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在本文中您将学习到DevExpress WPF Grid控件如何在网格视图数据布局中遍历代码中的行和单元格，欢迎下载最新版组件体验！

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本文演示如何逐个访问数据项。

遍历行

DevExpress WPF GridControl通过句柄或可见索引标识数据行，DataControlBase.VisibleRowCount属性返回可见组和数据行的总数。为了遍历行，使用一个从0到DataControlBase.VisibleRowCount属性值的计数器。在这个代码示例中，我们使用GridControl.GetRowHandleByVisibleIndex方法来获取行句柄：

XAML

<dxg:GridControl x:Name="grid" ItemsSource="{Binding Source}" .../>

C#

List<int> rowHandles = new List<int>();
for (int i = 0; i < grid.VisibleRowCount; i++) {
int rowHandle = grid.GetRowHandleByVisibleIndex(i);
rowHandles.Add(rowHandle);
}

VB.NET

Dim rowHandles As List(Of Integer) = New List(Of Integer)()

For i As Integer = 0 To grid.VisibleRowCount - 1
Dim rowHandle As Integer = grid.GetRowHandleByVisibleIndex(i)
rowHandles.Add(rowHandle)
Next

DataControlBase.VisibleRowCount属性不考虑：

• 折叠组中的行
• 用过滤器隐藏的行
• 服务行（自动筛选行、新建项行）
• 来自GridControls详细的行

注意：当您在GridControl的底部显示New Item Row时，DataControlBase.VisibleRowCount属性将其视为常规行。

要遍历分组中的折叠行，请使用GridControl.GetChildRowCount方法。此方法返回分组中当前行的计数。创建一个类似于前一个的计数器，并使用GridControl.GetChildRowHandle方法来获取组中行的句柄，使用GridControl.IsGroupRowHandle 方法检查行是否为分组行。

下面的示例展示如何获取视图中所有数据行的句柄（包括折叠组中的行），除了被过滤掉的行：

C#

private List<int> GetDataRowHandles() {
List<int> rowHandles = new List<int>();
for (int i = 0; i < grid.VisibleRowCount; i++) {
int rowHandle = grid.GetRowHandleByVisibleIndex(i);
if (grid.IsGroupRowHandle(rowHandle)) {
if (!grid.IsGroupRowExpanded(rowHandle)) {
rowHandles.AddRange(GetDataRowHandlesInGroup(rowHandle));
}
}
else
rowHandles.Add(rowHandle);
}
return rowHandles;
}
private List<int> GetDataRowHandlesInGroup(int groupRowHandle) {
List<int> rowHandles = new List<int>();
for (int i = 0; i < grid.GetChildRowCount(groupRowHandle); i++) {
int rowHandle = grid.GetChildRowHandle(groupRowHandle, i);
if (grid.IsGroupRowHandle(rowHandle)) {
rowHandles.AddRange(GetDataRowHandlesInGroup(rowHandle));
}
else
rowHandles.Add(rowHandle);
}
return rowHandles;
}

VB.NET

Private Function GetDataRowHandles() As List(Of Integer)
Dim rowHandles As List(Of Integer) = New List(Of Integer)()

For i As Integer = 0 To grid.VisibleRowCount - 1
Dim rowHandle As Integer = grid.GetRowHandleByVisibleIndex(i)

If grid.IsGroupRowHandle(rowHandle) Then

If Not grid.IsGroupRowExpanded(rowHandle) Then
rowHandles.AddRange(GetDataRowHandlesInGroup(rowHandle))
End If
Else
rowHandles.Add(rowHandle)
End If
Next

Return rowHandles
End Function

Private Function GetDataRowHandlesInGroup(ByVal groupRowHandle As Integer) As List(Of Integer)
Dim rowHandles As List(Of Integer) = New List(Of Integer)()

For i As Integer = 0 To grid.GetChildRowCount(groupRowHandle) - 1
Dim rowHandle As Integer = grid.GetChildRowHandle(groupRowHandle, i)

If grid.IsGroupRowHandle(rowHandle) Then
rowHandles.AddRange(GetDataRowHandlesInGroup(rowHandle))
Else
rowHandles.Add(rowHandle)
End If
Next

Return rowHandles
End Function

遍历单元格

DevExpress WPF GridControl通过行句柄和列对象定义单元格，要遍历单元格，扩展在遍历行部分中描述的技术，遍历GridControl.Columns或 GridViewBase.VisibleColumns / TreeListView.VisibleColumns集合来访问可见单元格：

C#

for (int i = 0; i < grid.VisibleRowCount; i++) {
int rowHandle = grid.GetRowHandleByVisibleIndex(i);
foreach (var column in grid.Columns) {
var cellValue = grid.GetCellValue(rowHandle, column);
}
}

VB.NET

For i As Integer = 0 To grid.VisibleRowCount - 1
Dim rowHandle As Integer = grid.GetRowHandleByVisibleIndex(i)

For Each column In grid.Columns
Dim cellValue = grid.GetCellValue(rowHandle, column)
Next
Next

要遍历所有bands中的列，请使用GridControl.Columns或GridViewBase.VisibleColumns集合。要遍历bands中的列，请从GridControl.Bands集合中获取并使用GridControlBand.Columns集合属性。

遍历节点

TreeListView将节点表示为行，您可以使用上面列出的技术来遍历可见节点及其单元。

在Master-Detail GridControl中遍历Detail行

GridControl包括以下类型的详细描述符：

• DataControlDetailDescriptor;
• ContentDetailDescriptor;
• TabViewDetailDescriptor.

注意：只有在展开主行时，详细GridControl才可用。

DataControlDetailDescriptor

要遍历详细行，需要访问详细GridControl的实例。使用在遍历行部分中描述的技术，并使用GridControl.IsMasterRowExpanded 方法来检查是否展开了主行。使用GridControl.GetDetail方法来获得扩展的GridControl详细，并遍历它的行：

C#

Dictionary<int, List<int>> master_detail = new Dictionary<int, List<int>>();

for (int i = 0; i < masterGridControl.VisibleRowCount; i++) {
int rowHandle = masterGridControl.GetRowHandleByVisibleIndex(i);
List<int> details = new List<int>();
master_detail[rowHandle] = details;
if (masterGridControl.IsMasterRowExpanded(rowHandle)) {
var detailGrid = masterGridControl.GetDetail(rowHandle) as GridControl;
for (int j = 0; j < detailGrid.VisibleRowCount; j++) {
int detailRowHandle = detailGrid.GetRowHandleByVisibleIndex(j);
details.Add(detailRowHandle);
}
}
}

VB.NET

Dim master_detail As Dictionary(Of Integer, List(Of Integer)) = New Dictionary(Of Integer, List(Of Integer))()

For i As Integer = 0 To masterGridControl.VisibleRowCount - 1
Dim rowHandle As Integer = masterGridControl.GetRowHandleByVisibleIndex(i)
Dim details As List(Of Integer) = New List(Of Integer)()
master_detail(rowHandle) = details

If masterGridControl.IsMasterRowExpanded(rowHandle) Then
Dim detailGrid = TryCast(masterGridControl.GetDetail(rowHandle), GridControl)

For j As Integer = 0 To detailGrid.VisibleRowCount - 1
Dim detailRowHandle As Integer = detailGrid.GetRowHandleByVisibleIndex(j)
details.Add(detailRowHandle)
Next
End If
Next

使用DataViewBaseFocusedView属性来访问焦点详细GridControl并遍历它的行：

C#

var focusedDetail = masterView.FocusedView as TableView;
if (focusedDetail != null) {
List<int> rowHandles = new List<int>();
for (int i = 0; i < focusedDetail.Grid.VisibleRowCount; i++) {
int rowHandle = focusedDetail.Grid.GetRowHandleByVisibleIndex(i);
rowHandles.Add(rowHandle);
}
}

VB.NET

Dim focusedDetail = TryCast(masterView.FocusedView, TableView)

If focusedDetail IsNot Nothing Then
Dim rowHandles As List(Of Integer) = New List(Of Integer)()

For i As Integer = 0 To focusedDetail.Grid.VisibleRowCount - 1
Dim rowHandle As Integer = focusedDetail.Grid.GetRowHandleByVisibleIndex(i)
rowHandles.Add(rowHandle)
Next
End If

ContentDetailDescriptor

在ContentDetailDescriptor中，您只能获得GridControl视图中可见的内容。

要遍历详细行，需要访问详细GridControl的实例。使用LayoutTreeHelper类迭代主GridControl的可视化树，并访问详细GridControl的行：

C#

var detailGrids = LayoutTreeHelper.GetVisualChildren(masterGridControl).OfType<GridControl>();

foreach(var detailGrid in detailGrids) {
List<int> rowHandles = new List<int>();
for (int i = 0; i < detailGrid.VisibleRowCount; i++) {
int rowHandle = detailGrid.GetRowHandleByVisibleIndex(i);
rowHandles.Add(rowHandle);
}
}

VB.NET

Dim detailGrids = LayoutTreeHelper.GetVisualChildren(masterGridControl).OfType(Of GridControl)()

For Each detailGrid In detailGrids
Dim rowHandles As List(Of Integer) = New List(Of Integer)()

For i As Integer = 0 To detailGrid.VisibleRowCount - 1
Dim rowHandle As Integer = detailGrid.GetRowHandleByVisibleIndex(i)
rowHandles.Add(rowHandle)
Next
Next

TabViewDetailDescriptor

TabViewDetailDescriptor在其选项卡中显示不同类型的详细信息（ContentDetailDescriptor和DataControlDetailDescriptor），GridControl只会为选中的选项卡创建一个可视元素。要遍历选项卡中的详细行，请使用详细描述符主题中描述的技术。

GridControl.GetDetail方法的重写接受DataControlDetailDescriptor对象，使用这个覆盖来获得 TabViewDetailDescriptor的标签中显示的GridControl：

XAML

<dxg:GridControl.DetailDescriptor>
<dxg:TabViewDetailDescriptor>
<dxg:DataControlDetailDescriptor x:Name="firstDetailDescriptor" ItemsSourceBinding="{Binding Data}">
<dxg:GridControl AutoGenerateColumns="AddNew" x:Name="detailGridControl">
<dxg:GridControl.View>
<dxg:TableView x:Name="detailView"/>
</dxg:GridControl.View>
</dxg:GridControl>
</dxg:DataControlDetailDescriptor>
</dxg:TabViewDetailDescriptor>
</dxg:GridControl.DetailDescriptor>

C#

Dictionary<int, List<int>> master_detail = new Dictionary<int, List<int>>();

for (int i = 0; i < masterGridControl.VisibleRowCount; i++) {

int rowHandle = masterGridControl.GetRowHandleByVisibleIndex(i);

List<int> details = new List<int>();
master_detail[rowHandle] = details;

if (masterGridControl.IsMasterRowExpanded(rowHandle)) {

var detailGrid = masterGridControl.GetDetail(rowHandle, firstDetailDescriptor) as GridControl;
if (detailGrid == null)
return;

for (int j = 0; j < detailGrid.VisibleRowCount; j++) {
int detailRowHandle = detailGrid.GetRowHandleByVisibleIndex(j);
details.Add(detailRowHandle);
}
}
}

VB.NET

Dim master_detail As Dictionary(Of Integer, List(Of Integer)) = New Dictionary(Of Integer, List(Of Integer))()

For i As Integer = 0 To masterGridControl.VisibleRowCount - 1
Dim rowHandle As Integer = masterGridControl.GetRowHandleByVisibleIndex(i)
Dim details As List(Of Integer) = New List(Of Integer)()
master_detail(rowHandle) = details

If masterGridControl.IsMasterRowExpanded(rowHandle) Then
Dim detailGrid = TryCast(masterGridControl.GetDetail(rowHandle, firstDetailDescriptor), GridControl)
If detailGrid Is Nothing Then Return

For j As Integer = 0 To detailGrid.VisibleRowCount - 1
Dim detailRowHandle As Integer = detailGrid.GetRowHandleByVisibleIndex(j)
details.Add(detailRowHandle)
Next
End If
Next

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