wpf以编程方式设置排序，以便将报头作为已排序的报头进行切换

I have a problem with a wpf toolkit DataGrid.

我对wpf工具箱DataGrid有一个问题。

I have an ItemsSource with three columns:

我有一个项目资源，有三个栏目:

FirstName

LastName

姓

Address

地址

In the C# codebehind I set the sort direction and which column to sort on like this:

在c# codebehind中，我设置了排序方向和要对哪个列进行排序:

ICollectionView view = CollectionViewSource.GetDefaultView(dataGrid1.ItemsSource);
view.SortDescriptions.Clear();
view.SortDescriptions.Add(new SortDescription("LastName", ListSortDirection.Ascending));
view.Refresh();

There is no problem in the actual sorting but there is in the headers visual style. If the user sorts a column by clicking on the header, the visual style changes, but the visual style does not indicate that the column sort description is set programmatically.

在实际的排序中没有问题，但是在header的视觉样式中有问题。如果用户通过单击标题对列进行排序，则视觉样式会发生变化，但视觉样式不会指示以编程方式设置列排序描述。

Why is this, and how can I toggle the header so it will show up as sorted?

为什么会这样，我怎么才能切换页眉让它显示为排序?

2 个解决方案

#1

I haven't tried it before, but I would think you could set the SortDirection property of the column.

我以前没有尝试过，但是我认为你可以设置列的SortDirection属性。

            int columnIndex = 0;
            this.dataGrid1.ColumnFromDisplayIndex(columnIndex).SortDirection = 
                ListSortDirection.Descending;

#2

Below sample will let you sort the data grid using the comboboxes as well as clicking directly on the datagrid.

下面的示例将允许您使用组合框对数据网格进行排序，并直接单击datagrid。

XAML:

<Window x:Class="DataGridDemo.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:Controls="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit"
    xmlns:System="clr-namespace:System;assembly=mscorlib"
    xmlns:ComponentModel="clr-namespace:System.ComponentModel;assembly=System"
    Height="300" Width="300">

    <Window.Resources>
        <ObjectDataProvider MethodName="GetValues" 
            ObjectType="{x:Type System:Enum}" 
            x:Key="SortDirections">
            <ObjectDataProvider.MethodParameters>
                <x:Type TypeName="ComponentModel:ListSortDirection" />
            </ObjectDataProvider.MethodParameters>
        </ObjectDataProvider>
    </Window.Resources>

    <StackPanel>
        <ComboBox 
            Name="_columnsComboBox"
            ItemsSource="{Binding Path=Columns, ElementName=_dataGrid}" 
            DisplayMemberPath="Header"
            SelectionChanged="OnSort" />
        <ComboBox 
            Name="_sortDirectionsComboBox"
            ItemsSource="{Binding Source={StaticResource SortDirections}}" 
            SelectionChanged="OnSort" />
        <Controls:DataGrid 
            Name="_dataGrid"
            ItemsSource="{Binding Path=PeopleData}" />

    </StackPanel>
</Window>

Code behind:

背后的代码:

using System;
using System.ComponentModel;
using System.Data;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using Microsoft.Windows.Controls;

namespace DataGridDemo
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            PeopleData = new DataTable();
            PeopleData.Columns.Add(new DataColumn("Name", typeof(string)));
            PeopleData.Columns.Add(new DataColumn("Age", typeof(int)));

            var row = PeopleData.NewRow();
            row["Name"] = "Sara";
            row["Age"] = 25;
            PeopleData.Rows.Add(row);

            row = PeopleData.NewRow();
            row["Name"] = "Bob";
            row["Age"] = 37;
            PeopleData.Rows.Add(row);

            row = PeopleData.NewRow();
            row["Name"] = "Joe";
            row["Age"] = 10;
            PeopleData.Rows.Add(row);

            DataContext = this;
        }

        public DataTable PeopleData { get; private set;}

        private void OnSort(object sender, SelectionChangedEventArgs e)
        {
            if (_sortDirectionsComboBox.SelectedIndex == -1 || _columnsComboBox.SelectedIndex == -1)
            {
                return;
            }

            foreach (DataGridColumn dataColumn in _dataGrid.Columns)
            {
                dataColumn.SortDirection = null;
            }

            ListSortDirection sortDescription = (ListSortDirection)(_sortDirectionsComboBox.SelectedItem);
            DataGridColumn selectedDataColumn = _columnsComboBox.SelectedItem as DataGridColumn;
            selectedDataColumn.SortDirection = sortDescription;

            ICollectionView view = CollectionViewSource.GetDefaultView(_dataGrid.ItemsSource);
            view.SortDescriptions.Clear();
            view.SortDescriptions.Add(new SortDescription(selectedDataColumn.Header as string, sortDescription));
            view.Refresh();
        }
    }
}

#1