对我来说，最好的方式来实现可编辑异步DataGrid看起来像这样：
视图模型：
public class UserTextMainViewModel : ViewModelBase
{
private bool _isBusy;
public bool IsBusy
{
get { return _isBusy; }
set
{
this._isBusy = value;
OnPropertyChanged();
}
}
private bool _isSearchActive;
private bool _isLoading;
private string _searchInput;
public string SearchInput
{
get { return _searchInput; }
set
{
_searchInput = value;
OnPropertyChanged();
_isSearchActive = !string.IsNullOrEmpty(value);
ApplySearch();
}
}
private ListCollectionView _translationsView;
public ListCollectionView TranslationsView
{
get
{
if (_translationsView == null)
{
OnRefreshRequired();
}
return _translationsView;
}
set
{
_translationsView = value;
OnPropertyChanged();
}
}
private void ApplySearch()
{
var view = TranslationsView;
if (view == null) return;
if (!_isSearchActive)
{
view.Filter = null;
}
else if (view.Filter == null)
{
view.Filter = FilterUserText;
}
else
{
view.Refresh();
}
}
private bool FilterUserText(object o)
{
if (!_isSearchActive) return true;
var item = (UserTextViewModel)o;
return item.Key.Contains(_searchInput, StringComparison.InvariantCultureIgnoreCase) ||
item.Value.Contains(_searchInput, StringComparison.InvariantCultureIgnoreCase);
}
private ICommand _clearSearchCommand;
public ICommand ClearSearchCommand
{
get
{
return _clearSearchCommand ??
(_clearSearchCommand =
new DelegateCommand((param) =>
{
this.SearchInput = string.Empty;
}, (p) => !string.IsNullOrEmpty(this.SearchInput)));
}
}
private async void OnRefreshRequired()
{
if (_isLoading) return;
_isLoading = true;
IsBusy = true;
try
{
var result = await LoadDefinitions();
TranslationsView = new ListCollectionView(result);
}
catch (Exception ex)
{
//ex.HandleError();//TODO: Needs to create properly error handling
}
_isLoading = false;
IsBusy = false;
}
private async Task<IList> LoadDefinitions()
{
var translatioViewModels = await Task.Run(() => TranslationRepository.Instance.AllTranslationsCache
.Select(model => new UserTextViewModel(model)).ToList());
return translatioViewModels;
}
}
XAML：
<UserControl x:Class="UCM.WFDesigner.Views.UserTextMainView"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:model="clr-namespace:Cellebrite.Diagnostics.Model.Entities;assembly=Cellebrite.Diagnostics.Model"
xmlns:System="clr-namespace:System;assembly=mscorlib"
xmlns:converters1="clr-namespace:UCM.Infra.Converters;assembly=UCM.Infra"
xmlns:core="clr-namespace:UCM.WFDesigner.Core"
mc:Ignorable="d"
d:DesignHeight="300"
d:DesignWidth="300">
<DockPanel>
<StackPanel Orientation="Horizontal"
DockPanel.Dock="Top"
HorizontalAlignment="Left">
<DockPanel>
<TextBlock Text="Search:"
DockPanel.Dock="Left"
VerticalAlignment="Center"
FontWeight="Bold"
Margin="0,0,5,0" />
<Button Style="{StaticResource StyleButtonDeleteCommon}"
Height="20"
Width="20"
DockPanel.Dock="Right"
ToolTip="Clear Filter"
Command="{Binding ClearSearchCommand}" />
<TextBox Text="{Binding SearchInput, UpdateSourceTrigger=PropertyChanged}"
Width="500"
VerticalContentAlignment="Center"
Margin="0,0,2,0"
FontSize="13" />
</DockPanel>
</StackPanel>
<Grid>
<DataGrid ItemsSource="{Binding Path=TranslationsView}"
AutoGenerateColumns="False"
SelectionMode="Single"
CanUserAddRows="True">
<DataGrid.Columns>
<!-- your columns definition is here-->
</DataGrid.Columns>
</DataGrid>
<!-- your "busy indicator", that shows to user a message instead of stuck data grid-->
<Border Visibility="{Binding IsBusy,Converter={converters1:BooleanToSomethingConverter TrueValue='Visible', FalseValue='Collapsed'}}"
Background="#50000000">
<TextBlock Foreground="White"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Text="Loading. . ."
FontSize="16" />
</Border>
</Grid>
</DockPanel>
该模式允许以非常简单的方式使用数据网格，代码也非常简单。 不要忘记为表示数据源的类创建默认构造函数。
其实，任务是一个ObservableCollection。我做了一个测试项目，将数据网格绑定到相同类型的集合，并且空白行出现在网格的底部。文森特的博客文章很好，但他让你听起来像你必须实现IEditableObject，但事实并非如此。绑定到ObservableCollection 的普通香草DataGrid应显示空白行。请参阅http://www.codeproject.com/KB/WPF/MVVM_DataGrid.aspx。 –
2009-09-23 18:36:10
非常感谢你的帮助。真诚。 – Star 2013-07-06 13:29:37