WPF DataGrid組合框導致InvalidOperationException

我嘗試編輯組合框列的值時，發現InvalidOperationException（'DeferRefresh'在AddNew或EditItem事務中不允許）。我所顯示的項目都有一個參考同一個列表中的另一個項目，所以這是我使用組合框的。它與數據網格綁定的是相同的集合。我的應用我的工作是靶向.NET 3.5，但我已經把一個例子恰恰是在.NET 4中，因爲數據網格是建立在相同的下面是在DataGrid項目代碼：WPF DataGrid組合框導致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; 
    } 
}

這是在我的窗口中的代碼：

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)); 
    } 
}

，最後我的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>

預先感謝您可以提供任何幫助！

來源

2010-08-11 aalex675

這似乎與Connect上報告的問題有關（https://connect.microsoft.com/VisualStudio/feedback/details/591125/datagrid-exception-on-validation-failure-deferrefresh-is-not-allowed ）和MSDN論壇（http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/187b2b8f-d403-4bf3-97ad-7f93b4385cdf/）;但這是迄今爲止最優雅的解決方法！ – 2011-03-21 15:59:05

我有這個問題，因爲我錯誤地將我的DataGrid和DataGridComboBoxColumn綁定到相同的集合。 – Maxence 2017-12-01 15:01:11

我發現瞭如何解決這個問題。

我創建了一個CollectionViewSource像這樣在我Window.Resources：

<Window.Resources> 
    <CollectionViewSource x:Key="itemSource" Source="{Binding Path=Items}"/> 
</Window.Resources>

然後改變了我的組合框列定義如下：

<DataGridComboBoxColumn Header="Opposite Item" Width="*" DisplayMemberPath="Name" SelectedValuePath="ID" SelectedValueBinding="{Binding Path=OppositeID}" ItemsSource="{Binding Source={StaticResource itemSource}}"/>

來源

2010-08-12 02:37:25 aalex675

嘗試如下順序在CollectionView或DataGridXYZ.Items調用Refersh前

DataGridX.CommitEdit(); 

DataGridX.CancelEdit();

爲我工作。

來源

2011-11-08 12:27:05 purvin555

發佈的代碼只是這個問題的簡短演示。真正的應用程序使用mvvm，這種方法意味着附加事件處理程序等。 – aalex675 2011-11-09 13:18:32

WPF DataGrid組合框導致InvalidOperationException

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