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="" HorizontalAlignment="Left" Margin="131,57,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="" CanUserAddRows="True" LoadingRow="dataGrid1_LoadingRow" GridLinesVisibility="None">
<DataGrid.ColumnHeaderStyle >
<Style TargetType="DataGridColumnHeader">
<Setter Property="Height" Value=""></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 = ; i < ; i++)
{
DataRow dr = dt.NewRow();
if (i == )
{
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 = ; i < this.dataGrid1.Items.Count; i++)
{
DataRowView drv = dataGrid1.Items[i] as DataRowView;
DataGridRow row = (DataGridRow)this.dataGrid1.ItemContainerGenerator.ContainerFromIndex(i); if (i == )
{
row.Height = ;
row.Background = new SolidColorBrush(Colors.Blue);
drv["id"] = ;
} if (drv["id"] == DBNull.Value)
{
row.Background = new SolidColorBrush(Colors.Green);
row.Height = ;
}
}
4、获取单元格
for (int i = ; i < this.dataGrid1.Items.Count; i++)
{
DataRowView drv = dataGrid1.Items[i] as DataRowView;
DataGridRow row = (DataGridRow)this.dataGrid1.ItemContainerGenerator.ContainerFromIndex(i);
if (i == )
{
DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex();
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 = ; 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