Question

我正在尝试将DataGrid与ObservableCollection列表绑定。我基本上在表单的开头向列表中添加了一些项目（应该向数据网格中添加行），然后使用此代码在不同的线程中动态更新列：

UserDataGrid.Dispatcher.BeginInvoke(new Action(() =>
            {
                UserDataGridCollection[m_iID].Status = Log;
                UserDataGridCollection[m_iID].ID = m_iID;
                UserDataGridCollection[m_iID].User = m_sUser;
            }

如果我以此方式更新DataGrid，它可以工作，但滞后于UI线程：

                UserDataGrid.ItemsSource = null;
                UserDataGrid.ItemsSource = UserDataGridCollection;

我尝试使用PropertyChanged事件，但是DataGrid首先没有填充，所以我不确定这是否正常工作。这是我的数据类：

public class UserDataGridCategory : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private int id;
    private string user, status;

    public int ID
    {
        get { return id; }
        set { id = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("ID")); }
    }
    public string User
    {
        get { return user; }
        set { user = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("User")); }
    }
    public string Status
    {
        get { return status; }
        set { status = value; PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Status")); }
    }
}

这是我创建ObservableCollection的方式：

static class UserEngine
{
public static ObservableCollection<UserDataGridCategory> UserDataGridCollection { get; set; }
public static object _lock = new object();

public static void RunEngine(DataGrid UserDataGrid)
{
     UserDataGridCollection = new ObservableCollection<UserDataGridCategory>();
     BindingOperations.EnableCollectionSynchronization(UserDataGridCollection, _lock);

     // Some other  code

     // Spawn thread to invoke dispatcher and do some other stuff
}
}

这是我的xaml：

<DataGrid Name="UserDataGrid" x:FieldModifier="public" ItemsSource="{Binding UserDataGridCollection}" SelectedItem="{Binding SelectedRow, Mode=TwoWay}" Margin="10,16,22.6,215" AutoGenerateColumns="False" IsReadOnly="True">
                    <DataGrid.Resources>
                        <ContextMenu x:Key="RowMenu" Focusable="False"
        DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
                            <MenuItem Header="View Log" Click="ViewLog" Focusable="False"/>
                        </ContextMenu>
                    </DataGrid.Resources>
                    <DataGrid.RowStyle>
                        <Style TargetType="DataGridRow" >
                            <Setter Property="ContextMenu" Value="{StaticResource RowMenu}" />
                        </Style>

                    </DataGrid.RowStyle>
                    <DataGrid.Columns>
                        <DataGridTextColumn Header="ID #" Binding="{Binding ID, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" IsReadOnly="True"/>
                        <DataGridTextColumn Header="User" Binding="{Binding User, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" IsReadOnly="True" Width="150"/>
                        <DataGridTextColumn Header="Status" Binding="{Binding Status,Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" IsReadOnly="True" Width="250"/>
                    </DataGrid.Columns>
                </DataGrid>

任何帮助将不胜感激，谢谢！

Answer 1

也许有助于将您的itemsource绑定到不是可观察的集合，而是绑定到CollectionViewSource。

public class UserEngine {
public ICollectionView UserdataCollectionView { get; set; }

public UserEngine()    { 'constructor
    UserdataCollectionView = CollectionViewSource.GetDefaultView(UserDataGridCollection );
}

public void addnewLinetoOC(){
    // after you add a new entry into your observable collection 
    UserdataCollectionView .Refresh();
}
}

您必须在xaml中设置

ItemsSource="{Binding UserdataCollectionView }"

不能100％确定此解决方案是否适合您的问题，但这就是我解决了向视图模型中的可观察集合添加新项的方法。

动态更新绑定的DataGrid

1 个答案: