我们有一个简单的 WPF 演示应用程序，它有 1000 行和 32 列(代码见下文)。
除了禁用虚拟化之外，我们没有做任何特别的事情，我们的用户需要这样做，否则滚动太慢(他们整天在大型数据集上这样做，因此响应性/敏捷性对他们来说很重要)。
我们遇到的问题是，如果您单击其中一个标题对数据进行排序，这将需要大约 20 秒(此处为 2x3GHz Core 2 Duo 机器)。有什么办法可以加快这个速度吗？
排序的时候好像是在重构整个视觉树，似乎没有必要。任何有关如何加速这种特定情况的指针都将受到赞赏，即使它可以编译我们自己的网格版本。
谢谢。
<Window x:Class="WpfGridTest1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525">
<Grid>
<DataGrid Name="dataGrid" VirtualizingStackPanel.IsVirtualizing="False">
</DataGrid>
</Grid>
</Window>
using System.Collections.Generic;
namespace WpfGridTest1
{
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
List<Row> rows = new List<Row>();
for (int i = 0; i < 1000; i++)
{
Row row = new Row
{
Column0 = i,
Column1 = i,
Column2 = i,
Column3 = i,
Column4 = i,
Column5 = i,
Column6 = i,
Column7 = i,
Column8 = i,
Column9 = i,
Column10 = i,
Column11 = i,
Column12 = i,
Column13 = i,
Column14 = i,
Column15 = i,
Column16 = i,
Column17 = i,
Column18 = i,
Column19 = i,
Column20 = i,
Column21 = i,
Column22 = i,
Column23 = i,
Column24 = i,
Column25 = i,
Column26 = i,
Column27 = i,
Column28 = i,
Column29 = i,
Column30 = i,
Column31 = i
};
rows.Add(row);
}
dataGrid.ItemsSource = rows;
}
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
namespace WpfGridTest1
{
class Row : INotifyPropertyChanged
{
private double column0 ;
private double column1 ;
private double column2 ;
private double column3 ;
private double column4 ;
private double column5 ;
private double column6 ;
private double column7 ;
private double column8 ;
private double column9 ;
private double column10;
private double column11;
private double column12;
private double column13;
private double column14;
private double column15;
private double column16;
private double column17;
private double column18;
private double column19;
private double column20;
private double column21;
private double column22;
private double column23;
private double column24;
private double column25;
private double column26;
private double column27;
private double column28;
private double column29;
private double column30;
private double column31;
public double Column0 { get { return column0 ; } set { column0 = value; NotifyPropertyChanged("Column0 "); } }
public double Column1 { get { return column1 ; } set { column1 = value; NotifyPropertyChanged("Column1 "); } }
public double Column2 { get { return column2 ; } set { column2 = value; NotifyPropertyChanged("Column2 "); } }
public double Column3 { get { return column3 ; } set { column3 = value; NotifyPropertyChanged("Column3 "); } }
public double Column4 { get { return column4 ; } set { column4 = value; NotifyPropertyChanged("Column4 "); } }
public double Column5 { get { return column5 ; } set { column5 = value; NotifyPropertyChanged("Column5 "); } }
public double Column6 { get { return column6 ; } set { column6 = value; NotifyPropertyChanged("Column6 "); } }
public double Column7 { get { return column7 ; } set { column7 = value; NotifyPropertyChanged("Column7 "); } }
public double Column8 { get { return column8 ; } set { column8 = value; NotifyPropertyChanged("Column8 "); } }
public double Column9 { get { return column9 ; } set { column9 = value; NotifyPropertyChanged("Column9 "); } }
public double Column10 { get { return column10; } set { column10 = value; NotifyPropertyChanged("Column10"); } }
public double Column11 { get { return column11; } set { column11 = value; NotifyPropertyChanged("Column11"); } }
public double Column12 { get { return column12; } set { column12 = value; NotifyPropertyChanged("Column12"); } }
public double Column13 { get { return column13; } set { column13 = value; NotifyPropertyChanged("Column13"); } }
public double Column14 { get { return column14; } set { column14 = value; NotifyPropertyChanged("Column14"); } }
public double Column15 { get { return column15; } set { column15 = value; NotifyPropertyChanged("Column15"); } }
public double Column16 { get { return column16; } set { column16 = value; NotifyPropertyChanged("Column16"); } }
public double Column17 { get { return column17; } set { column17 = value; NotifyPropertyChanged("Column17"); } }
public double Column18 { get { return column18; } set { column18 = value; NotifyPropertyChanged("Column18"); } }
public double Column19 { get { return column19; } set { column19 = value; NotifyPropertyChanged("Column19"); } }
public double Column20 { get { return column20; } set { column20 = value; NotifyPropertyChanged("Column20"); } }
public double Column21 { get { return column21; } set { column21 = value; NotifyPropertyChanged("Column21"); } }
public double Column22 { get { return column22; } set { column22 = value; NotifyPropertyChanged("Column22"); } }
public double Column23 { get { return column23; } set { column23 = value; NotifyPropertyChanged("Column23"); } }
public double Column24 { get { return column24; } set { column24 = value; NotifyPropertyChanged("Column24"); } }
public double Column25 { get { return column25; } set { column25 = value; NotifyPropertyChanged("Column25"); } }
public double Column26 { get { return column26; } set { column26 = value; NotifyPropertyChanged("Column26"); } }
public double Column27 { get { return column27; } set { column27 = value; NotifyPropertyChanged("Column27"); } }
public double Column28 { get { return column28; } set { column28 = value; NotifyPropertyChanged("Column28"); } }
public double Column29 { get { return column29; } set { column29 = value; NotifyPropertyChanged("Column29"); } }
public double Column30 { get { return column30; } set { column30 = value; NotifyPropertyChanged("Column30"); } }
public double Column31 { get { return column31; } set { column31 = value; NotifyPropertyChanged("Column31"); } }
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(String info)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(info));
}
}
}
}
更新:我已经尝试过 AngelWPF 的建议如下:
private void dataGrid_Sorting(object sender, System.Windows.Controls.DataGridSortingEventArgs e)
{
e.Handled = true;
IQueryable<Row> iqueryable = _rows.AsQueryable();
var v = iqueryable.OrderBy(row => row.Column0);
foreach (Row row in v)
System.Diagnostics.Debug.WriteLine("Row " + row.Column0);
_rows = new ObservableCollection<Row>(v.ToList());
dataGrid.ItemsSource = _rows;
}
尽管性能问题仍然存在，因为它正在重建网格。
最佳答案
没有虚拟化，排序性能就没有机会提升!
为什么要放松虚拟化？可以解决数据网格滚动缓慢的问题...像这些帖子可能会有所帮助... WPF Datagrid Performance , Slow and Stuttery WPF Grid Scrolling when loaded with large amounts of data (40 columns, 2000 rows) , http://www.codeproject.com/KB/WPF/WpfDataVirtualization.aspx .
话虽如此，有一种方法可以改进非虚拟化数据网格的排序。
DataGrid.Sorting事件和设置e.Handled = true在它的处理程序中。这样datagrid不会执行排序。 ItemsSource 的最快方法的数据网格。 ItemsSource . 我们为一个只读的非虚拟化数据网格尝试了上述方法，它显示了各种颜色、效果和 30000 行 30 列，结果令人震惊。
可查询的 LINQ 可以创造奇迹!
关于wpf - 在没有虚拟化的情况下在 WPF DataGrid 上排序时性能不佳，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7399785/