我尝试编辑组合框列的值时,发现InvalidOperationException('DeferRefresh'在AddNew或EditItem事务中不允许)。我所显示的项目都有一个参考同一个列表中的另一个项目,所以这是我使用组合框的。它与数据网格绑定的是相同的集合。我的应用我的工作是靶向.NET 3.5,但我已经把一个例子恰恰是在.NET 4中,因为数据网格是建立在相同的下面是在DataGrid项目代码:WPF DataGrid组合框导致InvalidOperationException
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;
}
}
这是在我的窗口中的代码:
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>
预先感谢您可以提供任何帮助!
这似乎与Connect上报告的问题有关(https://connect.microsoft.com/VisualStudio/feedback/details/591125/datagrid-exception-on-validation-failure-deferrefresh-is-not-allowed )和MSDN论坛(http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/187b2b8f-d403-4bf3-97ad-7f93b4385cdf/);但这是迄今为止最优雅的解决方法! – 2011-03-21 15:59:05
我有这个问题,因为我错误地将我的DataGrid和DataGridComboBoxColumn绑定到相同的集合。 – Maxence 2017-12-01 15:01:11