lyfz_repos/铂金版源码/LYFZ.ComponentLibrary/ListViewColumnSorter.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace LYFZ.ComponentLibrary
{
    public class ListViewColumnSorter : IComparer
    {
        /// <summary>  
        /// 指定按照哪个列排序  
        /// </summary>  
        private int ColumnToSort;
        /// <summary>  
        /// 指定排序的方式  
        /// </summary>  
        private SortOrder OrderOfSort;
        /// <summary>  
        /// 声明CaseInsensitiveComparer类对象，  
        /// 参见ms-help://MS.VSCC.2003/MS.MSDNQTR.2003FEB.2052/cpref/html/frlrfSystemCollectionsCaseInsensitiveComparerClassTopic.htm  
        /// </summary>  
        private CaseInsensitiveComparer ObjectCompare;

        /// <summary>  
        /// 构造函数  
        /// </summary>  
        public ListViewColumnSorter()
        {
            // 默认按第一列排序  
            ColumnToSort = 0;
            // 排序方式为不排序  
            OrderOfSort = SortOrder.None;
            // 初始化CaseInsensitiveComparer类对象  
            ObjectCompare = new CaseInsensitiveComparer();
        }

        /// <summary>  
        /// 重写IComparer接口.  
        /// </summary>  
        /// <param name="x">要比较的第一个对象</param>  
        /// <param name="y">要比较的第二个对象</param>  
        /// <returns>比较的结果.如果相等返回0，如果x大于y返回1，如果x小于y返回-1</returns>  
        public int Compare(object x, object y)
        {
            int compareResult;
            ListViewItem listviewX, listviewY;
            // 将比较对象转换为ListViewItem对象  
            listviewX = (ListViewItem)x;
            listviewY = (ListViewItem)y;
            // 比较  
            if (LYFZ.Command.Command_Validate.IsNumeric(listviewX.SubItems[ColumnToSort].Text.Trim()) && LYFZ.Command.Command_Validate.IsNumeric(listviewY.SubItems[ColumnToSort].Text.Trim()))
            { compareResult = ObjectCompare.Compare(Convert.ToDecimal(listviewX.SubItems[ColumnToSort].Text.Trim()), Convert.ToDecimal(listviewY.SubItems[ColumnToSort].Text.Trim())); }
            else
            { compareResult = ObjectCompare.Compare(listviewX.SubItems[ColumnToSort].Text.Trim(), listviewY.SubItems[ColumnToSort].Text.Trim()); }
            // 根据上面的比较结果返回正确的比较结果  
            if (OrderOfSort == SortOrder.Ascending)
            {
                // 因为是正序排序，所以直接返回结果  
                return compareResult;
            }
            else if (OrderOfSort == SortOrder.Descending)
            {
                // 如果是反序排序，所以要取负值再返回  
                return (-compareResult);
            }
            else
            {
                // 如果相等返回0  
                return 0;
            }
        }

        /// <summary>  
        /// 获取或设置按照哪一列排序.  
        /// </summary>  
        public int SortColumn
        {
            set
            { ColumnToSort = value; }
            get
            { return ColumnToSort; }
        }

        /// <summary>  
        /// 获取或设置排序方式.  
        /// </summary>  
        public SortOrder Order
        {
            set
            { OrderOfSort = value; }
            get
            { return OrderOfSort; }
        }
    }
}