这个视图不允许进行EditItem操作。

Question

这个视图不允许进行EditItem操作。

4

我将尝试以编程方式向DataGrid添加项目，并允许用户编辑数据。但是，当尝试编辑数据时，我不断收到“此视图不允许EditItem”错误提示。我尝试将我添加的类变为ObservableCollection，但似乎并没有改变错误。以下是我的代码片段：

XAML:

<DataGrid x:Name="DataGridExample" HorizontalAlignment="Left" Margin="35,40,0,0" VerticalAlignment="Top" Height="220" Width="525" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding Path=Name}" ClipboardContentBinding="{x:Null}" Header="Filename"/>
                <DataGridTextColumn Binding="{Binding Path=Prefix}" ClipboardContentBinding="{x:Null}" Header="Prefix"/>
                <DataGridCheckBoxColumn Binding="{Binding Path=Sign}" ClipboardContentBinding="{x:Null}" Header="Sign"/>
                <DataGridCheckBoxColumn Binding="{Binding Path=Bin}" ClipboardContentBinding="{x:Null}" Header="Bin"/>
                <DataGridTextColumn Binding="{Binding Path=FolderPath}" ClipboardContentBinding="{x:Null}" Header="Folderpath"/>
            </DataGrid.Columns>
</DataGrid>

MainWindowClass 添加该项：

Example newExample = new Example() { FolderPath = folderpath, Name = foldername, Prefix = foldername, Bin = false, Sign = false };
DataGridExample.Items.Add(newExample);

示例类：

public class Example : ObservableCollection<Example>
{
    public string FolderPath { get; set; }

    public string Name { get; set; }

    public string Prefix { get; set; }

    public bool Sign { get; set; }

    public bool Bin { get; set; }

    public override string ToString()
    {
        return Name;
    }
}

- Deniz Zoeteman

1

你不应该以这种方式使用ObservableCollection，你需要有一个ObservableCollection<Example>，而不是每个项都是一个ObservableCollection。 - eran otzap

@eranotzap，我该怎么做？（您能给出一个类和如何添加一个示例项目的例子吗？） - Deniz Zoeteman

你尝试过附加BeginningEdithandler并设置e.Cancel = true吗？这对我很有效。请注意，这个答案不是我的，而是来自@ouflak->https://dev59.com/Y07Sa4cB1Zd3GeqP2VDv - BudBrot

@DenizZoeteman 示例：ObservableCollection<Example>你的意思是每个Example除了它自己的字段外，还是其他Examples的集合吗？ - eran otzap

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- eran otzap · Accepted Answer

xaml :

   <DataGrid ItemsSource="{Binding Examples}" AutoGenerateColumns="False">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Path=Name}" Header="Filename"/>
            <DataGridTextColumn Binding="{Binding Path=Prefix}" Header="Prefix"/>
            <DataGridCheckBoxColumn Binding="{Binding Path=Sign}" Header="Sign"/>
            <DataGridCheckBoxColumn Binding="{Binding Path=Bin}" Header="Bin"/>
            <DataGridTextColumn Binding="{Binding Path=FolderPath}" Header="Folderpath"/>
        </DataGrid.Columns>
   </DataGrid>

在您的MainWindow.cs文件中：

    public MainWindow()
    {
        InitializeComponent();
        this.DataContext = this; // By setting itself to be it's own DataContext 
     // i can easily  bind to properties in my code behind (There are other ways but this is the most               correct and easy one.)
    }


   private ObservableCollection<Example> _examples;
   public ObservableCollection<Example> Examples
   {
       get
       {
          if(_examples == null)
               _examples = new ObservableCollection<Example>();
          return _examples; 
       } 
   }

   public void OnAddingItem()
   {
       Example newExample = new Example() { FolderPath = folderpath, Name = foldername, Prefix = foldername, Bin = false, Sign = false };
       Examples.Add(newExample); // Because Examples is an ObservableCollection it raises a    
    //CollectionChanged event when adding or removing items,
    // the ItemsControl (DataGrid) in your case corresponds to that event and creates a new container for the item ( i.e. new DataGridRow ).
   }