Question

我有一个非常简单的DataGridTextColumn，应在doubleclick事件中对其进行修改。问题是应该添加什么来避免出现异常System.InvalidOperationException: ''EditItem' is not allowed for this view.'

<DataGrid x:Name="DG" ItemsSource="{Binding}" GridLinesVisibility="None" Grid.Column="3" Grid.Row="2">
    <DataGrid.Columns>
        <DataGridTextColumn Header="Name" Binding="{Binding VariantSet, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" MinWidth="60" />
    </DataGrid.Columns>
</DataGrid>

简单类：

Public Class CName
    Public Property Name As String = "not editable name"
End Class

仅在加载时简单地添加到datagrid

Private Sub MainWindow_Loaded(sender As Object, e As RoutedEventArgs) Handles Me.Loaded
    Me.DG.Items.Add(New CName)
End Sub

通过以下模板进行声明时，没有区别，相同错误

        <DataGridTemplateColumn Header="Name" IsReadOnly="False">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Name}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <TextBox Text="{Binding Name}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>

即使将Implements ComponentModel.INotifyPropertyChanged添加到CName，也没有区别

Answer 1

您对我们的了解不足以告诉您您在做错什么。

这是一个带有datagrid的工作窗口。

代码是c＃，但是如果您特别想要vb，则可以通过转换器将其运行到vb。我认为现在初学者选择vb是个坏主意。几乎没有人使用vb发布样本。

在我的主窗口中：

    <configuration>
      <configSections>
        <section name="CustomSection" type="ConfigurationPropertyExample.CustomSection, ConfigurationPropertyExample" 
          allowDefinition="Everywhere" allowExeDefinition="MachineToApplication" 
          restartOnExternalChanges="true" />
      </configSections>
      <CustomSection fileName="override.txt" alias="alias.txt" 
        maxUsers="1000" maxIdleTime="00:05:00" />
    </configuration>

该视图模型：

<Window.DataContext>
    <local:MainWindowViewModel/>
</Window.DataContext>
<Grid>
    <DataGrid AutoGenerateColumns="False"
              ItemsSource="{Binding People}">
        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding FirstName}" Header="First Name"/>
            <DataGridTextColumn Binding="{Binding LastName}" Header="SurName"/>
        </DataGrid.Columns>
    </DataGrid>
</Grid>

人员只有名字和姓氏这两个属性：

public class MainWindowViewModel : BaseViewModel
{
    private ObservableCollection<Person> people = new ObservableCollection<Person>();

    public ObservableCollection<Person> People
    {
        get { return people; }
        set { people = value; }
    }

    public MainWindowViewModel()
    {
        People.Add(new Person { FirstName = "Chesney", LastName = "Brown" });
        People.Add(new Person { FirstName = "Gary", LastName = "Windass" });
        People.Add(new Person { FirstName = "Liz", LastName = "McDonald" });
        People.Add(new Person { FirstName = "Carla", LastName = "Connor" });
    }
}

它继承自BaseViewmodel，后者仅实现了inotifypropertychanged。

public class Person : BaseViewModel
{
    private string firstName;

    public string FirstName
    {
        get { return firstName; }
        set { firstName = value; RaisePropertyChanged(); }
    }
    private string lastName;

    public string LastName
    {
        get { return lastName; }
        set { lastName = value; RaisePropertyChanged(); }
    }

我在这里编辑一行

WPF DataGridTextColumn直接编辑

1 个答案: