1.在專案中新增itemscontrol排序的類（可同時對多個條件進行分組排序）

備註：類引用的名稱空間

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

    /// <summary>
    /// 實現ItemsControl（如ListBox）的排序與分組
    /// </summary>
    public class SortAndGroupBehavior : Behavior<ItemsControl>
    {
        
 
/// <summary>
        /// 排序的屬性
        /// </summary>
        public string SortProperty { get; set; }

        /// <summary>
        /// 分組的屬性
        /// </summary>
        public string GroupProperty { get; set; }

        protected override void OnAttached()
        {
            base.OnAttached();

            
 
if (!string.IsNullOrEmpty(this.SortProperty))
            {
                var list = this.SortProperty.Split(',');
                for (int ii = 0; ii < list.Length; ii++)
                {
                    var str = list[ii];

                    if (string.IsNullOrEmpty(str))
                    {
                        
 
continue;
                    }

                    bool asc = true;
                    if (str.EndsWith(" asc", StringComparison.OrdinalIgnoreCase))
                    {
                        str = str.Substring(0, str.Length - 4);
                    }
                    else if (str.EndsWith(" desc", StringComparison.OrdinalIgnoreCase))
                    {
                        str = str.Substring(0, str.Length - 5);
                        asc = false;
                    }

                    this.AssociatedObject.Items.SortDescriptions.Add(new SortDescription(str, (asc ? ListSortDirection.Ascending : ListSortDirection.Descending)));
                }
            }

            if (!string.IsNullOrEmpty(this.GroupProperty))
            {
                var list = this.GroupProperty.Split(',');
                for (int ii = 0; ii < list.Length; ii++)
                {
                    var str = list[ii];

                    if (string.IsNullOrEmpty(str))
                    {
                        continue;
                    }

                    this.AssociatedObject.Items.GroupDescriptions.Add(new PropertyGroupDescription(str));
                }
            }
        }

        protected override void OnDetaching()
        {
            base.OnDetaching();
            this.AssociatedObject.Items.SortDescriptions.Clear();
            this.AssociatedObject.Items.GroupDescriptions.Clear();
        }
    }

2.在xaml進行呼叫，使用listview作為例子

         <ListView Margin="5" ItemsSource="{Binding PeopleList}">
            <i:Interaction.Behaviors>
                <local:SortAndGroupBehavior SortProperty="Age desc"/>
            </i:Interaction.Behaviors>
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="國籍" Width="150" DisplayMemberBinding="{Binding Nation}" />
                    <GridViewColumn Header="城市" Width="150" DisplayMemberBinding="{Binding City}" />
                    <GridViewColumn Header="姓名" Width="150" DisplayMemberBinding="{Binding Name}" />
                    <GridViewColumn Header="年齡" Width="150" DisplayMemberBinding="{Binding Age}" />
                </GridView>
            </ListView.View>
        </ListView>            

3.排序效果（根據年齡進行降序排列）