请尝试下一个解决方案。正如你所看到的，我使用了一个代理对象将一个主数据上下文传递给每个数据网格单元。另外还有一个DataTrigger，它在隐藏列的可见性发生变化时有效，并且有一个附加属性有助于控制实际列的宽度。 下面是代码：
XAML代码
<Window x:Class="DataGridSoHelpAttempt.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:dataGridSoHelpAttempt="clr-namespace:DataGridSoHelpAttempt"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
Title="MainWindow" Height="350" Width="525" x:Name="This">
<Window.DataContext>
<dataGridSoHelpAttempt:MainViewModel/>
</Window.DataContext>
<Grid x:Name="MyGrid">
<Grid.Resources>
<dataGridSoHelpAttempt:FreezableProxyClass x:Key="ProxyElement" ProxiedDataContext="{Binding Source={x:Reference This}, Path=DataContext}"/>
</Grid.Resources>
<DataGrid x:Name="MyDataGrid" ItemsSource="{Binding DataSource}" AutoGenerateColumns="False">
<DataGrid.Columns>
<DataGridTextColumn Header="Name" Binding="{Binding Name}"/>
<DataGridTextColumn Header="Description" Binding="{Binding Description}" Visibility="{Binding Source={StaticResource ProxyElement},
Path=ProxiedDataContext.Visibility, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
<DataGridTextColumn Header="Comments" Binding="{Binding Comments}"/>
<DataGridTextColumn Header="Price (click to see total)" Binding="{Binding Price, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
</DataGrid.Columns>
<DataGrid.Resources>
<Style TargetType="DataGridCell" BasedOn="{StaticResource {x:Type DataGridCell}}">
<Style.Triggers>
<DataTrigger Binding="{Binding Source={StaticResource ProxyElement},
Path=ProxiedDataContext.Visibility, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Value="Visible">
<Setter Property="Width" Value="200"></Setter>
<Setter Property="dataGridSoHelpAttempt:DataGridAttached.ColumnActualWidth" Value="200"/>
</DataTrigger>
<DataTrigger Binding="{Binding Source={StaticResource ProxyElement},
Path=ProxiedDataContext.Visibility, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Value="Collapsed">
<Setter Property="Width" Value="400"></Setter>
<Setter Property="dataGridSoHelpAttempt:DataGridAttached.ColumnActualWidth" Value="400"/>
</DataTrigger>
</Style.Triggers>
</Style>
</DataGrid.Resources>
</DataGrid>
<StackPanel HorizontalAlignment="Stretch" VerticalAlignment="Bottom">
<Button Content="Show Description" Command="{Binding Command}"></Button>
</StackPanel>
</Grid></Window>
附加属性代码
public class DataGridAttached
{
public static readonly DependencyProperty ColumnActualWidthProperty = DependencyProperty.RegisterAttached(
"ColumnActualWidth", typeof (double), typeof (DataGridAttached), new PropertyMetadata(default(double), ColumnActualWidthPropertyChanged));
private static void ColumnActualWidthPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var data = d.FindParent<DataGrid>();
var control = (d as Control);
if(data == null || control == null) return;
data.Columns.ToList().ForEach(column =>
{
var cellWidth = control.Width;
if(double.IsNaN(cellWidth) || double.IsInfinity(cellWidth)) return;
column.Width = cellWidth;
});
}
public static void SetColumnActualWidth(DependencyObject element, double value)
{
element.SetValue(ColumnActualWidthProperty, value);
}
public static double GetColumnActualWidth(DependencyObject element)
{
return (double) element.GetValue(ColumnActualWidthProperty);
}
}
视图模型和模型
public class MainViewModel:BaseObservableObject
{
private Visibility _visibility;
private ICommand _command;
private Visibility _totalsVisibility;
private double _totalValue;
private double _columnWidth;
public MainViewModel()
{
Visibility = Visibility.Collapsed;
TotalsVisibility = Visibility.Collapsed;
DataSource = new ObservableCollection<BaseData>(new List<BaseData>
{
new BaseData {Name = "Uncle Vania", Description = "A.Chekhov, play", Comments = "worth reading", Price = 25},
new BaseData {Name = "Anna Karenine", Description = "L.Tolstoy, roman", Comments = "worth reading", Price = 35},
new BaseData {Name = "The Master and Margarita", Description = "M.Bulgakov, novel", Comments = "worth reading", Price = 56},
});
}
public ICommand Command
{
get
{
return _command ?? (_command = new RelayCommand(VisibilityChangingCommand));
}
}
private void VisibilityChangingCommand()
{
Visibility = Visibility == Visibility.Collapsed ? Visibility.Visible : Visibility.Collapsed;
ColumnWidth = Visibility == Visibility.Visible ? 200d : 400d;
}
public ObservableCollection<BaseData> DataSource { get; set; }
public Visibility Visibility
{
get { return _visibility; }
set
{
_visibility = value;
OnPropertyChanged();
}
}
public ObservableCollection<BaseData> ColumnCollection
{
get { return DataSource; }
}
public Visibility TotalsVisibility
{
get { return _totalsVisibility; }
set
{
_totalsVisibility = value;
OnPropertyChanged();
}
}
public double TotalValue
{
get { return ColumnCollection.Sum(x => x.Price); }
}
public double ColumnWidth
{
get { return _columnWidth; }
set
{
_columnWidth = value;
OnPropertyChanged();
}
}
}
public class BaseData:BaseObservableObject
{
private string _name;
private string _description;
private string _comments;
private int _price;
public virtual string Name
{
get { return _name; }
set
{
_name = value;
OnPropertyChanged();
}
}
public virtual object Description
{
get { return _description; }
set
{
_description = (string) value;
OnPropertyChanged();
}
}
public string Comments
{
get { return _comments; }
set
{
_comments = value;
OnPropertyChanged();
}
}
public int Price
{
get { return _price; }
set
{
_price = value;
OnPropertyChanged();
}
}
}
可冻结助手
public class FreezableProxyClass : Freezable
{
protected override Freezable CreateInstanceCore()
{
return new FreezableProxyClass();
}
public static readonly DependencyProperty ProxiedDataContextProperty = DependencyProperty.Register(
"ProxiedDataContext", typeof (object), typeof (FreezableProxyClass), new PropertyMetadata(default(object)));
public object ProxiedDataContext
{
get { return (object) GetValue(ProxiedDataContextProperty); }
set { SetValue(ProxiedDataContextProperty, value); }
}
}
助手
public static class VisualTreeHelperExtensions
{
public static T FindParent<T>(this DependencyObject child) where T : DependencyObject
{
while (true)
{
//get parent item
DependencyObject parentObject = VisualTreeHelper.GetParent(child);
//we've reached the end of the tree
if (parentObject == null) return null;
//check if the parent matches the type we're looking for
T parent = parentObject as T;
if (parent != null)
return parent;
child = parentObject;
}
}
}
public class BaseObservableObject : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
var handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
protected virtual void OnPropertyChanged<T>(Expression<Func<T>> raiser)
{
var propName = ((MemberExpression)raiser.Body).Member.Name;
OnPropertyChanged(propName);
}
protected bool Set<T>(ref T field, T value, [CallerMemberName] string name = null)
{
if (!EqualityComparer<T>.Default.Equals(field, value))
{
field = value;
OnPropertyChanged(name);
return true;
}
return false;
}
}
public class RelayCommand : ICommand
{
private readonly Func<bool> _canExecute;
private readonly Action _execute;
public RelayCommand(Action execute)
: this(() => true, execute)
{
}
public RelayCommand(Func<bool> canExecute, Action execute)
{
_canExecute = canExecute;
_execute = execute;
}
public bool CanExecute(object parameter = null)
{
return _canExecute();
}
public void Execute(object parameter = null)
{
_execute();
}
public event EventHandler CanExecuteChanged;
}
public class RelayCommand<T> : ICommand
where T:class
{
private readonly Predicate<T> _canExecute;
private readonly Action<T> _execute;
public RelayCommand(Action<T> execute):this(obj => true, execute)
{
}
public RelayCommand(Predicate<T> canExecute, Action<T> execute)
{
_canExecute = canExecute;
_execute = execute;
}
public bool CanExecute(object parameter)
{
return _canExecute(parameter as T);
}
public void Execute(object parameter)
{
_execute(parameter as T);
}
public event EventHandler CanExecuteChanged;
}
它是完整的测试解决方案，你应该把这个是如何工作的只是想法。如果您遇到代码问题，我很乐意提供帮助。
问候。
谢谢！我用另一种方式解决了我的问题，但是我受到了你的解决方案的影响！非常感谢！ – Lamelas84