[英]Updating Binded DataGrid Dynamically
我正在嘗試將DataGrid與ObservableCollection列表綁定。 我基本上在窗體的開頭向列表中添加了一些項目(應該向數據網格中添加行),然后使用此代碼在不同的線程中動態更新列:
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,則它可以工作,但滯后於UI線程:
UserDataGrid.ItemsSource = null;
UserDataGrid.ItemsSource = UserDataGridCollection;
我嘗試使用PropertyChanged事件,但是DataGrid首先沒有填充,因此我不確定這是否正常工作。 這是我的數據類:
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")); }
}
}
這是我創建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
}
}
這是我的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>
任何幫助將不勝感激,謝謝!
也許這有助於將您的itemsource綁定到一個CollectionViewSource而不是一個可觀察的集合。
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();
}
}
在您的XAML中,您必須設置
ItemsSource="{Binding UserdataCollectionView }"
不能100%確定此解決方案是否適合您的問題,但這就是我解決了向視圖模型中的可觀察集合添加新項的方法。
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