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在本文中您將學習到DevExpress WPF Grid控件如何在網格視圖數據布局中遍歷代碼中的行和單元格，歡迎下載最新版組件體驗！

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本文演示如何逐個訪問數據項。

遍歷行

DevExpress WPF GridControl通過句柄或可見索引標識數據行，屬性返回可見組和數據行的總數。為了遍歷行，使用一個從0到屬性值的計數器。在這個代碼示例中，我們使用方法來獲取行句柄：

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

屬性不考慮：

• 折疊組中的行
• 用過濾器隱藏的行
• 服務行（自動篩選行、新建項行）
• 來自GridControls詳細的行

注意：當您在GridControl的底部顯示New Item Row時，屬性將其視為常規行。

要遍歷分組中的折疊行，請使用方法。此方法返回分組中當前行的計數。創建一個類似于前一個的計數器，并使用方法來獲取組中行的句柄，使用 方法檢查行是否為分組行。

下面的示例展示如何獲取視圖中所有數據行的句柄（包括折疊組中的行），除了被過濾掉的行：

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

遍歷單元格

DevExpress WPF GridControl通過行句柄和列對象定義單元格，要遍歷單元格，擴展在遍歷行部分中描述的技術，遍歷或 / 集合來訪問可見單元格：

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

要遍歷所有bands中的列，請使用或集合。要遍歷bands中的列，請從集合中獲取并使用集合屬性。

遍歷節點

TreeListView將節點表示為行，您可以使用上面列出的技術來遍歷可見節點及其單元。

在Master-Detail GridControl中遍歷Detail行

GridControl包括以下類型的詳細描述符：

• ;
• ;
• .

注意：只有在展開主行時，詳細GridControl才可用。

DataControlDetailDescriptor

要遍歷詳細行，需要訪問詳細GridControl的實例。使用在遍歷行部分中描述的技術，并使用 方法來檢查是否展開了主行。使用方法來獲得擴展的GridControl詳細，并遍歷它的行：

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屬性來訪問焦點詳細GridControl并遍歷它的行：

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

在中，您只能獲得GridControl視圖中可見的內容。

要遍歷詳細行，需要訪問詳細GridControl的實例。使用類迭代主GridControl的可視化樹，并訪問詳細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

在其選項卡中顯示不同類型的詳細信息（和），GridControl只會為選中的選項卡創建一個可視元素。要遍歷選項卡中的詳細行，請使用詳細描述符主題中描述的技術。

方法的重寫接受對象，使用這個覆蓋來獲得 的標簽中顯示的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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