DataGrid数据绑定属性Get调用过多

我们在绑定到对象集合的窗口上有一个数据网格。我们在这个窗口上的性能非常差;加载最多需要20秒,然后每次“滚动”数据网格需要5-7秒。到目前为止一共有12项。当我们调查时,似乎导致增长放缓的主要原因是属性getter;我们的一些getter被调用了20000次以上(即每个对象1666.667次)!仪器显示我们的吸气剂不是 尤其 慢;最慢的花了0.002秒。不幸的是,当你乘以0.0002*20k,你很容易得到我们正在经历的延迟。

在这个概念证明的例子中,这不是一个问题;但是我们的实际对象要复杂得多,我们不能承受40秒的延迟来访问一个属性20000次!有人知道这是怎么回事吗?我怎样才能让网格不那么积极地轮询我的对象呢?我们正在使用WPF工具包DataGrid和.NET版本3.5。PoC的示例代码如下:

*****窗口代码*****

<Window x:Class="PocApp.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:WpfToolkit="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit"
    Title="Window1" Height="200" Width="200">
    <Grid>
        <WpfToolkit:DataGrid ItemsSource="{Binding Path=MyEntries}">

        </WpfToolkit:DataGrid>
    </Grid>
</Window>

*****窗口代码隐藏*****

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 PocApp
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            this.DataContext = new EntryViewModel();
        }
    }
}

*****入门级*****

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

namespace PocApp
{
    public class Entry
    {
        public Entry(string first, string last)
        {
            FirstName = first;
            LastName = last;
        }

        public string FirstName
        {
            get
            {
                firstCall++;
                System.Console.WriteLine("FirstName Call:" + firstCall);
                return _firstname;
            }
            set
            {
                _firstname = value;
            }
        }
        public int FirstNameCallCount
        {
            get
            {
                return firstCall;
            }
        }
        public string LastName
        {
            get
            {
                lastCall++;
                System.Console.WriteLine("LastName Call:" + lastCall);
                return _lastname;
            }
            set
            {
                _lastname = value;
            }
        }
        public int LastNameCallCount
        {
            get
            {
                return lastCall;
            }
        }
        private string _firstname,_lastname;
        private int firstCall,lastCall  = 0;
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;

namespace PocApp
{
    public class EntryViewModel
    {
        public EntryViewModel()
        {
            List<Entry> myCoolEntries = new List<Entry>()
            {
                new Entry("A","A1"),
                new Entry("B","B1"),
                new Entry("C","C1"),
                new Entry("D","D1"),
                new Entry("E","E1"),
                new Entry("F","F1"),
                new Entry("G","G1"),
                new Entry("H","H1"),
                new Entry("I","I1"),
                new Entry("J","J1"),
                new Entry("K","K1"),
                new Entry("L","L1"),
                new Entry("M","M1"),
                new Entry("N","N1"),
                new Entry("O","O1"),
                new Entry("P","P1"),
                new Entry("Q","Q1"),
            };
            MyEntries = (CollectionView)CollectionViewSource.GetDefaultView(myCoolEntries);
        }
        public CollectionView MyEntries
        {
            get;
            private set;
        }
    }
}