = FindScrollViewer(child);
\n if (result != null) return result;
\n }
\n return null;
\n }
\n #endregion<\/p>\n
#region \u63a7\u4ef6\u751f\u547d\u5468\u671f\u4e8b\u4ef6
\n private void Host_Loaded(object sender, RoutedEventArgs e)
\n {
\n _scrollViewer = FindScrollViewer(this);
\n if (_scrollViewer != null)
\n _scrollViewer.ScrollChanged += ScrollViewer_ScrollChanged;<\/p>\n
CalcPageSize();
\n Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(Reset));
\n }<\/p>\n
private void Host_Unloaded(object sender, RoutedEventArgs e)
\n {
\n if (_scrollViewer != null)
\n _scrollViewer.ScrollChanged -= ScrollViewer_ScrollChanged;
\n }<\/p>\n
private void Host_SizeChanged(object sender, SizeChangedEventArgs e)
\n {
\n CalcPageSize();
\n Reset();
\n }<\/p>\n
private void Generator_StatusChanged(object sender, EventArgs e)
\n {
\n var gen = sender as ItemContainerGenerator;
\n if (gen == null || gen.Status != GeneratorStatus.ContainersGenerated)
\n return;
\n if (_lazyCtx == null || _lazyCtx.MeasuredRowHeight > 0)
\n return;<\/p>\n
\/\/ \u81ea\u52a8\u6d4b\u91cf\u9996\u884c\u9ad8\u5ea6
\n var firstRow = gen.ContainerFromIndex(0) as DataGridRow;
\n if (firstRow == null) return;<\/p>\n
double rowHeight = firstRow.ActualHeight;
\n if (rowHeight > 0)
\n {
\n _lazyCtx.MeasuredRowHeight = rowHeight;
\n CalcPageSize();
\n Reset();
\n }
\n }
\n #endregion<\/p>\n
#region \u52a8\u6001\u8ba1\u7b97\u5206\u9875\u5927\u5c0f
\n private void CalcPageSize()
\n {
\n double preload = PreloadScreen;
\n double rowHeight = _lazyCtx.MeasuredRowHeight > 0 ? _lazyCtx.MeasuredRowHeight : 30;<\/p>\n
if (_scrollViewer == null || _scrollViewer.ViewportHeight <= 0)
\n {
\n _lazyCtx.PageSize = 20;
\n return;
\n }
\n \/\/ \u6839\u636e\u89c6\u53e3\u9ad8\u5ea6\u52a8\u6001\u8ba1\u7b97\u5355\u9875\u6570\u636e\u91cf
\n int oneScreen = (int)Math.Ceiling(_scrollViewer.ViewportHeight \/ rowHeight);
\n _lazyCtx.PageSize = (int)Math.Ceiling(oneScreen * preload);
\n }
\n #endregion<\/p>\n
#region \u52a0\u8f7d\u4e0b\u4e00\u9875\u6570\u636e
\n private void LoadNextPage()
\n {
\n if (_lazyCtx.IsLoading) return;
\n IList source = AllItems;
\n var visible = VisibleItems;
\n if (source == null || visible == null || _lazyCtx.LoadedItemIndex >= source.Count)
\n return;<\/p>\n
_lazyCtx.IsLoading = true;
\n try
\n {
\n int take = Math.Min(_lazyCtx.PageSize, source.Count – _lazyCtx.LoadedItemIndex);
\n for (int i = 0; i < take; i++)
\n {
\n visible.Add(source[_lazyCtx.LoadedItemIndex + i]);
\n }
\n _lazyCtx.LoadedItemIndex += take;
\n }
\n finally
\n {
\n _lazyCtx.IsLoading = false;
\n }
\n }
\n #endregion<\/p>\n
#region \u6eda\u52a8\u9884\u52a0\u8f7d\u903b\u8f91
\n private void ScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
\n {
\n if (_lazyCtx == null || _lazyCtx.IsLoading) return;
\n CalcPageSize();<\/p>\n
IList source = AllItems;
\n if (source == null || _lazyCtx.LoadedItemIndex >= source.Count) return;<\/p>\n
double rowHeight = _lazyCtx.MeasuredRowHeight > 0 ? _lazyCtx.MeasuredRowHeight : 30;
\n double remain = _scrollViewer.ExtentHeight – (_scrollViewer.VerticalOffset + _scrollViewer.ViewportHeight);
\n \/\/ \u8ddd\u79bb\u5e95\u90e8\u5c0f\u4e8e\u534a\u884c\u9ad8\u5ea6，\u89e6\u53d1\u9884\u52a0\u8f7d
\n if (remain < rowHeight * 0.5)
\n {
\n LoadNextPage();
\n }
\n }
\n #endregion<\/p>\n
#region \u5bf9\u5916\u516c\u5f00\u91cd\u7f6e\u65b9\u6cd5
\n public void Reset()
\n {
\n if (_lazyCtx == null || VisibleItems == null) return;
\n IList source = AllItems;
\n if (source == null) return;<\/p>\n
VisibleItems.Clear();
\n _lazyCtx.LoadedItemIndex = 0;
\n _lazyCtx.IsLoading = false;
\n LoadNextPage();
\n }
\n #endregion
\n }
\n}<\/p>\n
6.4 LazyListBox \u5b8c\u6574\u6e90\u7801<\/h4>\n
using System;
\nusing System.Collections;
\nusing System.Collections.ObjectModel;
\nusing System.Windows;
\nusing System.Windows.Controls;
\nusing System.Windows.Media;<\/p>\n
namespace WpfAttachedLazyLoad
\n{
\n public class LazyListBox : ListBox
\n {
\n #region DependencyProperties
\n public static readonly DependencyProperty IsEnabledProperty =
\n DependencyProperty.Register(
\n nameof(IsEnabled),
\n typeof(bool),
\n typeof(LazyListBox),
\n new PropertyMetadata(false, OnIsEnabledChanged));<\/p>\n
public bool IsEnabled
\n {
\n get => (bool)GetValue(IsEnabledProperty);
\n set => SetValue(IsEnabledProperty, value);
\n }<\/p>\n
public static readonly DependencyProperty PreloadScreenProperty =
\n DependencyProperty.Register(
\n nameof(PreloadScreen),
\n typeof(double),
\n typeof(LazyListBox),
\n new PropertyMetadata(1.2));<\/p>\n
public double PreloadScreen
\n {
\n get => (double)GetValue(PreloadScreenProperty);
\n set => SetValue(PreloadScreenProperty, value);
\n }<\/p>\n
\/\/\/ <summary>\u5b8c\u6574\u539f\u59cb\u6570\u636e\u6e90，ViewModel\u7ed1\u5b9a\u5165\u53e3<\/summary>
\n public static readonly DependencyProperty AllItemsProperty =
\n DependencyProperty.Register(
\n nameof(AllItems),
\n typeof(IList),
\n typeof(LazyListBox),
\n new PropertyMetadata(null, OnAllItemsChanged));<\/p>\n
public IList AllItems
\n {
\n get => (IList)GetValue(AllItemsProperty);
\n set => SetValue(AllItemsProperty, value);
\n }<\/p>\n
\/\/\/ <summary>\u5185\u90e8\u53ef\u89c6\u5b50\u96c6，\u771f\u6b63\u7ed1\u5b9a\u5230ItemsSource\u7528\u4e8e\u6e32\u67d3<\/summary>
\n private static readonly DependencyProperty VisibleItemsProperty =
\n DependencyProperty.Register(
\n nameof(VisibleItems),
\n typeof(ObservableCollection<object>),
\n typeof(LazyListBox),
\n new PropertyMetadata(null));<\/p>\n
private ObservableCollection<object> VisibleItems
\n {
\n get => (ObservableCollection<object>)GetValue(VisibleItemsProperty);
\n set => SetValue(VisibleItemsProperty, value);
\n }
\n #endregion<\/p>\n
#region Private Fields & \u4e0a\u4e0b\u6587
\n private LazyLoadContext _lazyCtx;
\n private ScrollViewer _scrollViewer;<\/p>\n
\/\/\/ <summary>\u61d2\u52a0\u8f7d\u4e0a\u4e0b\u6587\u7f13\u5b58<\/summary>
\n private class LazyLoadContext
\n {
\n public int PageSize { get; set; }
\n public int LoadedItemIndex { get; set; }
\n public bool IsLoading { get; set; }
\n public double MeasuredItemHeight { get; set; }
\n }
\n #endregion<\/p>\n
#region \u4f9d\u8d56\u5c5e\u6027\u53d8\u66f4\u56de\u8c03
\n private static void OnIsEnabledChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
\n {
\n var listBox = d as LazyListBox;
\n bool enable = (bool)e.NewValue;
\n if (enable)
\n listBox.AttachLazy();
\n else
\n listBox.DetachLazy();
\n }<\/p>\n
private static void OnAllItemsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
\n {
\n var listBox = d as LazyListBox;
\n if (!listBox.IsEnabled) return;
\n \/\/ \u6570\u636e\u6e90\u6574\u4f53\u66ff\u6362，\u81ea\u52a8\u91cd\u7f6e\u5206\u9875
\n listBox.Reset();
\n }
\n #endregion<\/p>\n
#region \u61d2\u52a0\u8f7d\u6302\u8f7d\/\u5378\u8f7d\u751f\u547d\u5468\u671f
\n private void AttachLazy()
\n {
\n if (_lazyCtx != null) return;<\/p>\n
_lazyCtx = new LazyLoadContext();
\n VisibleItems = new ObservableCollection<object>();
\n ItemsSource = VisibleItems;<\/p>\n
\/\/ \u7ed1\u5b9a\u751f\u547d\u5468\u671f\u4e8b\u4ef6
\n Loaded += Host_Loaded;
\n Unloaded += Host_Unloaded;
\n SizeChanged += Host_SizeChanged;
\n ItemContainerGenerator.StatusChanged += Generator_StatusChanged;
\n }<\/p>\n
private void DetachLazy()
\n {
\n \/\/ \u89e3\u7ed1\u6eda\u52a8\u4e8b\u4ef6，\u9632\u6b62\u5185\u5b58\u6cc4\u6f0f
\n if (_scrollViewer != null)
\n {
\n _scrollViewer.ScrollChanged -= ScrollViewer_ScrollChanged;
\n _scrollViewer = null;
\n }<\/p>\n
\/\/ \u89e3\u7ed1\u6240\u6709\u751f\u547d\u5468\u671f\u4e8b\u4ef6
\n Loaded -= Host_Loaded;
\n Unloaded -= Host_Unloaded;
\n SizeChanged -= Host_SizeChanged;
\n ItemContainerGenerator.StatusChanged -= Generator_StatusChanged;<\/p>\n
_lazyCtx = null;
\n VisibleItems = null;
\n ItemsSource = null;
\n }
\n #endregion<\/p>\n
#region \u9012\u5f52\u67e5\u627e\u5185\u90e8ScrollViewer
\n private ScrollViewer FindScrollViewer(DependencyObject parent)
\n {
\n if (parent == null) return null;
\n if (parent is ScrollViewer sv) return sv;<\/p>\n
int childCount = VisualTreeHelper.GetChildrenCount(parent);
\n for (int i = 0; i < childCount; i++)
\n {
\n var child = VisualTreeHelper.GetChild(parent, i);
\n var result = FindScrollViewer(child);
\n if (result != null) return result;
\n }
\n return null;
\n }
\n #endregion<\/p>\n
#region \u63a7\u4ef6\u751f\u547d\u5468\u671f\u4e8b\u4ef6
\n private void Host_Loaded(object sender, RoutedEventArgs e)
\n {
\n _scrollViewer = FindScrollViewer(this);
\n if (_scrollViewer != null)
\n _scrollViewer.ScrollChanged += ScrollViewer_ScrollChanged;<\/p>\n
CalcPageSize();
\n Dispatcher.BeginInvoke(DispatcherPriority.Loaded, new Action(Reset));
\n }<\/p>\n
private void Host_Unloaded(object sender, RoutedEventArgs e)
\n {
\n if (_scrollViewer != null)
\n _scrollViewer.ScrollChanged -= ScrollViewer_ScrollChanged;
\n }<\/p>\n
private void Host_SizeChanged(object sender, SizeChangedEventArgs e)
\n {
\n CalcPageSize();
\n Reset();
\n }<\/p>\n
private void Generator_StatusChanged(object sender, EventArgs e)
\n {
\n var gen = sender as ItemContainerGenerator;
\n if (gen == null || gen.Status != GeneratorStatus.ContainersGenerated)
\n return;
\n if (_lazyCtx == null || _lazyCtx.MeasuredItemHeight > 0)
\n return;<\/p>\n
\/\/ \u81ea\u52a8\u6d4b\u91cf\u9996\u9879\u9ad8\u5ea6
\n var firstItem = gen.ContainerFromIndex(0) as ListBoxItem;
\n if (firstItem == null) return;<\/p>\n
double itemHeight = firstItem.ActualHeight;
\n if (itemHeight > 0)
\n {
\n _lazyCtx.MeasuredItemHeight = itemHeight;
\n CalcPageSize();
\n Reset();
\n }
\n }
\n #endregion<\/p>\n
#region \u52a8\u6001\u8ba1\u7b97\u5206\u9875\u5927\u5c0f
\n private void CalcPageSize()
\n {
\n double preload = PreloadScreen;
\n double itemHeight = _lazyCtx.MeasuredItemHeight > 0 ? _lazyCtx.MeasuredItemHeight : 30;<\/p>\n
if (_scrollViewer == null || _scrollViewer.ViewportHeight <= 0)
\n {
\n _lazyCtx.PageSize = 20;
\n return;
\n }
\n \/\/ \u6839\u636e\u89c6\u53e3\u9ad8\u5ea6\u52a8\u6001\u8ba1\u7b97\u5355\u9875\u6570\u636e\u91cf
\n int oneScreen = (int)Math.Ceiling(_scrollViewer.ViewportHeight \/ itemHeight);
\n _lazyCtx.PageSize = (int)Math.Ceiling(oneScreen * preload);
\n }
\n #endregion<\/p>\n
#region \u52a0\u8f7d\u4e0b\u4e00\u9875\u6570\u636e
\n private void LoadNextPage()
\n {
\n if (_lazyCtx.IsLoading) return;
\n IList source = AllItems;
\n var visible = VisibleItems;
\n if (source == null || visible == null || _lazyCtx.LoadedItemIndex >= source.Count)
\n return;<\/p>\n
_lazyCtx.IsLoading = true;
\n try
\n {
\n int take = Math.Min(_lazyCtx.PageSize, source.Count – _lazyCtx.LoadedItemIndex);
\n for (int i = 0; i < take; i++)
\n {
\n visible.Add(source[_lazyCtx.LoadedItemIndex + i]);
\n }
\n _lazyCtx.LoadedItemIndex += take;
\n }
\n finally
\n {
\n _lazyCtx.IsLoading = false;
\n }
\n }
\n #endregion<\/p>\n
#region \u6eda\u52a8\u9884\u52a0\u8f7d\u903b\u8f91
\n private void ScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
\n {
\n if (_lazyCtx == null || _lazyCtx.IsLoading) return;
\n CalcPageSize();<\/p>\n
IList source = AllItems;
\n if (source == null || _lazyCtx.LoadedItemIndex >= source.Count) return;<\/p>\n
double itemHeight = _lazyCtx.MeasuredItemHeight > 0 ? _lazyCtx.MeasuredItemHeight : 30;
\n double remain = _scrollViewer.ExtentHeight – (_scrollViewer.VerticalOffset + _scrollViewer.ViewportHeight);
\n \/\/ \u8ddd\u79bb\u5e95\u90e8\u5c0f\u4e8e\u534a\u884c\u9ad8\u5ea6，\u89e6\u53d1\u9884\u52a0\u8f7d
\n if (remain < itemHeight * 0.5)
\n {
\n LoadNextPage();
\n }
\n }
\n #endregion<\/p>\n
#region \u5bf9\u5916\u516c\u5f00\u91cd\u7f6e\u65b9\u6cd5
\n public void Reset()
\n {
\n if (_lazyCtx == null || VisibleItems == null) return;
\n IList source = AllItems;
\n if (source == null) return;<\/p>\n
VisibleItems.Clear();
\n _lazyCtx.LoadedItemIndex = 0;
\n _lazyCtx.IsLoading = false;
\n LoadNextPage();
\n }
\n #endregion
\n }
\n}<\/p>\n
\u4e03\u3001XAML \u4f7f\u7528\u793a\u4f8b<\/h3>\n7.1 LazyDataGrid \u8868\u683c\u7528\u6cd5<\/h4>\n
<local:LazyDataGrid AutoGenerateColumns="False"
\n IsEnabled="True"
\n PreloadScreen="1.2"
\n AllItems="{Binding Items}">
\n <local:LazyDataGrid.Columns>
\n <DataGridTextColumn Header="\u7f16\u53f7" Binding="{Binding Id}"\/>
\n <DataGridTextColumn Header="\u6570\u636e\u540d\u79f0" Binding="{Binding Name}"\/>
\n <\/local:LazyDataGrid.Columns>
\n<\/local:LazyDataGrid><\/p>\n
7.2 LazyListBox \u5217\u8868\u7528\u6cd5<\/h4>\n
<local:LazyListBox IsEnabled="True"
\n PreloadScreen="1.2"
\n AllItems="{Binding Items}">
\n <local:LazyListBox.ItemTemplate>
\n <DataTemplate>
\n <TextBlock Text="{Binding Name}" Margin="6,4" FontSize="14"\/>
\n <\/DataTemplate>
\n <\/local:LazyListBox.ItemTemplate>
\n<\/local:LazyListBox><\/p>\n
\u516b\u3001\u7a97\u53e3\u6d4b\u8bd5\u540e\u53f0\u4ee3\u7801<\/h3>\n
using System;
\nusing System.Collections.Generic;
\nusing System.Collections.ObjectModel;
\nusing System.Windows;<\/p>\n
namespace WpfAttachedLazyLoad
\n{
\n public partial class MainWindow : Window
\n {
\n public LazyListViewModel Vm { get; set; } = new LazyListViewModel();<\/p>\n
public MainWindow()
\n {
\n InitializeComponent();
\n DataContext = Vm;
\n \/\/ \u521d\u59cb\u5316\u5341\u4e07\u6761\u6d4b\u8bd5\u5927\u6570\u636e
\n LoadFirstBigData();
\n }<\/p>\n
\/\/\/ <summary>
\n \/\/\/ \u9996\u6b21\u52a0\u8f7d\u5341\u4e07\u6761\u6d4b\u8bd5\u6570\u636e
\n \/\/\/ <\/summary>
\n private void LoadFirstBigData()
\n {
\n var list = new List<ItemModel>();
\n for (int i = 1; i <= 100000; i++)
\n {
\n list.Add(new ItemModel { Id = i, Name = $"\u6d4b\u8bd5\u6570\u636e_{i}" });
\n }
\n Vm.Items = new ObservableCollection<ItemModel>(list);
\n }<\/p>\n
\/\/\/ <summary>
\n \/\/\/ \u52a8\u6001\u5237\u65b0\u66ff\u6362\u6570\u636e\u6e90（\u63a7\u4ef6\u81ea\u52a8\u91cd\u7f6e，\u65e0\u9700\u624b\u52a8\u7f16\u7801）
\n \/\/\/ <\/summary>
\n private void Btn_Refresh_Click(object sender, RoutedEventArgs e)
\n {
\n var newList = new List<ItemModel>();
\n for (int i = 2000; i <= 80000; i++)
\n {
\n newList.Add(new ItemModel { Id = i, Name = $"\u5237\u65b0\u540e\u6570\u636e_{i}" });
\n }
\n Vm.Items = new ObservableCollection<ItemModel>(newList);
\n }
\n }
\n}<\/p>\n
\u4e5d\u3001\u5173\u952e\u6280\u672f\u603b\u7ed3 & \u907f\u5751\u6e05\u5355<\/h3>\n1. \u5f7b\u5e95\u653e\u5f03\u9644\u52a0\u5c5e\u6027\u7684\u539f\u56e0<\/h4>\n
\u9644\u52a0\u5c5e\u6027\u7ed1\u5b9a\u5728\u66ff\u6362\u6570\u636e\u6e90\u96c6\u5408\u573a\u666f\u4e0b\u5b58\u5728\u539f\u751f\u901a\u77e5\u4e22\u5931\u95ee\u9898，\u5c5e\u4e8eWPF\u5e95\u5c42\u56fa\u6709\u7f3a\u9677，\u65e0\u6cd5\u901a\u8fc7\u4e1a\u52a1\u4ee3\u7801\u4fee\u590d，\u4f1a\u5bfc\u81f4\u4e8c\u6b21\u5237\u65b0\u754c\u9762\u65e0\u54cd\u5e94\u3002<\/p>\n
2. \u5f7b\u5e95\u653e\u5f03Behavior\u7684\u539f\u56e0<\/h4>\n
Behavior\u5c5e\u4e8eFreezable\u975eUI\u5bf9\u8c61，\u4e0d\u5728\u53ef\u89c6\u5316\u6811\u4e2d，\u4f9d\u8d56\u5c5e\u6027\u7684\u66f4\u65b0\u673a\u5236\u4e0e\u539f\u751f\u63a7\u4ef6\u4e0d\u4e00\u81f4，\u6570\u636e\u6e90\u4e8c\u6b21\u66ff\u6362\u5fc5\u7136\u5237\u65b0\u5931\u6548，\u7a33\u5b9a\u6027\u65e0\u6cd5\u4fdd\u969c\u3002<\/p>\n
3. \u81ea\u5b9a\u4e49\u7ee7\u627f\u63a7\u4ef6\u65b9\u6848\u7684\u6838\u5fc3\u4f18\u52bf<\/h4>\n
\u76f4\u63a5\u7ee7\u627f\u539f\u751fDataGrid\u3001ListBox\u5b9e\u73b0\u7684\u81ea\u5b9a\u4e49\u63a7\u4ef6，\u5b8c\u5168\u9075\u5faaWPF\u6807\u51c6\u7ed1\u5b9a\u673a\u5236，\u5c5e\u6027\u53d8\u66f4\u3001\u6570\u636e\u6e90\u66ff\u6362\u3001\u591a\u8f6e\u5237\u65b0\u5747\u7a33\u5b9a\u89e6\u53d1\u56de\u8c03，\u5f7b\u5e95\u6839\u6cbb\u7ed1\u5b9a\u5931\u6548\u95ee\u9898\u3002<\/p>\n
4. \u63a7\u4ef6\u80fd\u529b\u8fb9\u754c\u8bf4\u660e<\/h4>\n
\u5f53\u524d\u7248\u672c\u4e3a\u5355\u5411\u5411\u4e0b\u61d2\u52a0\u8f7d（\u6eda\u52a8\u5230\u5e95\u90e8\u7eed\u9875），\u53ef\u6ee1\u8db390%\u4ee5\u4e0a\u684c\u9762\u4e1a\u52a1\u5927\u6570\u636e\u5217\u8868\u573a\u666f\u3002\u5982\u9700\u53cc\u5411\u865a\u62df\u6eda\u52a8（\u4e0a\u4e0b\u6eda\u52a8\u6309\u9700\u52a0\u8f7d\u533a\u95f4\u6570\u636e），\u53ef\u57fa\u4e8e\u73b0\u6709\u67b6\u6784\u4e8c\u6b21\u6269\u5c55\u3002<\/p>\n
\u5341\u3001\u7ed3\u8bed<\/h3>\n
\u8fd9\u5957 LazyDataGrid \/ LazyListBox \u662f\u7ecf\u8fc7\u591a\u8f6e\u8e29\u5751\u3001\u67b6\u6784\u8fed\u4ee3\u540e\u7684\u5de5\u4e1a\u7ea7\u7a33\u5b9a\u65b9\u6848：<\/p>\n
\n- \n
\u5f7b\u5e95\u89e3\u51b3 WPF \u5927\u6570\u636e\u5217\u8868\u6e32\u67d3\u5361\u987f\u3001UI\u5361\u6b7b\u95ee\u9898<\/p>\n<\/li>\n
- \n
\u5f7b\u5e95\u89e3\u51b3\u884c\u4e1a\u901a\u7528\u7684\u63a7\u4ef6\u4e8c\u6b21\u5237\u65b0\u4e0d\u66f4\u65b0\u7684\u7ed1\u5b9a\u7384\u5b66\u95ee\u9898<\/p>\n<\/li>\n
- \n
\u7eaf\u89c6\u56fe\u5c42\u4f18\u5316，\u96f6\u4fb5\u5165ViewModel，\u8d34\u5408MVVM\u67b6\u6784<\/p>\n<\/li>\n
- \n
\u65e0\u7b2c\u4e09\u65b9\u4f9d\u8d56\u3001\u65e0\u5185\u5b58\u6cc4\u6f0f，\u53ef\u76f4\u63a5\u590d\u7528\u81f3\u6240\u6709WPF\u9879\u76ee<\/p>\n<\/li>\n<\/ul>\n
\u540e\u7eed\u9879\u76ee\u4e2d\u6240\u6709\u5927\u6570\u636e\u8868\u683c\u3001\u5927\u6570\u636e\u5217\u8868\u573a\u666f，\u53ef\u7edf\u4e00\u66ff\u6362\u4e3a\u672c\u5957\u61d2\u52a0\u8f7d\u63a7\u4ef6，\u5b9e\u73b0\u9879\u76ee\u5168\u5c40UI\u6027\u80fd\u6807\u51c6\u5316\u4f18\u5316\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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WPF \u9ad8\u6027\u80fd\u61d2\u52a0\u8f7d\u63a7\u4ef6 LazyDataGrid \/ LazyListBox \u5b9e\u73b0\u4e0e\u8e29\u5751\u5168\u590d\u76d8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/108154.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"WPF \u9ad8\u6027\u80fd\u61d2\u52a0\u8f7d\u63a7\u4ef6 LazyDataGrid \/ LazyListBox \u5b9e\u73b0\u4e0e\u8e29\u5751\u5168\u590d\u76d8 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u4e00\u3001\u524d\u8a00：WPF \u5927\u6570\u636e\u5217\u8868\u7684\u901a\u7528\u75db\u70b9\u5728 WPF \u9879\u76ee\u4e2d，\u76f4\u63a5\u7ed9 DataGrid \/ ListBox \u7ed1\u5b9a\u51e0\u4e07\u3001\u5341\u51e0\u4e07\u6761\u6570\u636e，\u4f1a\u51fa\u73b0\u4e25\u91cd\u95ee\u9898：UI \u5361\u6b7b\u3001\u9996\u6b21\u6e32\u67d3\u6781\u6162\u63a7\u4ef6\u521d\u59cb\u5316\u963b\u585e\u3001\u7a97\u53e3\u5361\u987f\u539f\u751f\u865a\u62df\u5316\u5728\u590d\u6742\u6a21\u677f\u3001\u5206\u7ec4\u3001\u5217\u81ea\u9002\u5e94\u573a\u666f\u4e0b\u5931\u6548\u4e1a\u52a1\u5c42\u9700\u8981\u5168\u91cf\u52a0\u8f7d\u6570\u636e，\u65e0\u6cd5\u505a\u5230\u6eda\u52a8\u6309\u9700\u6e32\u67d3\u884c\u4e1a\u5e38\u89c4\u65b9\u6848：\u524d\u7aef\u5206\u9875 \/ \u540e\u7aef\u5206\u9875，\u4f46\u5f88\u591a\u684c\u9762\u7aef\u4e1a\u52a1\u9700\u8981\u5168\u91cf\u62ff\u5230\u5185\u5b58\u3001\u524d\u7aef\u6eda\u52a8\u61d2\u52a0\u8f7d\u3002\u4e3a\u6b64\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/108154.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-09-20T17:13:27+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"10 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/108154.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/108154.html\",\"name\":\"WPF \u9ad8\u6027\u80fd\u61d2\u52a0\u8f7d\u63a7\u4ef6 LazyDataGrid \/ LazyListBox \u5b9e\u73b0\u4e0e\u8e29\u5751\u5168\u590d\u76d8 - 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