关于listview排序的问题

C# code

        #region 自定义变量
        int currentCol = -1;
        bool sort;
        #endregion

        private void listView1_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            #region       字符串加上小三角,TrimEnd的用法测试
            string Asc = ((char)0x25bc).ToString().PadLeft(4, ' ');
            string Des = ((char)0x25b2).ToString().PadLeft(4, ' ');
            #endregion


            if (sort == false)
            {
                sort = true;
                string oldStr = this.listView1.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
                this.listView1.Columns[e.Column].Text = oldStr + Des;
            }
            else if (sort == true)
            {
                sort = false;
                string oldStr = this.listView1.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
                this.listView1.Columns[e.Column].Text = oldStr + Asc;
            }

            listView1.ListViewItemSorter = new ListViewItemComparer(e.Column, sort);
            this.listView1.Sort();
            int rowCount = this.listView1.Items.Count;
            if (currentCol != -1)
            {
                for (int i = 0; i < rowCount; i++)
                {
                    this.listView1.Items[i].UseItemStyleForSubItems = false;
                    this.listView1.Items[i].SubItems[currentCol].BackColor = Color.White;

                    if (e.Column != currentCol)
                        this.listView1.Columns[currentCol].Text = this.listView1.Columns[currentCol].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
                }
            }

            for (int i = 0; i < rowCount; i++)
            {
                this.listView1.Items[i].UseItemStyleForSubItems = false;
                this.listView1.Items[i].SubItems[e.Column].BackColor = Color.WhiteSmoke;
                currentCol = e.Column;
            }
        }







        private void listView2_ColumnClick(object sender, ColumnClickEventArgs e)
        {
            #region       字符串加上小三角,TrimEnd的用法测试
            string Asc = ((char)0x25bc).ToString().PadLeft(4, ' ');
            string Des = ((char)0x25b2).ToString().PadLeft(4, ' ');
            #endregion


            if (sort == false)
            {
                sort = true;
                string oldStr = this.listView2.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
                this.listView2.Columns[e.Column].Text = oldStr + Des;
            }
            else if (sort == true)
            {
                sort = false;
                string oldStr = this.listView2.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
                this.listView2.Columns[e.Column].Text = oldStr + Asc;
            }

            listView2.ListViewItemSorter = new ListViewItemComparer(e.Column, sort);
            this.listView2.Sort();
            int rowCount = this.listView2.Items.Count;
            if (currentCol != -1)
            {
                for (int i = 0; i < rowCount; i++)
                {
                    this.listView2.Items[i].UseItemStyleForSubItems = false;
                    this.listView2.Items[i].SubItems[currentCol].BackColor = Color.White;

                    if (e.Column != currentCol)
                        this.listView2.Columns[currentCol].Text = this.listView2.Columns[currentCol].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
                }
            }

            for (int i = 0; i < rowCount; i++)
            {
                this.listView2.Items[i].UseItemStyleForSubItems = false;
                this.listView2.Items[i].SubItems[e.Column].BackColor = Color.WhiteSmoke;
                currentCol = e.Column;
            }
        }



















        public class ListViewItemComparer : IComparer
        {
            public bool sort_b;
            public SortOrder order = SortOrder.Ascending;

            private int col;

            public ListViewItemComparer()
            {
                col = 0;
            }

            public ListViewItemComparer(int column, bool sort)
            {
                col = column;
                sort_b = sort;
            }

            public int Compare(object x, object y)
            {
                if (sort_b)
                {
                    return String.Compare(((ListViewItem)x).SubItems[col].Text, ((ListViewItem)y).SubItems[col].Text);
                }
                else
                {
                    return String.Compare(((ListViewItem)y).SubItems[col].Text, ((ListViewItem)x).SubItems[col].Text);
                }
            }
        }

不知道为什么在我这里不起作用！会是哪里问题？

单步调试

if (sort == false)
  {
  sort = true;
  string oldStr = this.listView1.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
  this.listView1.Columns[e.Column].Text = oldStr + Des;
  }
  else if (sort == true)
  {
  sort = false;
  string oldStr = this.listView1.Columns[e.Column].Text.TrimEnd((char)0x25bc, (char)0x25b2, ' ');
  this.listView1.Columns[e.Column].Text = oldStr + Asc;
  }
这个判断语句==什么也没有做