前段时间做WPF项目,需要改变DataGrid某一行的颜色、高度,以及某个单元格的颜色、单元格字体的颜色,自然就必需取到datagrid的一行和一行的单元格,网上也是搜索了好久才找到,记录下来便于使用。
1、前台WPF界面添加一个DataGrid控件,并添加两列(便于编写,达到目的即可)
<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、创建一个数据源并绑定,此处是创建一个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、获取单行
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、获取单元格
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、如果在项目中把创建数据源、绑定数据源、对datagrid进行操作(改变行的颜色、高度)都写在一个事件中,其中在取datagrid的row时出现错误:未将对象引用设置到对象的实例。
解决的方法:
//创建数据源、绑定数据源
if (!Window.GetWindow(dataGrid1).IsVisible) { Window.GetWindow(dataGrid1).Show(); } dataGrid1.UpdateLayout();
//可以获取某一行、某一行的单元格
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