问题描述
我遇到InvalidOperationException(在AddNew或EditItem事务期间不允许使用‘DeferRefresh’。)当我尝试编辑组合框列的值时,从我的数据网格。我显示的所有项都引用了同一列表中的另一个项,所以这就是我使用组合框的目的。它被绑定到与数据网格相同的集合。我正在开发的应用程序以.NET3.5为目标,但我已经编写了一个在.NET4中完全相同的示例,因为数据网格是内置的。以下是数据网格中项目的代码:
public class TestItem : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
private int m_ID;
private string m_Name;
private int m_OppositeID;
public int ID
{
get { return m_ID; }
set
{
m_ID = value;
RaisePropertyChanged("ID");
}
}
public string Name
{
get { return m_Name; }
set
{
m_Name = value;
RaisePropertyChanged("Name");
}
}
public int OppositeID
{
get { return m_OppositeID; }
set
{
m_OppositeID = value;
RaisePropertyChanged("OppositeID");
}
}
public TestItem(int id, string name, int oppID)
{
ID = id;
Name = name;
OppositeID = oppID;
}
}
这是我窗口中的代码:
public partial class MainWindow : Window, INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private void RaisePropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
private ObservableCollection<TestItem> m_Items;
public ObservableCollection<TestItem> Items
{
get { return m_Items; }
set
{
m_Items = value;
RaisePropertyChanged("Items");
}
}
public MainWindow()
{
InitializeComponent();
this.DataContext = this;
Items = new ObservableCollection<TestItem>();
Items.Add(new TestItem(0, "Fixed", 0));
Items.Add(new TestItem(1, "Left Side", 2));
Items.Add(new TestItem(2, "Right Side", 1));
}
}
最后是我的XAML:
<Window x:Class="DataGrid_Combo_Test.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 ItemsSource="{Binding Path=Items}" AutoGenerateColumns="False">
<DataGrid.Resources>
<Style x:Key="ItemsSourceStyle" TargetType="ComboBox">
<Setter Property="ItemsSource" Value="{Binding Path=DataContext.Items, RelativeSource={RelativeSource AncestorType={x:Type Window}}}"/>
</Style>
</DataGrid.Resources>
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding Path=ID}" Header="ID" Width="*"/>
<DataGridTextColumn Binding="{Binding Path=Name}" Header="Name" Width="*"/>
<DataGridComboBoxColumn Header="Opposite Item" Width="*" DisplayMemberPath="Name" SelectedValuePath="ID" SelectedValueBinding="{Binding Path=OppositeID}" ElementStyle="{StaticResource ItemsSourceStyle}" EditingElementStyle="{StaticResource ItemsSourceStyle}"/>
</DataGrid.Columns>
</DataGrid>
</Grid>
</Window>
预先感谢您所能提供的任何帮助!
推荐答案
我发现了如何修复此问题。
我在我的Windows中创建了一个CollectionViewSource,如下所示。资源:
<Window.Resources>
<CollectionViewSource x:Key="itemSource" Source="{Binding Path=Items}"/>
</Window.Resources>
然后将我的组合框列定义更改为以下内容:
<DataGridComboBoxColumn Header="Opposite Item" Width="*" DisplayMemberPath="Name" SelectedValuePath="ID" SelectedValueBinding="{Binding Path=OppositeID}" ItemsSource="{Binding Source={StaticResource itemSource}}"/>