DevExpress WPF擁有120+個控件和庫，將幫助您交付滿足甚至超出企業(yè)需求的高性能業(yè)務應用程序。通過DevExpress WPF能創(chuàng)建有著強大互動功能的XAML基礎應用程序，這些應用程序專注于當代客戶的需求和構建未來新一代支持觸摸的解決方案。 無論是Office辦公軟件的衍伸產(chǎn)品，還是以數(shù)據(jù)為中心的商業(yè)智能產(chǎn)品，都能通過DevExpress WPF控件來實現(xiàn)。

在本文中您將學習到DevExpress WPF Grid控件如何在網(wǎng)格視圖數(shù)據(jù)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(shù)據(jù)項。

遍歷行

DevExpress WPF GridControl通過句柄或可見索引標識數(shù)據(jù)行，屬性返回可見組和數(shù)據(jù)行的總數(shù)。為了遍歷行，使用一個從0到屬性值的計數(shù)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(guī)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(shù)。創(chuàng)建一個類似于前一個的計數(shù)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(shù)據(jù)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(jié)點

TreeListView將節(jié)點表示為行，您可以使用上面列出的技術來遍歷可見節(jié)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(chuàng)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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