public class Test
{
public Test() { }
public int Id { get; set; }
public string TName { get; set; }
public bool IsComplete { get; set; }
public string Remark { get; set; }
public override bool Equals(object obj)
{
if (this == obj) return true;
if (obj == null || this.GetType() != obj.GetType())
{
return false;
}
Test t = (Test)obj;
return ((this.Id == t.Id) && (this.TName == t.TName)
&& (this.Remark == t.Remark)
&& (this.IsComplete == t.IsComplete)
);
}
public override int GetHashCode()
{
int HashCodeId = this.Id;
int HashCodeTName = this.TName == null ? 0 : this.TName.GetHashCode();
int HashCodeRemark = this.Remark == null ? 0 : this.Remark.GetHashCode();
int HashCodeIsComplete = this.IsComplete.GetHashCode();
return HashCodeId ^ HashCodeTName ^ HashCodeRemark ^ HashCodeIsComplete;
}
}
<Window x:Class="WpfApplication1.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>
<Button Content="获取数据1" Height="23" HorizontalAlignment="Left" Margin="12,38,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
<Button Content="获取数据2" Height="23" HorizontalAlignment="Left" Margin="12,82,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" />
<ListBox Name="lstTestData" Height="177" HorizontalAlignment="Left" Margin="127,38,0,0" VerticalAlignment="Top" Width="120"
DisplayMemberPath="TName"/>
<GroupBox Header="详细信息" Height="176" HorizontalAlignment="Left" Margin="288,39,0,0" Name="groupBox1" VerticalAlignment="Top" Width="200">
<Grid Name="gridDetailed" DataContext="{Binding SelectedItem, ElementName=lstTestData,Mode=OneWay}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="67*" />
<ColumnDefinition Width="121*" />
</Grid.ColumnDefinitions>
<TextBox Height="23" Text="{Binding Path=TName}" HorizontalAlignment="Left" Margin="21,19,0,0" Name="textBox1" VerticalAlignment="Top" Width="87" Grid.Column="1" />
<Label Content="TName:" Height="28" HorizontalAlignment="Left" Margin="21,15,0,0" Name="label1" VerticalAlignment="Top" Grid.ColumnSpan="2" />
<CheckBox Name="cbIsComplete" Content="是否完成" IsChecked="{Binding Path=IsComplete}" Height="16" HorizontalAlignment="Left" Margin="21,66,0,0" VerticalAlignment="Top" Grid.Column="1" />
<Button Content="更新" Height="23" HorizontalAlignment="Left" Margin="24,121,0,0" Name="button3" VerticalAlignment="Top" Width="75" Click="button3_Click" Grid.Column="1" />
</Grid>
</GroupBox>
</Grid>
</Window>
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;
using System.Collections.ObjectModel;
namespace WpfApplication1
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
ObservableCollection<Test> data = new ObservableCollection<Test>();
for (int i = 0; i < 6; i++)
{
Test t = new Test()
{
Id = i,
IsComplete = false,
TName = i.ToString(),
};
data.Add(t);
}
lstTestData.ItemsSource = data;
}
private void button2_Click(object sender, RoutedEventArgs e)
{
ObservableCollection<Test> data = new ObservableCollection<Test>();
for (int i = 0; i < 8; i++)
{
Test t = new Test()
{
Id = 10 + i,
IsComplete = true,
TName = (10 + i).ToString(),
};
data.Add(t);
}
lstTestData.ItemsSource = data;
}
private void button3_Click(object sender, RoutedEventArgs e)
{
Test test = gridDetailed.DataContext as Test;
if (test!=null)
{
test.IsComplete = cbIsComplete.IsChecked.HasValue ? cbIsComplete.IsChecked.Value : false;
}
}
}
}
1，点击获取数据。（这是listbox出现了构造的数据项）
2，listbox中选择一项。（这时对应的详细信息框中相应的信息出现）
3，修改“是否完成”，原本是没有选择，现在选择，然后点击“更新”
4，再回到list选择其他任一项
5，再次选择修改项
6，再次选择其他任何一项，这时就会出现异常
在Test类中不重载GetHashCode就不会出现这个问题了，我很纠结这是为什么？
还有就是重载GetHashCode有没有什么比较好的参考？
重载Equals和GetHashCode的问题
