Question

所以我得到了这个DataGrid和以下类，但是当我编辑DataGrid中的一些值时，我不会进入DataNodeModel的PropertyChanged事件。

这是DataGrid：

<DataGrid 
    Grid.Row="0"
    ItemsSource="{Binding ElementName=root, Path=Model.DataNodeModel, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True}"
    CanUserAddRows="True" 
    CanUserDeleteRows="True" 
    HorizontalAlignment="Stretch" 
    VerticalAlignment="Stretch" 
    HorizontalContentAlignment="Stretch" 
    VerticalContentAlignment="Stretch"
    CanUserSortColumns="True" 
    CanUserResizeColumns="True" 
    SelectedItem="{Binding ElementName=root, Path=Model.SelectedDataNodeModel, UpdateSourceTrigger=PropertyChanged}"
    IsReadOnly="False" 
    IsEnabled="True"
    >
    <DataGrid.Columns>
        <DataGridTextColumn 
            Header="Title" 
            Binding="{Binding Path=Title}"  
            Width="70" 
            />
        <DataGridTextColumn 
            Header="DefaultValue" 
            Binding="{Binding Path=DefaultValue}"  
            Width="70"  
            />
        <DataGridTextColumn 
            Header="Type" 
            Binding="{Binding Path=Type}" 
            Width="70" 
            />
        <DataGridTextColumn 
            Header="Id" 
            Binding="{Binding Path=Id, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, NotifyOnTargetUpdated=True, NotifyOnSourceUpdated=True}" 
            Width="70" 
            />
    </DataGrid.Columns>
</DataGrid>

这也是我的DataNodeModel的类，它是我的DataGrid的ItemsSource：

public class DataNodeField : INotifyPropertyChanged
{
    private string mDefaultValue, mId, mTitle, mType;

    public string Id
    {
        get { return mId; }
        set
        {
            mId = value;
            OnPropertyChanged();
        }
    }

    public string Title
    {
        get { return mTitle; }
        set
        {
            mTitle = value;
            OnPropertyChanged();
        }
    }

    public string Type
    {
        get { return mType; }
        set
        {
            mType = value;
            OnPropertyChanged();
        }
    }

    public string DefaultValue
    {
        get { return mDefaultValue; }
        set
        {
            mDefaultValue = value;
            OnPropertyChanged();
        }
    }


    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged(string propertyName = null)
    {
        if (PropertyChanged != null)
            PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

这也是我的模型的样子（删除了大部分内容，因为它没有添加到示例中：

    internal partial class DataNodeViewModel {
             ...

        private ObservableCollection<DataNodeField> mDataNodeModel;

        private DataNodeField mSelectedDataNodeModel;
        public DataNodeField SelectedDataNodeModel
        {
            get { return mSelectedDataNodeModel; }
            set
            {
                mSelectedDataNodeModel = value;
                OnPropertyChanged("SelectedDataNodeModel");
            }
        }
        public ObservableCollection<DataNodeField> DataNodeModel
        {
            get { return mDataNodeModel; }
            set
            {
                if (SelectedDataNodeModel != null)
                {
                   //Do Stuff
                }
                mDataNodeModel = value;
                OnPropertyChanged("DataNodeModel");
            }
        }

所以我真的无法弄清楚当我更改DataGrid中的值时，为什么我的DataNodeModel的PropertyChanged不会被执行。已经找了几天而且不知道为什么会这样。有人可以帮忙吗？（=

DataGrid在更改值时不执行PropertyChanged

0 个答案: