c# – DataGrid选择列

概述我试图以编程方式选择 WPF DataGrid中的整个列.我的代码似乎工作,但它真的很慢！我猜这是因为它不断调用ScrollIntoView.有人可以帮助我找到加速它的解决方案或选择整个列的替代方案吗？ public static void SelectColumn(DataGrid grid, int column){ for (int i = 0; i < grid.Items.Co 我试图以编程方式选择 WPF DataGrID中的整个列.我的代码似乎工作,但它真的很慢！我猜这是因为它不断调用ScrollintoVIEw.有人可以帮助我找到加速它的解决方案或选择整个列的替代方案吗？

public static voID SelectColumn(DataGrID grID,int column){    for (int i = 0; i < grID.Items.Count; i++)    {        // Select each cell in this column        var cell = DataGrIDHelper.GetCell(grID,i,column);        if (cell != null)        {            cell.IsSelected = true;        }    }    DataGrIDHelper.GetCell(grID,column).Focus();}public static DataGrIDCell GetCell(DataGrID grID,int row,int column){    DataGrIDRow rowContainer = GetRow(grID,row);    if (rowContainer != null)    {        DataGrIDCellsPresenter presenter = TreeHelper.GetVisualChild<DataGrIDCellsPresenter>(rowContainer);        if (presenter == null)        {            // may be virtualized,bring into vIEw and try again            grID.ScrollintoVIEw(rowContainer,grID.Columns[column]);            presenter = TreeHelper.GetVisualChild<DataGrIDCellsPresenter>(rowContainer);        }        if (presenter != null)        {            // try to get the cell but it may possibly be virtualized            DataGrIDCell cell = (DataGrIDCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);            if (cell == null)            {                // may be virtualized,bring into vIEw and try again                grID.ScrollintoVIEw(rowContainer,grID.Columns[column]);                cell = (DataGrIDCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);            }            return cell;        }    }    return null;}public static DataGrIDRow GetRow(DataGrID grID,int index){    DataGrIDRow row = (DataGrIDRow)grID.ItemContainerGenerator.ContainerFromIndex(index);    if (row == null)    {        // may be virtualized,bring into vIEw and try again        grID.ScrollintoVIEw(grID.Items[index]);        row = (DataGrIDRow)grID.ItemContainerGenerator.ContainerFromIndex(index);    }    return row;}

更新：

我正在尝试@ianschol建议的解决方案.这就是我所拥有的(我在b / c后面的代码中绑定我不知道在运行时需要多少列)：

for (int i = 0; i < this.CurrentData.Data[0].Length; i++)        {            TheGrID.Columns.Add(                new DataGrIDTextColumn                {                    header = (this.CurrentData.Rank > 1) ? string.Format(this.culture,headerFormatString,i + 1) : string.Empty,Binding = new Binding(string.Format("[{0}].DataValue",i)) { ValIDatesOnDataErrors = true,UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged },WIDth = DataGrIDLength.auto,ElementStyle = new Style                    {                        targettype = typeof(TextBlock),Triggers = { this.errorTrigger }                    },EditingElementStyle = new Style                    {                        targettype = typeof(TextBox),CellStyle = new Style                    {                        targettype = typeof(DataGrIDCell),Setters =                        {                            new Setter                            {                                Property = DataGrIDCell.IsSelectedProperty,Value = new Binding(string.Format("[{0}].IsSelected",i)) { Mode = BindingMode.TwoWay,}                        },}                });        }

和我的IsSelected财产：

private bool isSelected = false;    public bool IsSelected    {        get        {            return this.isSelected;        }        set        {            this.isSelected = value;            OnPropertyChanged("IsSelected");        }    }

而新的SelectColumn代码：

public static voID SelectColumn(DataGrID grID,int column)    {        for (int i = 0; i < grID.Items.Count; i++)        {            // Select each cell in this column            ((DataItem[])(grID.Items[i]))[column].IsSelected = true;        }    }

问题是,如果我在代码中更新IsSelected属性,它会更新GUI(有点,它古怪),但反之亦然.即如果我在GUI中选择一个单元格/行,它不会在代码中调用属性设置器.你可以看到绑定是TwoWay所以我不确定这个问题.

另一个更新：问题似乎与虚拟化有关.如果我关闭虚拟化(VirtualizingStackPanel.IsVirtualizing =“False”),它可以正常工作.

解决方法 一种更有效的方法可能是在DataSource的类上使用IsSelected属性,这样每列都有一个相应的“IsSelected”属性.

public class MyData : INotifyPropertyChanged{    private string name;    public string name    {        get { return name; }        set        {            name = value;            Notify("name");        }    }    private bool nameSelected = false;    public bool nameSelected    {        get { return nameSelected; }        set        {            nameSelected = value;            Notify("nameSelected");        }    }  //... etc ...}

接下来,您可以更改每个Column的CellStyle,以将单元格的IsSelected属性绑定到类上的相关IsSelected属性.

<DataGrID ItemsSource="{Binding Users}" autoGenerateColumns="False" HorizontalAlignment="left" name="scratchGrID" CanUserAddRows="False"              VerticalScrollbarVisibility="auto" SelectionUnit="Cell">        <DataGrID.Columns>            <DataGrIDTextColumn Binding="{Binding name}" header="User name" WIDth="200">                <DataGrIDTextColumn.CellStyle>                    <Style targettype="{x:Type DataGrIDCell}">                        <Setter Property="IsSelected" Value="{Binding nameSelected}" />                    </Style>                </DataGrIDTextColumn.CellStyle>            </DataGrIDTextColumn>            <DataGrIDTextColumn Binding="{Binding Age}" header="User Age" WIDth="80">                <DataGrIDTextColumn.CellStyle>                    <Style targettype="{x:Type DataGrIDCell}">                        <Setter Property="IsSelected" Value="{Binding AgeSelected}" />                    </Style>                </DataGrIDTextColumn.CellStyle>            </DataGrIDTextColumn>        </DataGrID.Columns>    </DataGrID>

最后,像这样实现你的select-all代码(这会在Age上选择all,你可能希望做一个更通用/更优雅的实现;))：

foreach (MyData user in Users)        {            user.AgeSelected = true;        }

您必须注意确保所有NotifyPropertyChanged行为都排成一行,因为您希望网格能够识别其绑定集合中的属性正在更新.

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