C#listview选项的修改

/获取鼠标点击的项------API
        [DllImport("user32")]
        public static extern int GetScrollPos(int hwnd, int nBar);
        private TextBox txtInput;
        //获取点击项的位置
        private void lViewPersonWork_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            try
            {
                ListViewItem item = this.lViewPersonWork.GetItemAt(e.X, e.Y);
                //找到文本框
                Rectangle rect = item.GetBounds(ItemBoundsPortion.Entire);
                int StartX = rect.Left; //获取文本框位置的X坐标
                int ColumnIndex = 0;    //文本框的索引
                //获取列的索引
                //得到滑块的位置
                int pos = GetScrollPos(this.lViewPersonWork.Handle.ToInt32(), 0);
                foreach (ColumnHeader Column in lViewPersonWork.Columns)
                {
                    if (e.X + pos >= StartX + Column.Width)
                    {
                        StartX += Column.Width;
                        ColumnIndex += 1;
                    }
                }
                if (ColumnIndex < this.lViewPersonWork.Columns.Count - 1)
                {
                    return;
                }
                this.txtInput = new TextBox();
                //locate the txtinput and hide it. txtInput为TextBox
                this.txtInput.Parent = this.lViewPersonWork;
                //begin edit
                if (item != null)
                {
                    rect.X = StartX;
                    rect.Width = this.lViewPersonWork.Columns[ColumnIndex].Width; //得到长度和ListView的列的长度相同                    
                    this.txtInput.Bounds = rect;
                    this.txtInput.Multiline = true;
                    //显示文本框
                    this.txtInput.Text = item.SubItems[ColumnIndex].Text;
                    this.txtInput.Tag = item.SubItems[ColumnIndex];
                    this.txtInput.KeyPress += new KeyPressEventHandler(txtInput_KeyPress);
                    this.txtInput.Focus();
                }
            }
            catch (Exception ex)
            {
               
            }
        }
        //回车保存内容
        private void txtInput_KeyPress(object sender, KeyPressEventArgs e)
        {
            try
            {
                if ((int)e.KeyChar == 13)
                {
                    if (this.txtInput != null)
                    {
                        ListViewItem.ListViewSubItem lvst = (ListViewItem.ListViewSubItem)this.txtInput.Tag;
                        lvst.Text = this.txtInput.Text;
                        this.txtInput.Dispose();
                    }
                }
            }
            catch (Exception ex)
            {
                
            }
        }
        //释放文本框内容
        private void lViewPersonWork_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                if (this.txtInput != null)
                {
                    if (this.txtInput.Text.Length > 0)
                    {
                        ListViewItem.ListViewSubItem lvst = (ListViewItem.ListViewSubItem)this.txtInput.Tag;
                        lvst.Text = this.txtInput.Text;
                    }
                    this.txtInput.Dispose();
                }
            }
            catch (Exception ex)
            {
                
            }
        }