Question

使用WPF虚拟化DataGrid，我需要使用'全选'方法。迭代虽然网格本身不起作用，因为它只会选择UI中可见的记录 - 当然，如果使用鼠标选择它们，它们将被保留。我猜测DataTable必须改变一些东西，但是什么呢？如果是这样，它可以被操纵，以便在DataGrid中选择所有记录吗？

由于

======================== ADDED ====================== =====

伊兰 - 感谢您的回复，但有一份工作接线

创建DataGrid

 Dim DGV As New CustomControl.DGVx
    With DGV
        .Name = "Invoice_AdHoc_DGV"
        .AutoGenerateColumns = False
        .SelectionMode = SelectionMode.Multiple
    End With
    RegisterControl(Invoice_AdHoc_Grid, DGV)
    RightGrid.Children.Add(DGV)

绑定到DataTable
```
DGV.ItemsSource = AdHocDT.DefaultView
```

根据您的回答创建课程

Public Class ObjectSelectAll
Implements System.ComponentModel.INotifyPropertyChanged
Public Property Name() As String
Private vIsSelected As Boolean
Public Property IsSelected() As Boolean
Get
    Return vIsSelected
End Get
Set(value As Boolean)
    vIsSelected = value
    RaiseEvent PropertyChanged(Me, New System.ComponentModel.PropertyChangedEventArgs("IsSelected"))
End Set
End Property


Public Event PropertyChanged(sender As Object, e As System.ComponentModel.PropertyChangedEventArgs) Implements System.ComponentModel.INotifyPropertyChanged.PropertyChanged

结束班

Answer 1

cs：

    private List<MyObject> _items;
    public List<MyObject> Items
    {
        get
        {
            if(_items == null)
                _items = new List<MyObject> { new MyObject { Name = "obj1" }, new MyObject { Name = "obj2" }, new MyObject { Name = "obj3" }, new MyObject { Name = "obj4" } };
            return _items;
        }
    }

    private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        foreach (var item in Items)
        {
            item.IsSelected = true;
        }
    }
}

public class MyObject : INotifyPropertyChanged
{
    public string Name { get; set; }

    private bool _isSelected;
    public bool IsSelected
    {
        get { return _isSelected; }
        set
        {
            _isSelected = value;
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs("IsSelected"));
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
}

xaml：

    <Button Click="Button_Click_1" Content="Select All"/>

    <DataGrid Grid.Row="1" AutoGenerateColumns="False" ItemsSource="{Binding Items}">
        <DataGrid.RowStyle>
            <Style TargetType="DataGridRow">
                <Setter Property="IsSelected" Value="{Binding IsSelected}"/>                    
            </Style>
        </DataGrid.RowStyle>

        <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding Name}"/>    
        </DataGrid.Columns>

    </DataGrid>

Answer 2

最后设法解决了这个问题

在DataTable中添加了另一列

 With AdHocDT.Columns
                 .Add("Selected", GetType(Boolean))
            End With

当选择全部＆＃39;单击将所有行设置为True，并在网格中将值更新为true，然后添加此项以确保网格在虚拟数据滚动到视图时将其显示为选中

Private Sub Invoice_AdHoc_DGV_ItemsChanged(sender As Object, e As EventArgs)
    Try
        Dim DGV As CustomControl.DGVx = Invoice_AdHoc_Grid.FindName("Invoice_AdHoc_DGV")
        Dim i As Integer = 0
         For Each Row As DataRowView In DGV.Items
            Dim vRow As DevComponents.WPF.Controls.AdvGridRow = CType(DGV.ItemContainerManager.ContainerFromItem(DGV.Items(i), False), DevComponents.WPF.Controls.AdvGridRow)
            If Not vRow Is Nothing Then
                If Row("Selected") = True Then
                    vRow.IsSelected = True
                End If
            End If
            i += 1
        Next

    Catch ex As Exception
        EmailError(ex)
    End Try
End Sub

并处理事件

AddHandler DGV.ItemContainerManager.VisibleContainersChanged, AddressOf Invoice_AdHoc_DGV_ItemsChanged

现在网格显示所有选定的行： - ）

WPF DataGrid - 虚拟化 - 全选

2 个答案: