WPF的嵌套数据网格FindResource问题
本文关键字：网格 FindResource 问题 数据网 数据 嵌套 WPF | 更新日期: 2023-09-27 18:00:40
我对WPF中的嵌套数据网格有要求。显示消费者订单信息的父网格。当用户点击订单信息中的详细信息时，需要在订单信息的父行内的子数据网格（意味着嵌套网格）中显示订单项目的详细信息。为此，我使用<DataGrid.RowDetailsTemplate>来绑定子数据网格。我的XAML代码如下。
<Popup Name="popup1" IsOpen="False" Placement="Mouse" Height="500" Width="700">
<Border BorderBrush="Black" BorderThickness="1" Background="White">
<StackPanel Orientation="Horizontal">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
<DataGrid Grid.Row="0" Grid.Column="0" SelectedValuePath="orderid"
AutoGenerateColumns="False" Height="350"
HorizontalAlignment="Left" Margin="114,128,0,0" x:Name="gridOrder" VerticalAlignment="Top" Width="500">
<DataGrid.Columns>
<DataGridTemplateColumn Header="Order Status">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<Button Content="{Binding OrderStatus}" Click="EditButton_Click" />
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Header="Full Name" Binding="{Binding fullname}" />
<DataGridTextColumn Header="Order ID" Binding="{Binding orderid}" />
<DataGridTextColumn Header="Mobile" Binding="{Binding mobile}" />
<DataGridTextColumn Header="No. of Items" Binding="{Binding countofItems}" />
<DataGridTextColumn Header="Total Price" Binding="{Binding Total_Price}" />
<DataGridTextColumn Header="Order Status" Binding="{Binding OrderStatus}" />
</DataGrid.Columns>
<DataGrid.RowDetailsTemplate>
<DataTemplate>
<DataGrid x:Name="gridOrderDetails" AutoGenerateColumns="False"
Height="200" HorizontalAlignment="Left" Margin="121,132,0,0" VerticalAlignment="Top" Width="200">
<DataGrid.Columns>
<DataGridTextColumn Header="Item ID" Binding="{Binding itemid}" />
<DataGridTextColumn Header="Item Name" Binding="{Binding ItemName}" />
<DataGridTextColumn Header="Item No." Binding="{Binding ItemNo}" />
<DataGridTextColumn Header="Quantity" Binding="{Binding quantity}" />
<DataGridTextColumn Header="Comments" Binding="{Binding comments}" />
<DataGridTextColumn Header="Item Price" Binding="{Binding ItemPrice}" />
<DataGridTextColumn Header="Quantity" Binding="{Binding quantity}" />
</DataGrid.Columns>
</DataGrid>
</DataTemplate>
</DataGrid.RowDetailsTemplate>
</DataGrid>
<Button Content="Close" Grid.Row="1" Grid.Column="1" Click="PopUp_OK_Click"/>
</Grid>
</StackPanel>
</Border>
</Popup>
我的C#代码如下：
private void EditButton_Click(object sender, RoutedEventArgs e)
{
try
{
DBDataContext dbContext = new DBDataContext();
SP_Get_OrderItemResult orderRow = gridOrder.SelectedItem as SP_Get_OrderItemResult;
DataGrid grid = gridOrder.FindResource("gridOrderDetails") as DataGrid;
grid.ItemsSource = dbContext.SP_Get_ItemList(orderRow.orderid);
}
catch (Exception Ex)
{
MessageBox.Show(Ex.Message);
return;
}
}
我无法将gridOrder的订单ID传入FindResource（：gridOrderDetails"）.
DataGrid grid = gridOrder.FindResource("gridOrderDetails") as DataGrid;
在上一行获取错误，因为不是'ridOrderDetails'资源找到
这是因为gridOrderDetails不是资源。资源在资源字典中是这样定义的，gridOrderDetails只是Template中的一个控件。
试着使用回答这个问题的函数：
private void EditButton_Click(object sender, RoutedEventArgs e)
{
try
{
DBDataContext dbContext = new DBDataContext();
SP_Get_OrderItemResult orderRow = gridOrder.SelectedItem as SP_Get_OrderItemResult;
DataGrid grid = FindChild<DataGrid>(gridOrder, "gridOrderDetails");
grid.ItemsSource = dbContext.SP_Get_ItemList(orderRow.orderid);
}
catch (Exception Ex)
{
MessageBox.Show(Ex.Message);
return;
}
}
/// <summary>
/// Finds a Child of a given item in the visual tree.
/// </summary>
/// <param name="parent">A direct parent of the queried item.</param>
/// <typeparam name="T">The type of the queried item.</typeparam>
/// <param name="childName">x:Name or Name of child. </param>
/// <returns>The first parent item that matches the submitted type parameter.
/// If not matching item can be found,
/// a null parent is being returned.</returns>
public static T FindChild<T>(DependencyObject parent, string childName)
where T : DependencyObject
{
// Confirm parent and childName are valid.
if (parent == null) return null;
T foundChild = null;
int childrenCount = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < childrenCount; i++)
{
var child = VisualTreeHelper.GetChild(parent, i);
// If the child is not of the request child type child
T childType = child as T;
if (childType == null)
{
// recursively drill down the tree
foundChild = FindChild<T>(child, childName);
// If the child is found, break so we do not overwrite the found child.
if (foundChild != null) break;
}
else if (!string.IsNullOrEmpty(childName))
{
var frameworkElement = child as FrameworkElement;
// If the child's name is set for search
if (frameworkElement != null && frameworkElement.Name == childName)
{
// if the child's name is of the request name
foundChild = (T)child;
break;
}
}
else
{
// child element found.
foundChild = (T)child;
break;
}
}
return foundChild;
}