前段時間做WPF項目，需要改變DataGrid某一行的顏色、高度，以及某個單元格的顏色、單元格字體的顏色，自然就必需取到datagrid的一行和一行的單元格，網上也是搜索了好久才找到，記錄下來便于使用。
1、前臺WPF界面添加一個DataGrid控件，并添加兩列（便于編寫，達到目的即可）
<DataGrid AutoGenerateColumns="False" Height="642" HorizontalAlignment="Left" Margin="131,57,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="799" CanUserAddRows="True" LoadingRow="dataGrid1_LoadingRow" GridLinesVisibility="None"> <DataGrid.ColumnHeaderStyle > <Style TargetType="DataGridColumnHeader"> <Setter PRoperty="Height" Value="50"></Setter> </Style> </DataGrid.ColumnHeaderStyle> <DataGrid.Columns> <DataGridTextColumn Header="id" Binding="{Binding Path=id}" ElementStyle="{StaticResource dgCell}"></DataGridTextColumn> <DataGridTextColumn Header="name" Binding="{Binding Path=name}" ElementStyle="{StaticResource dgCell}"></DataGridTextColumn> </DataGrid.Columns> </DataGrid>
2、創建一個數據源并綁定，此處是創建一個datatable
DataTable dt = new DataTable(); dt.Columns.Add(new DataColumn("id", typeof(int))); dt.Columns.Add(new DataColumn("name", typeof(string))); for (int i = 0; i < 6; i++) { DataRow dr = dt.NewRow(); if (i == 3) { dr["id"] = DBNull.Value; dr["name"] = DBNull .Value ; dt.Rows.Add(dr); } else { dr["id"] = i; dr["name"] = "tom" + i.ToString(); dt.Rows.Add(dr); } } this.dataGrid1.CanUserAddRows = false; this.dataGrid1.ItemsSource = dt.DefaultView;
3、獲取單行
for (int i = 0; i < this.dataGrid1.Items.Count; i++) { DataRowView drv = dataGrid1.Items[i] as DataRowView; DataGridRow row = (DataGridRow)this.dataGrid1.ItemContainerGenerator.ContainerFromIndex(i); if (i == 2) { row.Height = 50; row.Background = new SolidColorBrush(Colors.Blue); drv["id"] = 333; } if (drv["id"] == DBNull.Value) { row.Background = new SolidColorBrush(Colors.Green); row.Height = 8; } }
4、獲取單元格
for (int i = 0; i < this.dataGrid1.Items.Count; i++) { DataRowView drv = dataGrid1.Items[i] as DataRowView; DataGridRow row = (DataGridRow)this.dataGrid1.ItemContainerGenerator.ContainerFromIndex(i);
if (i == 4) { DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row); DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(1); cell.Background = new SolidColorBrush(Colors.Red); } }
public static T GetVisualChild<T>(Visual parent) where T : Visual { T childContent = default(T); int numVisuals = VisualTreeHelper.GetChildrenCount(parent); for (int i = 0; i < numVisuals; i++) { Visual v = (Visual)VisualTreeHelper.GetChild(parent, i); childContent = v as T; if (childContent == null) { childContent = GetVisualChild<T>(v); } if (childContent != null) { break; } } return childContent; }
5、如果在項目中把創建數據源、綁定數據源、對datagrid進行操作（改變行的顏色、高度）都寫在一個事件中，其中在取datagrid的row時出現錯誤：未將對象引用設置到對象的實例。
解決的方法：
//創建數據源、綁定數據源
if (!Window.GetWindow(dataGrid1).IsVisible) { Window.GetWindow(dataGrid1).Show(); } dataGrid1.UpdateLayout();
//可以獲取某一行、某一行的單元格
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